Service 4wd Tahoe Suburban Silverado My Fix-don’t throw parts at it-diagnose it
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- เผยแพร่เมื่อ 10 ส.ค. 2020
- My service 4wd issues and how I fixed it
Transfer Case Control Module
www.amazon.com/gp/product/B00...
Venom Power Tires
www.amazon.com/gp/product/B08...
transfer case fluid
www.amazon.com/gp/product/B00...
Mobile One Extended Performance 5w30
www.amazon.com/gp/product/B00...
Mobile One Extended Performance Oil Filter
www.amazon.com/gp/product/B00...
Rough Country Lift/Level Kit
www.amazon.com/gp/product/B07...
I found a loose wire where it plugs into the 4x4 actuator , it's one of the wires in the big deutsch connector ( or whatever it's called ) truck was 3 months old , I filled with dielectric grease after pinching the connection tighter , it made till recently. Its acting up again ..07 silverado 1/2 ton 4x4 over 300000 miles
It's good to hear fixes like this as it gives others another avenue if they tried everything in this video. I'll pin it.
I honestly have the same issue with my truck it's a GMC Yukon XL four-wheel drive
04 tahoe same deal. Park doesnt even work. Have to choc the tires to keep from rolling
Dielectric grease is not electrically conductive. You can't just fill connections with it. That's not how you use it.
2u
One thing I've noticed over the years... You can watch pretty much any video on TH-cam, scroll through the comments and see people arguing over the dumbest of crap. But when it comes to guys trying to get info on car repair, guys are helpful and willing to give real advice.
You've done a real terrific job explaining this in detail. You are certainly one of the few on the TH-cam that can explain things as well as you did. Keep up the good work. I appreciate your effort!
good job logically walking through the problem and fix. Subscribed!
MY GUY!! Thanks for this video you just save me. My truck got stuck on 4high when I was getting my boat out of the water . I look all over until I found your video disconnecting the baterry and pulling the fuse work for me. THANKS!
glad it helped
WOW...that is the EXACT problem I'm having. Been looking ALLL over for and answer and not qwite finding a fix or pretty much nothing. FINALLY I come across ur video and it's exactly the problem I'm having in the exact order as well. Hopefully this helps thank you!
DUDE THANK YOU SO MUCH. after putting in a brand new transfer case for 1500 she wouldn’t go into drive. Guess what. Your fuse TREC was blown like you suggested. Thanks a million.
glad it helped
Thank you. All we had to do for our situation was unplug the battery overnight and then the next day plug the battery back and it seems to be running good now. Time will tell if our issue is fixed. Thanks again for this video!
Glad it helped
I miss manual transfer cases and manual locking hubs! Good vid.
100% agree
I feel this, imma drive this piece of fucking shit off a cliff and go buy a 99.
I can't get mine to engage in 4wd and we got 12 inches of snow falling here in south dakota and we live 20 fucking miles down a dirt road.
@@halfassranch8363 sorry brother that sucks...sounds like you need a snow machine!
My 98 Tahoe push button 4x4 still works (knocking on wood....now) but I won't ever give up my 99 7.3 super duty...leaf springs and solid axles front and rear, manual hubs, manual transfer case, 6 sp manual transmission. Last of the real trucks..only thing it's missing is manual windows lol.
@@AZsmoothrider its all good, yeah next truck i buy is going to have locking hubs and the transfer case shifter on the floor.
I've never had one of my square bodies not engage. I ordered the switch for inside the dash and we'll see if that hail Mary does the trick. I'm hoping the switch intermittent fails.
@@halfassranch8363 there's a couple guys on here with videos converting their C/K trucks to manuals by removing actuator motor and installing an aftermarket choke cable kit to engage...I plan on doing this once mine fails.
Hey thanks for the video I’m having the same problem and I’m going to try that
My truck's been doing the exact same thing that you just explained in this video only ask for money at it and replaced a bunch of stuff and it still did it I'm going to try this I'll let you know how it works for me thank you
I am having same issue on my 05 burb. Going to replace tccm. Stuck in 4 low. The lights are still on and when I start the engine and I push 2 high the light on 2 high and 4 low stays on but still stuck in 4 low. Thank you for your video. Your video came up first when. I searched. Take care
Same symptoms. Something different to try..trec operates the front axle actuator. With truck off and in auto or 4X you can hear the actuator lock the front axles or unlock when you pull the fuse.
Thanks, I learned things I didn't know. I am currently stuck in 4wd lo
Try cleaning the ground screws located on frame on drivers side
Thanks for sharing bro. Dealing with the same issue now.
Hope it helped
I hope this works, I just purchased a 99 with 90k and I already have 1k in parts in it and I just replaced the encoder motor and the switch. I got 3 TCCM from the junk yard and I swapping them and same issue so I'm going to try these steps... Thanks wish me luck
great info and easy to understand
Thank you! Just saved my bacon. I turned on the truck like you said and pulled the fuse to the transfer case. Plugged it back in. Transfer case reset and I was able to press 2H and it switched back into 2wd. I guess I won't be switching to 4wd to avoid this issue again. Thank you again.
Glad it helped 👍
Finally someone with the exact same symptoms as me!!
Same problem here also
My issue ended up being the 4wd actuator and the 4wd fuse on the drivers side fuse box. There is a small black disk inside the actuator that I swapped out and haven’t had a problem since.
@@tylerstonto1626
Were you having the same symptoms this guy was talking about?
thanx bro you solving my truck problem it was trec fuse
Once a month I will put my truck in 4 on a straight line on my way home and lately it will stick in 4. I did notice that leaving it over night fixes the issue. I was also told that getting the module reflashed will fix the issue.
Excellent video. No BS.
Thanks for watching
thanks brother, life saver
Thanks for this video, I have 2006 Nissan armada and when jacked the truck up only the left rear driver tire was moving the rest of them were still with the 4x4 on. Do You have any Idea what is going on there. Thank You again!
Start with the fuses and then check the relays on the passenger side. If you have auto level you can swap the fuses. If that doesn’t help check for leaks on the differential and make sure the drive shafts are firmly seated as they can wear out and get pushed out almost a half inch causing similar issues. Hope this helps.
Also I noticed the stereo. I wanted to swap stereos. Plugged the new one in and wouldn't power up. Turned out to be new stereo. After directly testing it to battery. When I tested power it wasn't showing much voltage , nor the accessories wire. But the factory double din stereo worked no problem. Im hoping when I find whats causing lack of power to stereo it might be the reason my encoder motor isn't working. I've done all the things you tried. Except the plug in order and battery disconnect for more hours. Thank for video
Did you use a harness for your radio install? I had a cheaper one that gave me similar issues. I swapped to a Critchfield one and issues were gone. I honestly think these Chevy's around these years do have wiring issues in a lot cases. My issue has not come back but the chase down to find the original problem was not fun at all.
I'm having the same exact issue with a GMC Yukon XL four-wheel drive is having the same exact issue
So the 4x4 switch on my truck doesn’t light up at all only one that lights up is the 2high but the others don’t , any recommendations on what to do ? I’m thinking it could just be the switch but I’m not too sure , been going crazy about since it’s been almost a month since my truck started saying service 4wd
This happened to my truck yesterday, I was going to replace the tcase shifter motor but maybe I'll hold off and try resetting everything.
Yes try all the free stuff first.
yeah, thanks man, I was chastised bad as an elevator technician for being a parts chaNGER , SO TROUBLESHOOTING IS MY PRIORITY TOO! but a combination of both is real world reality, so much is needed to do point to point troubleshooting nowadays, swapping a part at no cost can be a time waster or it can fix something. overnight battery disconnect does help. POR it was called in the trade. Power On Reset! did hundreds or thousands of them for Otis elevator when the computer programs were developing!!
100% and if you really look at it I did both in this video so hopefully others had a way to start. Big thing is to start off free and work your way through it.
@@Alpha-Works-Tx yes, , this forum of helping each other is what i would label as smart and kind, what a society is supposed to be about, the etymology of society in french is like helpful and supportive, not competitive. Sometimes intuition can guide us as if it were magic, TOO!
Wondering if after removing battery , short the positive lead to ground thru a resistor. This might drain the charge much faster, and no more 5-6 hour wait. More like 10 minutes. I'm going to try it.
Did that work?
My 04 z71 Tahoe is doing the exact same thing. No lights on the selector switch and often times stuck in 4 low. Usually turning the truck off and on would work but still nothing. No lights on the switch but feels like it's in neutral or auto 4wd. Very frustrating. I will try what you did, hopefully I have some luck. Thank you!
It's frustrating for sure but try the free stuff and work your way onto the other stuff.
Thanks. This almost got me fixed. It switches into everything but 4L now. The weird thing is that it went into 4L (by itself) yesterday before I reset the TCCM.
Yea going into 4L by itself is typically the TCCM acting up
Put it in neutral
@@bthayer7797 At the end of the day it ended up being the transfer case. It works fine after replacing it.
@@jtoddhayes1i have the same problem. I have a suburban 2011 and sometimes it turns to 4L by itself without me touching it. Can you help me what is the problem and/or how can i fix it?
Thanks in advance
@@theleader5001 I think my issue wasn't fixed until I replaced the transfer case.
2000 sierra 2500 I don't see the trec fuse ,help please, I did clean the ground under truck ,replace the awd fuse inside ,and nothing, my problem is front tires won't move in hi or low
Had my 01 tahoe in 4low and I turned engine off and back on today and now I only have two wheel drive that is geared like 4low and the service 4x4 light is on. Does anyone know what would cause the problem?
Where did you get your woodgrain dash face??
Hi
Having the same problem. I changed the switch and front actuator still no lights on the switch and won't shift to 4 wheel. Also reading abs disabled any suggestions?
Hello, if the grounds have been cleaned and you have tried a battery reset, the next step would be transfer case control module. A lot of the people I have spoke with through the comments and also my personal issues with my truck have been resolved by changing the TCCM out.
My truck is a 99 Silverado 1500 and it won’t go back to 2WD. When I press 2HI it flashes then goes back to 4HI. I ordered a new switch button panel but idk if that could be the problem
I got a 04 4-door Z71 yesterday the guy said the four-wheel drive works he bought a new push button for it because the old one just said it was in neutral but clearly it was in two-wheel drive. I got home with the truck last night put the new button in soon as I plugged it up it flashed for low in the truck is stuck in four low. I was trying to see if it had a manual disengage on the transmission or transfer case like my older Z71 but it does not I just watched your video and pulled that 30 amp fuse in the front wheels aren't spinning anymore I have the truck on the lift. I just want to know if pulling that fuse actually disengages the four-wheel drive because I don't want to tear up the front end trying to drive it to work tomorrow
If you drive it you will know if it’s in 4wd vs 2wd. Pulling the fuse usually does the trick. I would check the grounds and disconnect the battery to reset everything.
Thank you so much for the video I had the same situation in my 05 Tahoe 5.3 (in case anyone else finds that helpful). Except my lights on the 4wd switch went out completely while driving I kind of expected that needed replacing. But my dash also kept telling me to service 4wd and stability disabled with the damn dummy light up top as well. As far as the transfer case...I could only be sure it wasn't in low bc it ran like it somehow went to 2. I was so worried about my poor "fat ass" Tahoe I spent all night on the internet. But I just went ahead and did both the switch and the TCCM. My TCCM was 318$ at Orileys (Nevada in case thats helpful) with core charge of 192$ and the 4wd switch was I think 55$. It was difficult to get the damn plugs of out the tccm but putting it back was easy. Be sure the 4 pin goes in last like the fellow mentioned in his video :). It said so on a sticker on the actual part in my case though. A little tip I've found super helpful is a good old fashioned Hanes book it helps to referenceall these videos found online. I might not have needed the TCCM. I never bothered to go have any code read. I was sure I wasn't lucky enough to spend only 55$. I hope yall don't need to do the TCCM. Also I only waited maybe 45 mins before hooking up the battery after I put the new TCCM in. And everything was GTG. Good luck Tahoe drivers.
Thanks for the feedback for others to check and glad it helped.
Im definitely gonna try this when i get back to my truck and see if i can pull the fuse and get it home so i can get it fixed i order the buttons for it but yes turn on truck no lights on it hopefully bad switch but sounds like mine would hate to drop 200 on a TCCM but hey it is what it is i tried going under driver side and cleaned grown cables still nothing
You could always grab a junkyard TCCM for 5 bucks as well if you have a parts yard near you
@@Alpha-Works-Tx thats a great idea i will check that one for sure never thought of that
I've been trying to figure out a similar problem. I bought a used t-case module today and it didn't fix the problem. I didn't detach the battery, and I don't know what order I plugged it in, but I'll try this anyway.
This problem sucks because it seems that everyone has the problem but all fixes are one of the many I have went over or others have added. It’s a frustrating issue for sure.
Thanks for the video bro
Dude! Great info ! By the way i have the same burlwood trim on my dash but its faded, any idea where i can get a replacement because i can't find it anywhere..thanks!
Junk yards have the best prices but also check out eBay
Try using graphics wrap type material. It comes in so many patterns
Hey i'm having similar problems just wondering I know you said the 4 pin plug goes last when plugging in tccm but does it matter about the other 2 plugs or do they have to be put in a certain order ?
Just seen your other comment thanks for video
Nope other 2 can go either way
So I replaced my encoder motor for the tcase a month ago everything was working fine and then it start acting up again where it would go into 4H and then within a few minutes 4x4 wasnt working but it would say its still in 4H and now it dont even want to go into 4H but itll go into 4L no problem. Got any suggestions?
What brand encoder did you get? I’ve seen a lot of guys get some parts that only last a month or two can cause new issues. Honestly if I had a junk yard close to me I woulda pulled a TCCM out of that for only 10 bucks but electronics on these gm’s are finicky to say the least.
My switch has lights for a couple seconds and then nothing. Does anyone know what I should try next? I tried the reset with the under hood fuses. I also cleaned the grounds on the frame.
Do you have social media to send you videos of what mine is going ? I’m trying my best to do this but I’m having trouble comprehending
That's weird, usually its just the switch and its a 5 minute replacement. The usual suspects are the 4wd switch, blower motor control module, instrument cluster and oil pressure switch and im probably forgetting a few ive already replaced. Its worth it though, I love my 05 GMC
So funny, same here with all the minor issues. But I'm about 99% sure that it's my TCCM. And I love my old 06 Silverado. Wife keeps telling me to trade it in for something new... No thanks.
My gmc yukon 2004 the 4wd switch has no lights and will not shift to any other I am hoping 🙏 it's only a fuse
my 07 chevy suburban had the same problem i just updated the software in it and it’s running perfect it had old software in from 2007 now it hads 2023 new software
Did you need to go to the dealer, or will non-GM scanners work?
Good video! I’m having the same problem with my 2006 Tahoe and my fan also stays on unless I unplug the fuse! How can I fix this ?
That could be a bad relay or what it was in my case it was the ecm. Don't waste money trying to find a used one for the same year range just pay the 150 bucks and order one set to your vehicles vin number. Also if you have a factory radio it will lock it when it's changed out. I've been told dealers have to be the ones to unlock it but I think it's cheaper to buy a aftermarket one. Hope this helps.
Check your ecm in the box next to your battery. I had the same problem with the fan running and the ecm had corrosion on it. Replace it and problem solved.
Idk if that's what's going on with my 07 suburban but the light is no longer on. So idk if it's in auto,2,or 4. But when I try n turn the wheel left or right it make an awful sound like something is gonna snap and it feels like my tire is rubbing something that won't let the truck move hardly. Could this he the issue???
The sound and rubbing feel as well as something feels like it’s going to snap sounds like when my wheel bearing was going out. You would know if it’s in 4 whee drive as you would feel it when trying to drive fast. Have you tried any of the free steps such as battery reset and cleaning the grounds? Only thing I can recommend is to lift the front up and place it on jack stands so you can try and determine what the issue is or have someone look at it.
I pulled the fuse under the hood an it reset the switches in the dash but when I pressed the 4 low to put it in 4 wheel drive then gave the tahoe gas it started making like a clicking or pooping noise on left side and the 4x4 wasn't pulling I dunno wats going on ilthe 4x4 worked I parked it for maybe a year an now I can't get it to do no more than what it's doing now an Idomt have the money to just throw parts at it if u have a idea of what the issue may be I'd greatly appreciate it!!!
Try disconnecting the battery for a couple hours. While that’s disconnected check all fuses and clean the ground under the drivers side. Check your transfer case fluid as well and when your shifting the transfer case you are in neutral right?
Thanks real helpful
If anybody can help on here I have no lights to my 2hi 4hi 4low I’ll check the fuses. It comes on every time it rains at all and I can’t figure out why I’ve clean the grounds changed the 4x4. I guess the next thing to do is change the actuator but I’m still wondering if I’ll get lights back to my 4x4my buttons
Got a question not pertaining to the video. What kind of touchscreen audio player do you have in your truck? I'm looking to converting mine.
It’s a JVC KW-V218T
Thank you!
2003 Suburban Z71. My switch would light on but the indicator Orange light would not come on. I know my car was stuck on 2. I saw this video and I pulled the 30 fuse under the hood while the ignition was on. I then put the fuse back in and my indicator Orange light came back on 2. Why would this happen because the fuse is still good? Thanks for the video. My 03 suburban is back to normal.
These 4wd systems are finicky and the older they get the more issues electronics and wiring will have. You probably just reset since you pulled the fuse for the middle of the system.
I have an 07 Suburban with the service 4x4 light. What year is your truck?
Thank you!
2004
I have a 05 chevy Silverado and my four wheel drive keeps engaging itself. Which is weird because I have to manually put it in four wheel drive. What can this possibly be? Transfer case maybe?
I have the same problem, my 4 wheel drive sometimes engaging by itself? Did you get it fix? Can you help what is the problem and how you fix it?
Thanks
I’m having an issue where my 05 Tahoe, the auto 4wd and 2wheel drive lights are on. Replaced the actuator no change. Cleaned the ground and nothing. Also In the engine bay testing the connector that goes to the actuator only 1 pin out of the 4 has power to it.
Sounds like the TCCM
I’m having trouble with mine and my light on the switch won’t come on don’t no what it is I check the fuse and everything
My switch for the 2hi ,4hi,4low have no lights at all and i can't switch it to 4x4 any idea what that could be?
Typically these symptoms lead to the TCCM being bad. Checking the free stuff and also your transfer case harness doesn’t hurt either some have found that the connectors at the transfer case were wet.
I have the same issue with 2004 suburban. I did buy a rebuilt transfer case actuator but my mechanic said it was a bad tccm since his snap on scanner could not communicate with the transfer case. I spent $230 for a Cardone rebuilt tccm. After installing he was able to send commands to the transfer case and get it to shift through all settings with the old transfer case actuator. But still no shift from the dashboard controls. The switch does now light up and sequence when the truck is started. So the new tccm did improve the problem but not fix it. I did get a new switch today but it didn't help. I returned the transfer case actuator to Amazon and will send back the switch too. I did insure that the 4 pin connector was plugged in last but I didn't leave the battery disconnected for awhile like you said. I'll try tomorrow. But other than that I have no idea and my mechanic is stumped too.
Try resetting the battery and cleaning the grounds as well as ensuring the harness to the transfer case is clean, not wet, and not corroded. It sounds like your close to solving your issue.
@@Alpha-Works-Tx when you say reset the battery, you're saying to disconnect it for a few hours to give the system time to clear?
My mechanic said he tested and checked the wiring for continuity and ground and he says it all looks good. He wants to call a guy with a GM Scanner to reprogram the TCCM but Dorman says their units are pre programed. I'm curious about the ground you jumpered. I want to try that but we have a hurricane happening here on Long Island today so it has to wait.
@@Alpha-Works-Tx also, I cleaned the grounds under the driver side first. They needed a good cleaning but one of the 2 grounds has a stripped hole so I coupled them on one bolt. Could that cause a problem?
@@AmatuerOasis yea just disconnect both sides pos and neg and let it sit for a couple hours. As long as the ground is grounded it shouldn’t be a issue. Stay safe up there.
I have replaced everything, and even did an extra ground wire as instructed from video ...still NOTHING except its stuck in Neutral and wont shift with neutral light on!! VERY FRUSTRATED !!! hope THIS TRICK WORKS , and 2 modules, been thru 3 Moters, 3 switches ...Hope it works .... would appreciate any advice...
I have service 4wd message on my dash truck is in 2wd been like that for a while but today it was in Netural I pulled the trec fuse it’s back in 2wd what should I change the switch or the module
That is most likely a ground or the TCCM. You can grab a TCCM for 5-10 bucks at a junk yrd.
@@Alpha-Works-Tx I’m gonna clean the ground tomorrow I just let it reset by unhook both battery terminals and let it set for a hour
06 tahoe with new actuator, I have done the fuse reset under the hood, 4x4 fuse inside is good, start the vehicle and it always starts out in 4hi, won't go into 2wd or 4lo but you can hear the actuator trying and can only drive it in auto4x4. Does that sound like a tccm issue?
Take out the TCCM and check the connectors if possible swap it out with a junk yard one.
@@Alpha-Works-Tx appreciate it, been having this issue in my wife's tahoe for almost a year, don't want to damage anything with it only being drivable in auto 4x4, but thankful it will at least do the auto over 4hi.
@@andrewsavage1872 did u find out what was wrong with it? I have a similar problem
Well I tried all this as well and I still don’t even have lights except once in a while and the other day sitting in the drive through it lit up and would go into 4 hi and back into two hi and then nothing
Did you check the harness to the transfer case by chance? A lot of people have had issues with water in the loom and plug.
My truck threw a code U1026 for atc/Trans no communication and it makes some of the gauges stop working the ac stop blowing cool and the radio will also get quiter it does this for like 4-5 seconds then goes back to normal and then does it again. Only when driving though. Doesn't do it unless there's wheel speed. I tried a tccm and installed it the way you did but did not disconnect the battery before doing so. Makes me wonder if that'd fix it.
Your issue makes me wonder if there is corrosion in the harness for either the transfer case or transmission. Are you in a place that rains a lot or has snow? A lot of people have seen the looms and connector clips holding water.
@@Alpha-Works-Tx Yes to both of those. Funny you say that it seems to go away if I go through a car wash or in the rain the problem seems to go away for awhile.
@@cv8metal884 that’s odd lol I would still check them as it’s usually a free fix for most.
@@Alpha-Works-Tx just check the harness and plugs going to the tc and Trans?
@@cv8metal884 yes some have found water in the looms and plugs causing the 4wd system and other electronics to work on and off.
Ok. Found this from the other video I commented on. Symptoms are similar BUT I’m not getting an engine code like you did. I just get the service 4wd msg. But no code associated to the 4wd or transfer case module. Any experience with that? Or any insight..?
Lots of people have similar issues with no codes and it leads to TCCM or wiring at the transfer case. For the wiring just unplug and look at it make sure it’s not wet or corroded.
@@Alpha-Works-Tx what if it is wet? Is there anyway to fix
@@elireynolds7131 air hose and let it dry out.
@@Alpha-Works-Tx now it's saying I'm in 4 hi and 2 hi but it's in 4 hi and won't switch to anything else
Yeah my transfer case module is stuck in 4HI when I get up to 3rd gear feels like the axles locking up any suggestions
Check the transfer case for cracks or leaks. Also make sure the fluid is at the correct fill.
The mechanic was saying it’s the motor in the transfer case and the actuator in the front axle I just rebuilt the transmission a month ago
My lights from the 4x4 switch doesn't work what can it be? Anyone know what it can be
Check the free stuff like fuses and grounds. If that doesn’t work get a junk yard switch and TCCM for 10 bucks.
I have a 2008 Chevy suburban and it's stuck in 4 wheel drive and it's not switching gears at all I can't drive my truck in 4 wheel drive what can I do to fix this problem? please help
Try the free stuff first and work off of that. It usually comes down to process of elimination.
I'm in the same situation you where in. Could please send me the exact order of installing the tccm? Which plugs go on first? Do I disconnect the battery first? How long before I reconnect it? Etc?
Going crazy. Thanks Mark
4 pin goes last
@@justingonzalez702 so you can plug the other big connectors into the module in any order as long as the 4 pin is last?
Was it not shifting
Because my truck will NOT go into 3rd and the speedometer don't work
Was yours doing this?
That sounds more like a transmission problem, but check your transfer case and make sure it is not cracked and leaking. I had to get a transfer case saver cover when mine cracked and it was around the time I was having transmission issues as well.
Thank you
Glad it helped
Can you pull the trec fuse to disable the 4x4 and just drive it that way?
It would for me before but another time it didn’t. Try removing it and you will be able to tell when driving if it’s in 2wd only.
If its in 4 weel drive YES !
I forgot to add I did clean the grounds under the drivers seat...they were a little corroded but it made no change after i cleaned them
Still good? I’m having the same issue I switched the switch out today no changes. I’m going to clean the grounds on the frame below the drivers seat
PlayaMadeMeskin1 still good so far
Great video! Question: Did the old selector switch have light when turning on the ignition?
It did sometimes, but not every time. The problem with the service 4wd issues is alot of the time it's intermittent which makes it hard to diagnose.
@@Alpha-Works-Tx I have one more question....you were explaining how to reinstall the TCCM, but the video skipped. My TCCCM has Three Ports (Black, Gray, Black). Which Plug/Port do I insert first? Btw, I've visited many GM forms on this issue, but none seem to explain it. Thanks in advance.
@@kmesse1784 4 pin connector is last the other 2 plugs it's doesn't matter if they are 1st or 2nd.
@@Alpha-Works-Tx Got it! Thanks TR.
I put all after market parts in my 09 sierra even had tccm flashe still 4wd not working going to unplug battery leave it set for a day I didn't no you had to plug a certain qay
I have zero lights on except for when I turn the key on. No 2 wheel, no 4 wheel, nothing but I have cleaned grounds, I have changed the motor on the transfer case, I bought a new switch, I've unplugged it from the battery. Still no lights in the switch. ???
Thx bro.got my 2008 in 2wd still can’t switch it in and out of 4wd but at least it’s in 2wd so I can drive it
Pulling the trec fuse while its running for 30 seconds has been working for me for now, but soon i know i will have to replace the tccm. Im having the exact symptoms that you spoke of, very irritating.
The switch on my truck sometimes won’t be lit to show what mode it’s in. My display does say service 4wd. Should I try tccm? My 4wd works and I have not cared to diag the truck but I think I may restore it so I’m trying to figure what costs will be. Great info btw
Lights not coming on sometimes was one of the symptoms my truck had before the issues got worse. TCCM was my fix but my issues also got a lot worse before doing it. The TCCM was around 220 dollars if I remember right.
@@Alpha-Works-Tx thanks for the great info!
Is tccm main computer or another smaller one
@@wildbill5764 it was the switch. Defective ac delco. Bought a smp and works mint
My ram 1500, 08 has started trying to go in by itself. Today walked up to it and unlocked truck with key button and transfer case switch started running, key on my hand. When it stopped I could push unlock button on key and it try again. What the hell happening??
If i pull the 4x4 fuse inside the cab and just barely put it back in so it makes contact then wiggle it up and down my push button clicks And flickers for a second .Not sure what the problem is my truck was stuck in 4x4 high had to pull drive shaft
Sounds like a bad connection or possibly some corrosion. Have you checked the grounds?
@@Alpha-Works-Tx i had a shop look at it and they couldn’t fix it . i just so happen the be putting the 15 amp fuse back in and as soon as the fuse made contact with the two pins on fuse panel it clicked and all the lights on the switch flicker for a second
@@classicxl mine was real finicky until I replaced the module. Not sure what all you have tried so far though.
im having the same thing but i replaced everything tranfercase motor, module under the dash, and new button's worked for a week . mybe the ground under the frt left wheel. i dont know this suck's.
any help would be great. sorry it's a 2003 chevy tahoe 4x4 5.3 flex .
How’s your transfer case harness look? clean? That and check the grounds for sure, sounds like you have covered everything else
thank going in to the shop every thing replaced ............... well ne w they say.
@@Alpha-Works-Tx
Does this also cover when you turn the vehicle on and the transfer case is in a different position?
My new to me '04, Z71, Burb switched on it's own, no engine crank sometimes, door locks acting up and check engine light was always on too. The single black/white stripe ground wire at the rear of pass. head had a weak connection. Added enough wire to attach it to the firewall ground stud on drivers side that has braided strap to engine rear. Fixed all the problems. Also clean grounds on frame below drivers seat and ground on frame below core support, drivers side. Bad grounds cause lots of problems.
@@jefffrayer8238i have 2011 suburban and sometimes 4 wheel drive turns on suddenly by itself without me touching it, i had to put it back to 2 wheel drive and it worked going back. But why the 4 wheel drive turns on ? It happens to me several times, can you help me what is the problem and how i fix it
Thanks
@@theleader5001 Componets do go bad but at least with my generation truck I would clean the grounds first. Many have fixed their problems including Limp Mode by simply cleaning the grounds. A weak ground can cause a ton of hard and intermittent problems. Sometimes it's hidden as under the drivers seat there is 2 wires in 1 eyelet but if you don't push plastic conduit back you wouldn't see the second wire broke off. I didn't need it but my mechanic can look it up and tell me where all the grounds are located and I'd slip him a $20. That ground wire fixed all my problems but now I need to do an overhaul. Hope this helps.
Did you have to program the TCC module or plug and play
Plug and play
Did you say you had the truck running when you pull fuse?.
Yes
My 2004 chevy suburban says service 4wd on cluster I cleaned the grounds under driver door on frame and it's still on the buttons when pushing to try engage just blink on and off any clues
William villa can you hear the transfer case motor trying to shift when pressing buttons or is it quiet?
@@Alpha-Works-Tx no it just blinks
Sounds like there is no communication between the switch and the motor that means it could be the module or the transfer case actuator motor. Have you checked the under hood fuse or side panel fuse?
@@Alpha-Works-Tx not yet I did not realize that until watching your video thanks for the help
Also after you check remove the battery cables and let the truck sit for a couple hours. That will give it time to reset and possibly communicate.
My 02 silverado Is stuck in 4hi it will go only in 4 auto or hi. Ive changed the Switch, front actuator & transfer case motor twice & it did fix my service 4wd light until I went & put it back in 4wd then it got stuck again & wont come out???
Did you change the transfer case control module? Also what brand motor did you get? Battery reset? These chevys seem to be prone to these issues
@@Alpha-Works-Tx Im going to change the tccm this weekend. I replaced them with oem parts & manually put the transfer case in 2 hi before installing the new transfer case motors. It fixed my problem until I went & put it in 4wd now it sounds like its trying to change but wont the 2 hi light just flashes then it goes back to 4 hi
@@lorenzaramos8493 similar to what mine was doing and it was fixed by the module
@@Alpha-Works-Tx Just changed the Tccm trucks Back to normal 🤙
@@lorenzaramos8493 great news and glad to hear you got it worked out
Would a scrap truck of the same year and model TCCM work or would it have to be flashed?
Plug and play
@@Alpha-Works-Tx i had the original flashed nothing changed. If you would read my backstory to help me diagnose I'd really appreciate it.
The truck is an 07 Sierra. It's said service 4WD for about 10 years. Only in the last few years has it complete shit the bed. You used to have to switch back and forth on the dial. Go into reverse and drive and it would switch. One day it got stuck in 4WD and I needed it thrown on a lift to pound through the gears and switch the dial between Drive and reverse.
Sometimes the light on the dial would be on others it wouldn't. It's usually always on now but only for 2WD and no light changes if you switch it.
I've had the original TCCM swapped myself from a scrap truck. Nothing changed.
I've swapped the Encoder Motor. Nothing changed.
Currently before I have my appointment for repair I'm trying your method leaving the battery unplugged for a prolonged period and I'll try both TCCM'S.
I'm not sure if it's a single variable trial since the 2nd TCCM isn't flashed so it doesn't prove that isn't the issue unless someone can tell me that it doesn't need to be flashed to work in another vehicle.
Unless you're method works a small town garage told me the TCCM is almost never the issue it's an encoder motor and usually if that isn't it then there's an electrical issue
Currently my vehicle is rusted out and I'm welding on the frame just to keep it inspected until I can afford another. I can't pay $1000 to try parts.
@mail-qh2qc they are correct on the encoder as usually after time it rust and locks up. Wiring could be the issue since you live up north most likely. Wouldn't hurt to clean the grounds and clean up all wiring points as they may be dirty, rusty, or just damaged. A lot of stuff is free to try like disconnecting the battery, pulling the trec fuse, and cleaning up harnesses and wiring. That what I would do and also make sure you plug the TCCM in the correct order when installing as this does make a difference. Hope this helps.
@@Alpha-Works-Tx I let it sit overnight with the battery unplugged and tried the other TCCM.
At first the light flashed on auto and nothing happened. I turned off the vehicle and tried again 20 minutes later.
Now it works. Not bad for a $25 TCCM.
Thanks for the help.
@@mail-qh2qc glad you got it back up
Mine won't light up and do anything I changed the switch still nothing cleaned my ground still nothibg u think this is my problem I got a 2000silverado
My truck won’t go into 4hi. I press the button and it blinks and goes into Auto 4wd. 4low engages fine and goes back into 2wd fine. Any idea guys?
Does the light flash and try to go into 4hi? Your the first one I’ve heard that all other functions but one.
@@Alpha-Works-Tx yeah it flashes for like 3 seconds then it goes into Auto 4wd
My 03 Tahoe just said 4wd service. It's still drive able. But I kinda don't want to push my luck on it. I'm nervous though I had plans on making a trip and idk what to do. It's still in 2 but there's no lights on the switch
I drove for over 3 years before it left me stuck. This is a very common problem on these models and it seems there is no one answer for all yet. I did it steps to ensure I found the part that was messed up but I would always start with the grounds since it is the free fix if it works
@@Alpha-Works-Tx I think I'll check that out in the morning. Plus idk if it has to do with it but now my heater doesn't work
I think the heater is prob unrelated as usually it’s the vent door that switches back and forth for heat and cooling. I had that problem as well and it was solved by removing the battery cables and letting the truck drain...doing this might solve both issues
@@Alpha-Works-Tx a'ight cool I think I'll have to try this in the morning
@@Alpha-Works-Tx no I meant that as that service 4wd popped up. Last night when just before I wrote you, I was in town and I tried turning it on for my mom but it just ended up blowing cold air out
Mines frustrating the piss outta me. It randomly kicks into 4 low. Sometimes the nuetral light is on. Sometimes 2w and 4w on at the same time. It always seems to go back to 2 wheel after i cycle the ignition. Not sure what to do with it.
Two things that may help with this. One is the grounds and two unplug and clean both sides of every connector with a spray for electronics for the 4wd system from the switch to the transfer case motor.
I know it may be more work but it seems that overtime these connectors get gummed and crapped up.
I have the same problem, my suburban sometimes turns to 4 wheel drive suddenly by itself. How you fixed it?
Thanks
@@theleader5001 you can diagnose the switch pretty easily. Mine ended up being the shift motor on side of the transfer case.
What's the switch flashing on as soon as you turned it to position two?
The red seat belt light flashing?
Unless your asking about the selector switch which flashes all lights then shows which mode the transfer case is in.
Was* and I meant all the lights on the selector switch
Yes the switch does a cycle then stops on the mode it is in. When I had issues with the tcm it only cycled the lights sometimes and other times it did not work at all.
@@Alpha-Works-Tx cool, will try the few hrs reset
Yo I have that issue taking steps now
My truck is having this same issue. I've been without my truck for 2 weeks.
Did you have to have the TCCM programed?
Nope they work straight out of the box
@@Alpha-Works-Tx Thanks
Any updates? I’m going through the same issues
Mine is still working good from the TCCM fix.
I also did a update video with the 3 most asked questions that might help.