GOOD VIDEO MAN. I want to add this because i just diagnosed my issue. Hope it will help people in colder areas. Hey Guys, so I live in Calgary Alberta......With this said, our winters get frigidly cold -20C common......my 4wd service comes on/fuse blows/lights on selector switch goes out. Nothing works...found a write up - not sure if its from GM directly. But it states, if your 20amp ATC fuse keeps blowing, but Encoder @ T-case works......front diff actuator works. You're getting get grounds.....good voltage at connectors....( Bench test front actuator ) and it works.......and there is no code for TCCM ( Transfer Case Control Module ) ....it is the 1640 connection - they used 18 gauge wire from factory but during colder than normal ambient temps - it will spike in amps and blow the fuse....The easy fix is replace with 25amp fuse. OR replace the Orange wire - with 16Awg. DONT GO SPLURGE ON PARTS BEFORE YOU DO ALL YOUR CHECKS!!!!
you my friend are a lifesaver! this guy sold me a 2002 chevy 1500. was asking 4,100$ but when i noticed the 4wd was not functional he ended up selling it to me for 2,000$ after watching your video guess what happened. yeah it works now. thanks for posting buddy!!!!
I made the below comment many years ago. I just had noticed I had done so when logged in on my girlfriends account. So I just cut and pasted it correctly as me. I do want to add that doing what I suggest is what I did after driving my truck for like 2+ years with the "service 4WD" message showing. It fixed my problem, cost nothing and no reprogramming! ---------- DO NOT BE AFRAID TO DO THIS: Remove the switch completely and go to your workbench. Open up the switch by prying the clips etc. (THERE ARE VERY FEW PARTS TO THIS SWITCH AND NO SMALL PIECES ETC) You will likely find broken solder joints. With solder iron, heat each joint and reassemble. It is VERY easy, even if you haven't soldered before. DO NOT BUY A NEW SWITCH! VERY EASY REPAIR FOR EVEN A NOVICE MECHANIC.
On my 04 Silverado it was mounted to a silver bracket almost right by the emergency brake if you look up. Did everything from down by the pedals vs through the left of the dash after I realized it wasn't located there. 4WD now works!
Good advice on how to remove the module. I struggled with getting it out, then when I heard you say unplug it and rotate it to the right, it came out in like 30 seconds. Thanks man!
Great. The part that you took out and made it work is the TCCM= Transfer Case Control Module. It is responsible for the communications between the ECM, the front differential box, the gearbox and the transfer case. When change the actuator and / or the motor that fits on the front differential, you need to reset it using a programmer like Maxidas or Tech 2. You also must make sure that you took the TCCM off an exactly similar truck like yours. Any different settings in the TCCM, like tire size or drive ratio, will cause a severe damage to one of the major transmission sets underneath your vehicle. Otherwise, you need to re-flash the new TCCM to be compliant with the remaining parts on the truck.
Thanks for this advice, Im sure most won't think of the programming issue. I assume it needs to be programmed even if you buy a new one off of amazon or napa, or even an OEM if you can find one. Can you confirm if it comes pre-programed? or is this used on many models and needs to be programed accordingly?
@@ramirogutierrez2940 i have got the same issue as you have and now all light are off !! Only gets on when I switch the key on after that all lights on switch get off. Have you got your diagnosed or fixed?
That sucks you had such a hard time with that but I think you saved me a lot of trouble... I did the test on my switch to find it was within spec and from there I was not sure what to do all the lights light up on startup but then they all go out quite similar to this issue....
I have 2000 Silverado and also replace the transfer case dash switch and the transfer case module but to no avail. I just ordered the TCCM for it so hopefully this will do the trick, thanks.
Imma just add this here. I have the same autotrac transfer case and mine ended up being burned out clutches in the t-case. But now I the switches won't light up untill I fire it up, you vid makes me think it's my module. I know it's an old vid but hey I found it so so will somebody else.
@@nak_attack no sir no luck so far :( I changed the encoder motor on the side of the transfer case, changed the front axle actuator too but goes back into 4WD. Now my last option is changing control module inside the dash.
Mine did the same but I had It scanned and it gave code C0309 for the transfer case module without spending money throwing parts at it. But I did check all ground wires also that are under driver door on frame.
This video helped me so much. I was having the same issue and couldn't find anything on it. I went last week and got a used control module and put it in. But can't test it out yet due to my transmission and everything being rebuilt at the moment. And is this a 2500?
Best thing to do is scan with a scan tool and diagnose properly from there. Transfer case shift motor on side of transfer case is a widely known issue with Gmail np246 transfer cases. Here's another one for you if you have a 01 thru 09 gm. Google search "GM Pump Rub" and go from there. A company called Merchant Automotive males a good adapter that's machined and replaces the oil pump half facing the rear case half of the transfer case. Don't use the Dorman rear case half as mine wouldn't allow the vehicle speed sensor to sit like it should so I'll be returning it to my local parts house for credit and spending the extra 200+ for a gm rear transfer case half. The Dorman case don't allow the rear vehicle speed sensor to sit all the way in as it should without keeping the transfer case input shaft from turning by hand. I even took it to a transmission shop that does a lot of rebuilds and they were stumped and told me to get a different case from them or the gm one. Apparently they get their case halves elsewhere also. Since I installed the rear case half my speedometer don't work till about 20mph and I have a ABS and service brake system code that points to the visit sensor which we couldn't screw all the way in which I'm almost certain isn't able to read and acquire the proper signal to work properly. On the transfer case shift motor don't buy the aftermarket brands either or you'll pay later as well as my transmission shop informed me and they weren't trying to sell me one either. Just replacing the encoder inside the shift motor is asking for headache as well. My Tahoe was dropping into 4 love on its own after I'd been involved in an accident. The transmission shop guy said those motors are like thermostats and any excessive jolting causes issues. Been getting transmission work done there 20 plus years and the owner just gives me good advice when I need it and in return when the work is to much for me he knows he'll get the work.
Thank you for posting this video. I have replace the encoder module motor on the side of the transfer case along with 4x4 switch. I have not yet replaced the front actuator (hopefully that will fix my issue) truck is stuck in 4Hi should I take module motor back out and put it in Neutral or 2wd in order for the transfer case to shift into 2wd, 4Hi etc??
Was your truck able to move? Was it stuck in 4 low or moved very very slowly/weak? My truck just randomly stopped working. Couldn't reverse, couldn't drive, just revved up. Had to click auto 4 to get it to move, and then it sounded like something banged into gear. Then I was able to drive in 2 high again till it would slip out of drive and seemed like it would shift into neutral by itself. I replaced just about everything you did except for the front diff sensor. The TCMM is my last hope. My truck is stuck a state away!
Were you stuck in neutral when you replaced the transfer case motor? I replaced everything just like you except the TCCM and currently stuck in neutral. The tccm is in the mail wish me luck lol!
Hey man question so if I'm just driving and all of a sudden my truck shifts in 4WD HI By it self and also jerks a little once you go over 10mph is it the Actuator u think needs Replacing?
bet it felt great when those orange little light lit up huh...I'm having the same issue. just bought the switch and nothing... this happened after I replaced my transfer case
No I didn’t get it fixed it randomly started working it’s been so long ago I can’t remember what I did exactly. I had to replace transmission for unrelated problem and after that it started working. I think there was a connection on the transmission that was causing it.
Replaced passenger side cv axle on my 2006 gmc sierra. Now it makes a noise (only in 4wd) when turning. Makes the noise when I turn right or left. Sounds kinda like a barking or rubbing tire. My service 4wd came on also. NO noise in 2wd. Replaced with Napa Auto manufactured axle. Any Idea what could be going on?
My lights quit working on the switch so I replaced it and still nothing they do come in when I turn the key... So would it be the TCCM like yours behind the dash
Check fuse then pull switch out of the dash and wiggle the connections where they hook to the back of the switch with the key on.Mine was corroded and cleaning the pins fixed the problem.
hey , anybody, I have 99 chevy silverado. It doesn't shift from 4hi to 2w,, I already change everything new tc module, tc motor actuator with sensor, and still doesn't shift, ,, it stay on 4hi, , I scanned y I got code c0323 that means low circut brake, I don't what to do now, ,, if anyone have the same issue, I'll appreciate any help, ,,
check ground wires under drivers door, two ground points next too each other 3 or 4 wire . may have to flash the control module if you haven't done that
You replaced a bunch of parts that didn't need to be ! Hooking up a professional or factory scan tool an checking DTC'S - diagnostic trouble code's in the transfer case shift control module is what should have been done . Qualified repair shop .
+william marshall I also had this problem and first I changed out the selector switch, but this did not cure the problem. I then took out the transfer case motor and replaced the sensor inside there, no problems so far. Replacing just the sensor saved a lot of money over replacing the entire t-case motor
All this videos tells you is if you have enough money replace every part and hope you get lucky no diagnosising at all pretty terrible. And a waste of money in parts.
Ok I MUST say, bay far one of the BEST videos about this issue on TH-cam!!!!
You need your own show my friend!
GOOD VIDEO MAN. I want to add this because i just diagnosed my issue. Hope it will help people in colder areas.
Hey Guys, so I live in Calgary Alberta......With this said, our winters get frigidly cold -20C common......my 4wd service comes on/fuse blows/lights on selector switch goes out. Nothing works...found a write up - not sure if its from GM directly. But it states, if your 20amp ATC fuse keeps blowing, but Encoder @ T-case works......front diff actuator works. You're getting get grounds.....good voltage at connectors....( Bench test front actuator ) and it works.......and there is no code for TCCM ( Transfer Case Control Module ) ....it is the 1640 connection - they used 18 gauge wire from factory but during colder than normal ambient temps - it will spike in amps and blow the fuse....The easy fix is replace with 25amp fuse. OR replace the Orange wire - with 16Awg. DONT GO SPLURGE ON PARTS BEFORE YOU DO ALL YOUR CHECKS!!!!
you my friend are a lifesaver! this guy sold me a 2002 chevy 1500. was asking 4,100$ but when i noticed the 4wd was not functional he ended up selling it to me for 2,000$ after watching your video guess what happened. yeah it works now. thanks for posting buddy!!!!
Nice explanation of how to identify which part is bad by how the switch reacts!!!!! Thanks
I made the below comment many years ago. I just had noticed I had done so when logged in on my girlfriends account. So I just cut and pasted it correctly as me. I do want to add that doing what I suggest is what I did after driving my truck for like 2+ years with the "service 4WD" message showing. It fixed my problem, cost nothing and no reprogramming!
----------
DO NOT BE AFRAID TO DO THIS: Remove the switch completely and go to your workbench. Open up the switch by prying the clips etc. (THERE ARE VERY FEW PARTS TO THIS SWITCH AND NO SMALL PIECES ETC) You will likely find broken solder joints. With solder iron, heat each joint and reassemble. It is VERY easy, even if you haven't soldered before. DO NOT BUY A NEW SWITCH! VERY EASY REPAIR FOR EVEN A NOVICE MECHANIC.
On my 04 Silverado it was mounted to a silver bracket almost right by the emergency brake if you look up. Did everything from down by the pedals vs through the left of the dash after I realized it wasn't located there. 4WD now works!
Good advice on how to remove the module. I struggled with getting it out, then when I heard you say unplug it and rotate it to the right, it came out in like 30 seconds. Thanks man!
Great. The part that you took out and made it work is the TCCM= Transfer Case Control Module. It is responsible for the communications between the ECM, the front differential box, the gearbox and the transfer case. When change the actuator and / or the motor that fits on the front differential, you need to reset it using a programmer like Maxidas or Tech 2. You also must make sure that you took the TCCM off an exactly similar truck like yours. Any different settings in the TCCM, like tire size or drive ratio, will cause a severe damage to one of the major transmission sets underneath your vehicle. Otherwise, you need to re-flash the new TCCM to be compliant with the remaining parts on the truck.
Thanks for this advice, Im sure most won't think of the programming issue. I assume it needs to be programmed even if you buy a new one off of amazon or napa, or even an OEM if you can find one. Can you confirm if it comes pre-programed? or is this used on many models and needs to be programed accordingly?
Michael Grifoni Yes it needs to be programmed if new or used unless you take it off of a truck like yours
Why is my light on auto 4wd I never moved it, it was on 2wd and now it doesn't let me press any other buttons
@@ramirogutierrez2940 i have got the same issue as you have and now all light are off !! Only gets on when I switch the key on after that all lights on switch get off. Have you got your diagnosed or fixed?
@@yassergf1904 my lights were off for like 1 month and all of a sudden its on 4high but I check it and drives in 2wd
That sucks you had such a hard time with that but I think you saved me a lot of trouble... I did the test on my switch to find it was within spec and from there I was not sure what to do all the lights light up on startup but then they all go out quite similar to this issue....
I have 2000 Silverado and also replace the transfer case dash switch and the transfer case module but to no avail. I just ordered the TCCM for it so hopefully this will do the trick, thanks.
David Osborne . Check the connection on your plugs under the truck also , mine were just dirty
Imma just add this here. I have the same autotrac transfer case and mine ended up being burned out clutches in the t-case. But now I the switches won't light up untill I fire it up, you vid makes me think it's my module.
I know it's an old vid but hey I found it so so will somebody else.
You, my friend, are awesome!!! Saved me from all kinds of headaches.. and$$$ thank you
so what did you do
fucking love you bro...only one that could answer this problem!!
My truck doesn’t want to go back to 2WD. What should I do? I ordered the new switch buttons but idk if that would fix my problem
I’m having the same problem! Any luck?
@@nak_attack no sir no luck so far :( I changed the encoder motor on the side of the transfer case, changed the front axle actuator too but goes back into 4WD. Now my last option is changing control module inside the dash.
Parts shotgun! Part parts parts for everyone
Mine did the same but I had It scanned and it gave code C0309 for the transfer case module without spending money throwing parts at it. But I did check all ground wires also that are under driver door on frame.
This video helped me so much. I was having the same issue and couldn't find anything on it. I went last week and got a used control module and put it in. But can't test it out yet due to my transmission and everything being rebuilt at the moment. And is this a 2500?
Best thing to do is scan with a scan tool and diagnose properly from there. Transfer case shift motor on side of transfer case is a widely known issue with Gmail np246 transfer cases. Here's another one for you if you have a 01 thru 09 gm. Google search "GM Pump Rub" and go from there. A company called Merchant Automotive males a good adapter that's machined and replaces the oil pump half facing the rear case half of the transfer case.
Don't use the Dorman rear case half as mine wouldn't allow the vehicle speed sensor to sit like it should so I'll be returning it to my local parts house for credit and spending the extra 200+ for a gm rear transfer case half. The Dorman case don't allow the rear vehicle speed sensor to sit all the way in as it should without keeping the transfer case input shaft from turning by hand. I even took it to a transmission shop that does a lot of rebuilds and they were stumped and told me to get a different case from them or the gm one. Apparently they get their case halves elsewhere also.
Since I installed the rear case half my speedometer don't work till about 20mph and I have a ABS and service brake system code that points to the visit sensor which we couldn't screw all the way in which I'm almost certain isn't able to read and acquire the proper signal to work properly. On the transfer case shift motor don't buy the aftermarket brands either or you'll pay later as well as my transmission shop informed me and they weren't trying to sell me one either.
Just replacing the encoder inside the shift motor is asking for headache as well. My Tahoe was dropping into 4 love on its own after I'd been involved in an accident. The transmission shop guy said those motors are like thermostats and any excessive jolting causes issues. Been getting transmission work done there 20 plus years and the owner just gives me good advice when I need it and in return when the work is to much for me he knows he'll get the work.
Very Helpful. Thank you Sir. I gotta do my module.
Very awesome bro thank you!
Hi dear Toly, many thanks for your video, i have the same problem, were i can get the control 4WD panel ?
Was the old module making you dashboard click?
I just hope it's all the same for my 01 2500
Thank you for posting this video. I have replace the encoder module motor on the side of the transfer case along with 4x4 switch. I have not yet replaced the front actuator (hopefully that will fix my issue) truck is stuck in 4Hi should I take module motor back out and put it in Neutral or 2wd in order for the transfer case to shift into 2wd, 4Hi etc??
Did this work for you
@@dougradford5100 it did not. I finally got rid of the truck due to bad transmission once again
Helped me so much bro thanks!!!!
You could try to reset the old one first before replacing all that stuff.
great video.... helped me out alot
Saved me a lot of money
Thx for video man. Works good
Thanks brother. Great Video
My is not working when I plug in my blower controler.then when unplug blower controler the 4+4 starts working but the fuel gauge starts acting up.
For one is, how much did the new part cost you
what's the part he replaced called the silver box
+Joey Dally Transfer Case Control Module. On this model it is likely part # 15749703
Best video ever thank u I struggled so hard finding location on this module everyone sells part but don't show where it is
Where can I buy it ??
So are you supposed to drive or have it in auto four-wheel-drive or in 2 high?
did you get it reflashed?
Dude just take off your ground wire under your drivers door and clean it up it will go away it fixed mine but my switch is still broke
so that means you still have a problem
mine is saying service when i mash the gas its not going fast
Sounds like youre stuck in 4low
Mine is like that i think mine is stuck in 4low
99 Tahoe and I put a new switch and it still will stick n 4 lo and I shut it off and wait a few minutes it will go back into 2 hi
Did you have to program this or just plug and play?
need program.for.sure
Остался только час))))) Рашн музик из плеин ин бэкграунд))
I got a 2000 silverado and my lights won't even light up on my switch do u have any ideal whats wrong with mine
Was your truck able to move? Was it stuck in 4 low or moved very very slowly/weak? My truck just randomly stopped working. Couldn't reverse, couldn't drive, just revved up. Had to click auto 4 to get it to move, and then it sounded like something banged into gear. Then I was able to drive in 2 high again till it would slip out of drive and seemed like it would shift into neutral by itself. I replaced just about everything you did except for the front diff sensor. The TCMM is my last hope. My truck is stuck a state away!
what happened?
+milesn20 It was the TCCM that went bad.
Does anyone know what the extra wire behind the light controls is for?
where did you buy it and what is the name ?
Were you stuck in neutral when you replaced the transfer case motor? I replaced everything just like you except the TCCM and currently stuck in neutral. The tccm is in the mail wish me luck lol!
The TCCM fix the problem?
Do you have to program the new TCCM? Thank you
My transfer case is stuck in neutral and won’t let me shift into gears to even get it to a shop to scan it
Hey man question so if I'm just driving and all of a sudden my truck shifts in 4WD HI By it self and also jerks a little once you go over 10mph is it the Actuator u think needs Replacing?
bet it felt great when those orange little light lit up huh...I'm having the same issue. just bought the switch and nothing... this happened after I replaced my transfer case
Marvin Orellana same here how did you fix it? My lights come on but I'm currently stuck in 4l and my front tires do not pull.
@@kotabrd14 did you get this fixed? This is exactly what my 07 Sierra is doing. Switch states it's in 4 hi but actually only in 2 rear. Thank you
Sorry 09 Sierra
No I didn’t get it fixed it randomly started working it’s been so long ago I can’t remember what I did exactly. I had to replace transmission for unrelated problem and after that it started working. I think there was a connection on the transmission that was causing it.
Is that Kino? The music.
Replaced passenger side cv axle on my 2006 gmc sierra. Now it makes a noise (only in 4wd) when turning. Makes the noise when I turn right or left. Sounds kinda like a barking or rubbing tire. My service 4wd came on also. NO noise in 2wd. Replaced with Napa Auto manufactured axle. Any Idea what could be going on?
DeerHunter530 that noise is your U-Joints slowly committing suicide. Don't use 4X4 unless you need to. Keep it in 2WD or Auto
It ended up having something to do with the shitty after market NAPA axle i bought. Put an OEM axle on and no noise or problems with 4x4 anymore.
@@deerhunter5305 4G grrr F
Yo fellas. Before doing all this check to see if the fuse is good. I did it wasn't problem solved.
Which fuse? On my switch, none of the lights next to the 2x4, 4x4 hi, and 4x4 lo are on.
My lights quit working on the switch so I replaced it and still nothing they do come in when I turn the key... So would it be the TCCM like yours behind the dash
Interested if you got yours working? My lights on the switch itself will come on when you turn the ignition on, but then they go out and no response.
@@lsluvr7386 yes change the transfer case shift motor
So you got a new shift motor and it lined up and the switches lit up again?? I have the same issue right bow
@@mariez71 yes sir
why when most peoples recording have to music on the back ground?
Thanks!
Great Vid.
How much u paid for the module?
Thanks bro help a lot
Decent video,...just wish he would of videoed HOW,...he removed the TCCM, instead of just showing it already back in..
good job
what lift is on the truck
Hey man you think I can buy a used one ?
My switch wont even light up do u know what it could be ?
Check fuse then pull switch out of the dash and wiggle the connections where they hook to the back of the switch with the key on.Mine was corroded and cleaning the pins fixed the problem.
hey , anybody, I have 99 chevy silverado. It doesn't shift from 4hi to 2w,, I already change everything new tc module, tc motor actuator with sensor, and still doesn't shift, ,, it stay on 4hi, , I scanned y I got code c0323 that means low circut brake, I don't what to do now, ,, if anyone have the same issue, I'll appreciate any help, ,,
check ground wires under drivers door, two ground points next too each other 3 or 4 wire . may have to flash the control module if you haven't done that
c'est la vie I didn't even look at when he posted lol
Mine did same. Turn off truck. Turn key back on but don't start. When dash lights come on shift transfer case button. It works on my 01 suburban.
Turn your radio off dude so we can hear you better
You replaced a bunch of parts that didn't need to be ! Hooking up a professional or factory scan tool an checking DTC'S - diagnostic trouble code's in the transfer case shift control module is what should have been done . Qualified repair shop .
Very helpful ty... Also subbed
You throwing money away u needed to scan tccu and get code out
can ne1 help me found the problem
It would have been cheaper if you brought another truck
my truck goes in and out of 4x4 by itself whst would cause this?
+william marshall
I also had this problem and first I changed out the selector switch, but this did not cure the problem. I then took out the transfer case motor and replaced the sensor inside there, no problems so far. Replacing just the sensor saved a lot of money over replacing the entire t-case motor
Turn off the background music
Mines stuck in 4Hi😑
Br Uh that’s bad😂
Same on my '14
You are a parts swapper - not a mechanic.
Ponlo en español
All this videos tells you is if you have enough money replace every part and hope you get lucky no diagnosising at all pretty terrible. And a waste of money in parts.
i love you
my
En castellano
That's pretty gay music!
Ponlo en español