Allison 5 speed TCM common issues and fix Allison 1000
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- เผยแพร่เมื่อ 8 ม.ค. 2018
- COMMON ISSUE FIX WITH THE ALLISON 5-SPEED TCM. CHECK THE WIRING TO THE TCM FIRST. THE PINS ARE PRONE TO FALLING OUT OF THE LOCK AND BACKING OUT OF THE CONNECTOR. CHECK THIS FIRST BEFORE REPLACING ALLISON 1000 CONTROLLER.
Wiring Diagram for 5-speed units only
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Replacement 5-speed programming
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My son has a 2003 2500 silverado with an Allison transmission. When he was 1200 miles away from home on a job assignment the transmission all of a sudden wouldn't shift out of 1st. He had it towed to a transmission shop that had an Allison technician. They pulled codes and determined it needed a $4200 rebuilt transmission replacement. I used to be an ASE Master technician and I just couldn't believe that at 80k miles the trans was toast. So I researched the trans and came across this video. I instructed my son at to what to do and where to look. After repositioning and cleaning the plug contact pins the transmission worked flawless. Thank you so much for this video!
Nice! Good job to you and author of this vid.
“Used to be a ASE master tech” BS!!! If that were true you wouldn’t need any videos
@@meatyklaws8774 haha different models different strokes.
@@meatyklaws8774 😂🤡
@@meatyklaws8774 Haters gonna hate. I'm a master and I use videos all the time. They are often better than tech data for me because listening and watching a professional sort through complicated problems lets me see what I've done already and what I might need to try. I'm ALWAYS wary about replacing modules without thorough investigation.
I have a 03 Chevy Silverado k2500. It out of nowhere stopped shifting out of 1st, speed gauge stopped working, temp gauge stopped working and so did the rpm’s gauge and had abs and parking light on and engine light. We went and changed the abs speed sensor which did not fix the problem, and then was led by people to think it was a instrument cluster. Changed out the instrument cluster, did nothing. I ran the codes on my truck and found it reading a ton of different codes but the main one being the transmission control module. I really did not want to have to buy that with how expensive it is and how expensive the cluster was but I came across this video and went out and sure as heck, one was completely unplugged!!!!! You saved me time, money, and a headache. The truck works perfect now all the gauges are reading right. And lucky me, I found the video in time and fixed it so I still have 30 days to return the instrument cluster and get my money back!!!!!
:)
Thanks Spartans. Two pins in my TCM connector, were pushed back. Just pulled them forward and tacked them with a spot of epoxy, on the under side of the pin. Now the transmission shifts like butter. Before the fix my 2001 GMC 2500hd 8.1L , would have to rev high to get out of first gear, then would not shift out of second gear. I had taken the TCM off to perform some maintenance, that's when they got pushed back.
Great video. I got the Hosa D5S-6 CAIG DeoxIT 5% Spray Contact Cleaner and used it on both male and female sides. Took an old tooth brush and rag to the connectors then let dry. Put it together and cleared the trans trouble code(s). Took it for a long drive and tested for codes along the way and this morning. Codes gone problem solved after years of living with the one none critical code. Thank you for sharing your knowledge and experience with us! Youd da man!
I have to thank you immensely for this video. Saved me money and time with the dealership. Had to remove the TCU to get to water pump and it must've been enough to back the last pin on the red harness. If you were local, I'd buy you a beer!
Time for a road trip lol
Cash app him a cold one lol
I was just about to replace my TCM 5 speed and I will check this first. Thank you thank you. God bless you.
Good luck!
Omg five shops and 2000 later this fixed my 708 code with me doing in ten mins. Cant believe not one shop knew this and seeing so many others with same issue. Please add more to title so others can find when looking up tcm problems
Andrew Augustine what year was your truck im having trouble getting to the pins on mine its a 2011 6 speed
Trust me the shops know all about this. No money in fixing the actual problem but they can bilk you for all kinds of $$ "trying" to fix it.
Thank You! I replaced the fan shroud and suddenly had transmission issues. Smashed on the wiring back into the controller and boom it works. I will check the pins soon and actually fix the issue but you saved me a lot of time and money at the dealer! Thanks again!
Did it work?
Yes. Haven’t had an issue since. It’s been a few months now with no issues since.
@@tb3687 Thats good! I had to move the fan shroud a year ago to change the PS pump and I've been having a Trans Hot Engine Idle problem ever since. I've taken the pins out and cleaned them and made sure they were secure over and over with no luck. I'm so over it.
Funny how vehicle manufacturers seem to have great ideas like the L shapes pins to take the headlights out with, but then they have garbage wiring for many years having the same issues with every vehicle, and they don’t do anything to fix the problem.
I bet if they gave an extra couple inches of wire and didn’t bend it so tight, that harness wouldn’t have any issues.
@@Jacobtaylor1775 Did you ever get this issue solved? I am having a similar issue where after driving for about 5 minutes the trans temp gauge will rise rapidly to 300. The dash high temp warning light will come on. This obviously isn't long enough to see that type of temp increase. Then suddenly the gauge will settle down to the normal operating temp reading and the warning light goes off. The other day after it had been sitting for a few hours, I put the key in and turned to the on position and the temp gauge showed over 200 degrees when it was absolutely cold.
Overall, this is a very helpful video.
But it took me a couple of views of your video to figure out what you meant by the red connector vs the clear connector. The clear was easy to spot. It wasn't until I recalled seeing a red plastic cover laying on the TCM that I put the connector in your hand with the red cover that you had previously removed. Now that part of the video makes sense.
I still didn't see where the connectors are attached to the TCM. Right now my 2004 Itasca RV is on the shoulder of a street here in Vegas stuck in Neutral. I has a red 'Range Inhibit' and a yellow 'Transmission Fail' warning lights. It's an Allison 1000(MH?) 5-speed, Workhorse W-22, 8.1L. Maybe where the connectors are plugged in will be obvious when I return to my RV and view the TCM?
Thanks a lot .I don’t usually comment but this video saved me a lot of time and money. This was my exact issue. I’m back on the road. Thanks again
Always happy to hear when customers get it fixed. 😎
Badass video!! Perfect fix for my truck issues today! Thank you.
You just saved me a lot of money thanks to your TH-cam knowledge my truck has reverse and 5th gear again, did exactly what you said and it works normal again🤟
Glad I could help
So I have the same issue layed into throttle to pass and about 20secs after truck came to a hault and I pulled off the road no reverse stuck in whatever gear it was in. Check engine light came on immediately, I turned truck off back on everything was fine but felt like it wasn’t shifting right. Cleard codes changed red spin on trans filter cleaned the plug on passenger side for trans still seem a bit oddly when shifting im scared to death to even press on the gas more then I have to. I hope this works gonna try it
@@chrismalone4491I have the same issue with my duramax. Did you find the problem?
@@timf4292 believe it was low on tranny fluid I stayed out of my big tunes for awhile but got the itch layed into it plenty of times since and couldn’t ask for something to behave so good. I did clean the plug up too on the tranny
Man this worked saved me a trouble and money. Thanks again keeping another Allison on the road.
No problem 👍
Had the same exact problem on my 05 GMC 3500 with Vortec 8100. Someone had replaced the lower radiator hose, and routed the wires underneath it. That caused extra strain on the harness, and pulled out a wire that had to do with torque management for the Allison 1000 and it started throwing torque management codes. Had another problem where I received the message "Range Shift Inhibited" on the display... Common problem, mine turned out to be the ignition switch. Really easy fix, and cheap. Symptoms were sometimes no gears, other times stuck in second or third, also pcm threw many trans codes... Check for power on the large white wire connected to the ignition switch... It should have power when the key is on, if not, the switch is bad. Only tool needed to change it is a flat screwdriver, did mine in the Napa parking lot. Just make sure to line up the cogs on the new switch. Has worked great ever since.
hey man I'm not sure if four yrs later you'll see this message.But my 04 dmax has been stuck in 3rd and sometimes 2nd.No reverse.Maybe every 5 or so restarts I'll have reverse.But I haven't thought of the ignition switch.you may have just saved me $5000 on a new tranny
@@royceturner7282 Worth a try for sure. If not holler back at me, there are some other things to check.
Did u ever fix it
@@MoeDog-sy5dj Yes - has been working fine for a long time. Are you having a similar issue?
I had no reverse , just unplugged and re plugged them back in . Fixed ! Thanks !
Excellent!
Thank you for this video, I'm going crazy with all the tcm codes coming and going and thinking it's my tcm, now I will check these pins, I also removed the tcm when I replaced my radiator so I'm wondering if that was enough to pull them out, very helpful video, thank you guys
Very informative video and not staged -- like that the mud dauber nest is still on the controller.
I’m gonna have to go watch and see now lol hopefully I knocked the nest off before I reinstalled it lol
Thanks for the advise. I should have checked the connector after doing my voltage and ground checks.
Thanks for the great video and great customer service to boot!
Wish I saw this before a 8K rebuild, and 2500 dollars suncoast 6 speed conversion. FACEPALM. ugh. Thanks for the video.
Just watched this video, I’ll check the wiring when I get home this afternoon but I’m having an intermittent shuddering and not always downshifting smoothly. I was leaning towards torque converter but I’ll give this a shot
Probably converter
Do a torque converter rpm test
I see this alot with Allison 50/40 hybrid systems for transit Newflyer buses right at the inverter 24 pin wakeup connector and 32 pin A and B motor connectors. I change the female pins, the white pin holder and sub harness wiring due to corrosion right near the connectors. But towards the TCM its never an issue with the connectors because they are in the interior of transit buses.
So I've been chasing wiring issues in my 01 8.1 vortec for a couple weeks now, finally got the diagrams for modules and everything and tested A LOT of the circuits and grounds today. I was able to find a few issues that were causing problems, or would later. I thought my issues were with my TCM, allison has been going into limp mode, when this happens I'm stuck in 3rd and putting the truck into gear does not sound good at all.. but once I got to checking the PCM I found both grounds to its red connector were getting 60 ohms of resistance... I am going to double check, as I am aware this sounds outlandish especially considering some of the pins in that connector were showing over 12v... Might be a different circuit, I am not sure, but the MIL request circuit was showing around 10v. Gonna try running new grounds to PCM red connector pins 1 and 40 tomorrow, codes I've been seeing are p1781 and p1571. I'm a mechanic by trade, but vehicles have never been my forte, and electrical issues sometimes drive me crazy when I am unable to quickly solve them.
You're awesome!! Thank you!!
Mike Fitzgerald
Calgary Canada 🇨🇦
Thanks for watching!
I have a 2008 Chevrolet K2500HD with an Allison 6-speed AT (MW7). The TCM has the single, 80-pin connector. We are getting a P0717 Turbine Speed Sensor Circuit No Signal code with the engine and transmission at normal operating temperature and pulling a load. The Freeze Frame data confirm that the TSS PID is ZERO when the code is set, (All the other speed sensors are normal). A previous shop has replaced the TSS, but there was no change. I get 2629Ω between PINS 20 and 80 of the TCM connector which is what I expect. No harness damage anywhere and all the pins look good. This 80-pin connector is constructed differently than your 5-speed TCM connectors, but nevertheless I checked the pins for broken locks etc.
On a six speed no need to diagnose it’s always the transmission control module lol 😂
Checking my pins today. As when cold shifts hard from 1st to 2nd once warmed up truck shifts perfect. Ideas?
I have an 03 Duramax lb7 with an Allison Transmission the transmission was gone through before I bought it that's all I know was pulling a camper last week this week it has started hanging at the 3,000 RPM mark if I'm giving it fuel hard if I stay in it light it'll change just fine I watched your video and it sort of sounds like I could have that problem I've got two codes they come up first code is p 1621 and the second code is p1781 both of those are communication codes just thought I would ask for your opinion thanks in advance one of the thing I've checked my batteries and both batteries are fine my fluid level is fine in the transmission as well guess that's two things thanks again
Great job bro. THANKYOU
I have a 2008 GMC Sierra 1500 4x4 went to pass a vehicle on day down shifted to third and wouldn’t shift to 4th till about 5k rpms then was stopped idling in drive went to take off an it was like it was in neutral had to turn truck off an start again to be able to move maybe 200 yards an it’s like it went into neutral again . Have to keep turning off an on to be able to move short distance.. Any help or ideas on what’s wrong only owned the truck for 2 weeks !
I have an 01 with cyanide c and e low voltage 6 shops and 4 grand later I still can only get reverse periodically everything but the harnesses and cylanoids (cylanoids have been tested) any info would be a miracle
I have 2001 Allison 5 speed
Checked plugin. It looks great.
How do I test if the TCM. Is bad or not.
If bad what will one cost me, programmed and ready to go?
Awesome video thanks so much
Could this cause multiple issues, i just bought an '01 with allison 5 speed after he fixed p0722 & p0748. Solenoid replaced but speed sensor was the real problem. I purchase and get back home about 2 hours away to it putting out p1721 so now an issue with the solenoid next to the last? Older video but hope to get a quick response wont hurt to try instead of waiting i guess.
Oh and most times indicator lights blink of R and D, if it does go into gear i only got reverse and 1st, no other codes
Fast update: def not apart of my problem
Amazing video 🍾👏☝️
My truck threw a p0732 code incorrect gear ratio along with a p0700 5 speed Allison what’s your thoughts
Thanks for the video. I have an 03 gmc with the 5 speed allison. I have codes p0846 and p0700. It seems to start in third and stay in third. Reverse is fine. Up to this point I haven't had any problems with the transmission.
Check the pins and maybe replace the NSS
@randy did this help? My truck is throwing the p0846 code. If so what is the NSS?
Truck runs fine, but decided to now get out of 1st and than not go into reverse when hauling. Tcm connection fail, section 2 communication problem and tcs falt, more of a wiring or tcm issue ? If wiring can I just buy that section or must the whole
@Spartan Autoworx Thank you for the video. 2002 8.1 Allison 1000 harsh downshift from 3-2 and 2-1 almost like rpm increases to the point of being harsh. no codes. Seems ok in tow-haul Can you help with some advise? Thank you!
So I have a question I was running 95 and then looked down my transmission was running hot so I got it rebuilt but it is not shifting and when it does it goes in for one second then it kicks out of gear what is going on help and I checked the pins on the tcm they are all good
I hit a rough spot in the road and the 1000 allison kicks out of any gear .
And i put it into neutral and back in drive and go down the road to the next big bump.
Once i didn't shift out and got two codes.
P0735 and p0700.
Both fifth gear not in cync.
Good afternoon
Thanks for sharing the video
Where can I buy those connectors of a gmc c5500 transmission allison 1000
I'm having trouble with them
Any luck with yours? Am also having problems with my 4500
My 2003, LB seven has 200 K miles, I just had all kinds of work done to it a shift kit even and everything seems sound for the most part except for when I go over speed bumps. It does not matter 5 mph to 15 it always jumps out of gear. Any ideas on the cause
What is the part number for this? I'm having a very hard time finding this harness. 04 duramax LLY reading code p0872, new valve body, nsbu, throttle cable. Really interested to find this harness
Sorry this is over a year ago but did you ever find the harness name I'm looking for one
So my check engine light comes on and it gives me the tcm code, I check this out first before anything else
I have a 2002 6.6 turbo diesel and every time you try to get on it she will not pass 2,500 rpm and won’t shift and hold the gear and turbo unless you take your foot off the gas and give it gas again I don’t know if the issue is the passing gear or just something wrong with the transmission in general please help!
Mines missing a bunch of those metal pins. Do I have to order a whole new set of connectors ?
Like it corroded off?
David Victurine I have an 02 2500 Hd 6.6 When the vehicle is started the square gear indicator light does not always light up. any suggestions
NSB Switch if nto wiring
Great info! Thank you
So, my truck is throw both u0073 and u0101 do those both usually co-exist?
Hi I have an 04 duramax with an Allison it’s saying shift inhibited and it has all the forward gears but not reverse I am getting a scanner to look at the codes but wondering if this is the trouble or those a b solenoids
got offered a lly with a new trans with the 6speed i guess kit in it because it’s still the 1000 trans but it has the code p0872 and he says it’s a dirty valve body but it’s stuck i. 3rd gear and scares me lol. what do you think trans has 42k
I got a p0875 and 848. Could this be my problem?
im having some issues with my 05. local trans shop says its showing code for solenoid b but they just replaced solenoid b and one or 2 other solenoids and still same problem. whats the best way to contact u guys and ask a couple questions and explain what the truck is doing?
Give us a call on monday
I got a question if you have the time. I push my tow button and no lights come on. I do have a edge evolution tunes on my truck. Do you think that's a button issue or a wire issue?
tow haul button? check for broken wire in orange sleeve on the column
I know you must be a busy guy and get asked tons of questions. But i am having a po742 and of course a po700 as well. The code is saying my torque converter solenoid is stuck on or open. I looked up the code and its saying my trans should be in limp mode or if it's not that i should be bogging down when I come to stops because the torque converter isnt disengaging. But I am having none of these symptoms. The trucks shifts great and runs good. Could this perhaps be a bad tcm? Would like to know more about some of my options. 2001 chevy 2500 hd duramax with 100k miles.
I would check the wiring.
Got a tcm code and shift range inhibited as well as hard shift into reverse and sometimes drive. Just swapped the tcase. Goes through the gears (1-5) good
Truck still working good?
@@brettfell551 yep had to clean the main connector to trans. (Fills with trans fluid) also ignition switch to be safe
@riley s I changed the ignition switch and just did the internal transmission harness and plug. Still having issues with gear shifting when slowing down to about 10mph. Have codes p2610 and p2510. Been thinking it was the TCM but never have gotten the TCM code.
@riley s changing the transfer case stopped the shift range inhibited and intermittent gear shifting for you?
@Brett Fell tcase has a speed sensor in it and I blew that sensor. Also the gasket that's in between the transmission and tcase was leaking trans fluid so truck was low on fluid
I have a 2015 3500 duramax high country. That has intermittent shift issues when in regen mode. Could this be the issue. The dealer can't seem to find the issue after 4x in the shop. Sometimes slams into gear and sometimes clunks when put into gear and sometimes you hit the gas pedal and it wont go
Did you ever find the issue to your transmision? I have a 2016 2500 doing the same thing.
Great video! I just subscribed to the channel. Do you have any recommendations for a 2018 GMC Sierra 2500 L5P that when put into reverse the "R" on the display starts blinking and the truck won't go into reverse? I just changed the TCM fuse. We are scheduled to leave town today for an event 3 hrs. away for our small business and we are stuck at the house. Trying not to panic. Any ideas to try first?
EDIT- Codes being shown are P249D, P0701, P0731, P0751, P0756, P06C6
Bad tcm
2007 Chevy 2500hd 6.0 Allison trans drives almost perfect in"D" , but when I select tow/haul mode rpms jump WAY high like over 4000rpm when I'm trying to slow down, could these connectors be the problem as well?
esco361 that would be your engine breaks I believe
Yeah thats the engine brake its supposed to do that. It down shifts to slow the truck and trailer down without wasting the brakes
have you done a vid on the repair of the pins?.. especially the brittle plastic ones.. Do you just use pliers to pull the pin back into place?
I do not. You can push and pull the pins by hand.
@@SpartanAutoworx Man.. You are the best.. Thank you for your site..gonna try this shortly.. as an aside.. I had my lower coolant hoses replaced a few months ago, but don't drive the truck too often.. thnx again.
I've got an 03 gmc with an 8.1 and allison 5 speed, I've been having an issue with starting, check engine light threw a bunch of trans codes, hard shifting, gear indicator has been working off and on, the main thing is the starting issue. Sometimes it's no crank or clicking of the relay at all, sometimes it clicks or starts to crank and then cuts out before the truck fires, I don't remember what trans codes it has threw me, but I've replaced the starter, connectors on the wiring at the starter, ignition switch all with no success. I'm going to try checking the tcm harness but is there anything else you guys would recommend?
Fuse box or wiring goign to the fuse box. I would guess wiring going to fuse box
@@SpartanAutoworx I have had the fuse box out twice to check all the wiring, I have power everywhere I need to have it in the fuse box, no corrosion, broken wires etc. And when I have no crank no start if I pull the starter relay out and jump it with a wire it turns right over.
I have a 5 speed Allison. I'm getting a couple code's P0700 (TCM) & a P0748 (pressure control solenoid valve control circuit). The thing is the codes are not always there I can drive around for a while come back fire the truck up and I have the codes, then shut it down come back no codes. Do you think these pins could be causing my issue?
I have ordered a Transmission wiring harness, and was about to order a pressure control solenoid thinking that might fix it.
Hi, my 2002 chevy 2500 8.1l automatic w Allison will run in reverse but gets the blinking D in drive and won't move. Do you think it could be the same issue?
I have an 2002 Chevy 2500 6.0L automatic with Allison 1000 transmission.
I have the same issue, transmission shifts into reverse and will move, but in Drive the 'D' blinks and it doesn't have any power to the wheel.
The trans was low on fluid, 5 qts added and it's reading on the 'cold' section of the dipstick when hot and running in Park.
I was hoping it was the low fluid level caused the issue but now I'll be looking at the TCM harness.
Eric, Did you notice the connector in your hand has a loose or bent pin!?! It's the second one from the top left. I tried to read if anyone else has brought it to your attention already, but didn't see anyone mention it.
Been so long since I have seen that truck I dont remember if that was an issued that was addressed. I know the truck is still running good still today or I would be the first to hear about it. lol
hello. i’m having issues with my allison 1000. truck shifts smooth through all gears. but after driving on the freeway trans is about 170 temp. if i hit a slight bump it will lock me in 4th gear and i’ll pull off and turn truck off and on. i get a shift range inhibited code. any ideas man ?????
I’m having the exact same issues let me know if you get yours fixed
Thanks for the video. I'm hoping you still look at the comments on this video after 5 years and might be able to give some help. I have an 01 3500 8.1 with the Allison 1000 that is giving me a P0732 code. The local shop says I'm looking at $4800. The symptoms are that it intermittently will start shifting hard (specifically going into 2nd gear from first and third), then after that happens for a few minutes it won't shift out of 1st gear. If I shut the vehicle off for about 10-15 minutes and restart it, it will work fine for a bit. The time that it starts to work normally after a restart seems to be getting shorter each time, not sure if it is related to temperature. Thanks ahead of time if you or anybody else can help give me a direction to start looking.
Check the wiring first otherwise maybe output speed sensor
@@SpartanAutoworx Thanks, I really appreciate your time.
@@SpartanAutoworx As a follow up, I was told that my torque convertor was coming apart and the pieces were clogging the lines and filter. I ended up having the entire thing rebuilt at Inglewood Transmissions in California.
Hi, my Duramax works fine when it is cold, however after driving for 1 hour or so, then stopping, parking, then starting up and driving again, the shift indicator does not show up under the PRND3.., but will jump to the 3 when shifted to drive and it will not drive, if you let it cool for about 20-30 minutes you can get it to go into drive and go, however after driving another 45 minutes to and hour it goes into a limp mode, shifts down, over-revving the motor and then has to be cooled down before being able to drive. Is this the TCM? I took the TCM off, removed the plugs, looked for corroded plugs etc then put some dielectric grease back on and reassembled, hoever it did not fix it. What do you recommend?
What year truck? Any codes?
Did you fix this problem mate?
Mine is doing the same
I am having a check trans and range inhibited lights on an 03 international 4300 truck and it's stuck in low gear and won't shift into overdrive..notice the speedometer gauge isn't moving up.
What codes?
Check for power at the connector and report back.
Hi I have a 2001 2500 duramax and it will not move when I put it in to gear. When I go back to put into park it grinds like It would if I was rolling and just through it in park. Any suggestions on what to check i have tried it in 4 lo 4 high and two while drive I really don't want to jerk the tray and transfercas out and replace if I don't half to. Any help would be great thank you
If its grinding sounds like something is bad inside the trans.
Trying to troubleshoot a 2005 school bus w/Allison 2000. It seems to be stuck in 3rd gear and the check trans light is on. Initially, we turned it off, turned key to on position and cycled through d-n-d-n-r-n and it came out of limp mode for a while, then went back into limp. Upon inspection, the transmission was very hot to touch (no gauge). Had a local shop try to pull codes and nothing showed up. Any help appreciated.
So no history codes or can you get codes pulled while its not wanting to play nice?
Changed the water pump and the pin back off!
your the man!!!
Thanks
hi, I write from switzerland, my Silverado 2500 hd has a problem when it change to 4th and 5th gear, when I change I feel a big blow in the transmission, I have the error codes p0700 and p1720, also I get stuck in the 4 gear, it no longer changes in the fifth
thanks a lot for the answer
Can this also be the cause of a p0741/p0743? It says 5th gear incorrect ratio and clutch converter stuck off? It’s a 5 speed that has hesitation then goes then after each shift it does a hesitation then goes .. all gears are working but that is my issue when driving and codes it reads with obd2 scanner
Mine pops up for 3rd 4th gear
I have an 09 3500 with tha allison 1000 .it developed a shudder in low take off gears. Especially pulling a traylor. Only code it is throwing is glow plugs. Any idea if it is tyranny or not?
Converter maybe
Hi!! Where can I find the tcm on a 2014 ltz 5.3l 2wd chevy silverado 1500 ? I have a p700 code, all symptoms indicate it's faulty. I could not find it anywhere near battery or inside hood. Some say it's in the transmission itself but where I couldn't see it.
6 speed inside the transmission
Yours is gonna be inside the transmission
When I get on my lb7 in 5th gear it throws you back in the seat and then all of a sudden just goes to neutral. I have to shif it to neutral then back to drive to get it back in gear. Could the wires cause this?
That's is where I would start.
I have a 2005 3500 chevy duramax. Out of nowhere the truck started shifting hard when trying to put into gears, especially reverse! Crazy this is, it only seems to do it after running for about 20min. Any ideas? Will this help me fix the issue?
Check the pins at the connector
Hi I'm new at this. I have an 01 2500 HD 8100 engine with the Allison 5 speed. I get an intermittent overheat on my dash info monitor. Along with the gauge going up to 300 degrees. Checked the temp of the fluid. Also checked the cooler lines. Appx temp was 140 to 160 F degrees. Changed both filters, oil etc. Checked oil lines had no blockage. Still reads high temp. But does also drop down to normal in a second. Please help. Jim
Could be
TCM
Temp Sensor in the trans
Wiring
Have to check it all out.
Have the exact same problem. Replaced Manifold pressure sensor which has temp gauge inside and still have the same problem. Only happens when trans is at operating temp normally while at a stop. Really intermittent at one time it didn’t happen for over a year.
James, did you ever get this issue solved? I am having this issue on my 2001 Silverado 3500 8.1 after having the trans rebuilt about 4000 miles ago.
Hello. I am having a problem with my transmission not shifting into 5th gear until I drive about 1 - 1 1/2 miles. This happens at first start up of the day. Any other time after that it shifts fine. My truck is a 03 GMC Sierra 4x4 4dr crew dually auto. Any help would really be appreciated.
Lincoln Gardner mine does the same thing in the morning only
If it's not setting a code there might be an Inhibit causing this which you would need to hook up to Allison Doc to find. Again if an Inhibit is on it thinks it's doing what it's told and won't set a code or go into Fail safe mode.
If it is cold they do this to help warm the motor up quicker. This is why it only happens with first start up.
@@alanmcnutt6673
Do you know what the temp has to be to trigger this? X or below?
@@robertjackson7590 100 F
Watched the video. Yes I have the same issue. Spend 2 hours getting 2 pins back up. Plastic holder was broke and I kinda fixed one pin. Is there a after market fix for this issue?
Not aftermarket we can sell you a bare connector
I have no com with t cm wont crank and I was checking the ground pin1 and 5 the continuity is not stable and the ohms are 50 to 300 engine ground to pin. But my power probe shows fround signal np.and my etm shows a pink wire on pin 2 that is not there?
Hi would this be causing a range shift inhibited situation?
jeremy xf1100turbo my 2011 is doing the same thing. It shifts soooo hard that it locks the wheels up as it down shifts. Have you had any luck with yours?
2004 lb7 and it gave me the same message.
The truck does fine 1st 2ed and 3ed gear but want go into 4th or 5th and when it gets up to temp it try’s to slip out of gear. But it does fine for in them gears until it gets warm. What do you think could be wrong?
Only does it when the temp goes up?
And I took the trans pan off and that little hole up in there where you can see the clutch’s you can move the clutch’s around a quarter of an inch so I think my clutch’s is wore out in it
Hey brotha, my transmission has 42 different codes, and it did the same with 2 different transmission swaps of good transmissions. im gonna replace the internal wiring harness. Would you do this next, or what is your advice? i was thinking bad TCM, though, with the random DTCs.
two different transmissions and 42 codes on each sounds like bad tcm. We usually dont see that many pulled pins at the tcm to set codes like that. I would investigate tcm.
2005 4x4 6.6 five speed had speed sensor codes and shifting issues replaced all speed sensors and scanner shows good operation. still coding speed sensor p700. Sometimes it starts out in fourth gear, sometimes stuck in 1st. also abs brake actuation. Checked both TCM connectors and found no pulled out terminals. put it back together and have a no crank. batteries are good shift indicator shows no position (not in park?).what could have happened ? now I cant even test drive to see if connections just needed cleaned ! any help out there would be awesome
Popped pcm fuse so you guys know. still coding output speed sensor. will update later
Update?
Lol! It’s been awhile so I’m going to be brief. Found broken wire(s) in harness from TCM to power block. Then found broken wire to sensor in harness from power block to sensor ! Repair wires and transmission worked perfectly for about 6 months until limp mode started happening intermittently. Then found pass through plug contaminated with transmission fluid causing shift solenoid codes. Replacing plug fixed this and customer has been having no issues with transmission since then! Thanks for bringing this back as I did find several issues there! Cheers!
Is there a place to get the wiring harness to the TCM? I had a recurring PS leak and fluid deteriorated the wiring loom and I'm afraid of some wiring issues as a result. I thought maybe a new harness would help. My truck 2003 GMC Sierra 2500HD Dmax is going into limp mode because of a high transmission temp signal. I know it is electrical because it happens randomly and sometimes when I initially start the truck. I measured the temp of he trans pan with a laser thermometer and it is within op temp. For a while I could jiggle the wires going to the TCM and it would go back to normal until it happened again. I took the jacks apart and made sure the pins were properly seated and plugged it back in and I still have the same problem. I didn't have this problem at all until I changed the PS pump and had to move the TCM out of the way to take the shroud off, I'm sure it hadn't been moved since 2003... any advice would be amazing! Thanks
Jacob,
Remove the connector and make sure the sockets are in place and there's no green corrosion. Reassemble. Use a tie wrap and gently pull the harness at the TCM off to the side a little. I used my pocket knife to do the same and the problem disappeared. You have a floating short that will come and go. Go slow and methodically move one thing at a time. Not too many changes at once or you'll never narrow it down.
That or just carefully replace all the sockets and see if that does it.
Thanks Robert! I just saw this! I'll try it! You mean just give the sockets at the TCM just a little pressure to the side?
@@Jacobtaylor1775
Correct, it doesn't take much. If your problem disappear s replace the female sockets for any codes that are present.
Can a feller buy this harness brand new?
Just ran across your video and I have a Allison I have an 05 that is not shifting into overdrive could this have an issue in the wiring 2 has no check engine lights no service codes the only issue is it it is not shifting into overdrive appreciate any comments
Could be
Hey I have a 2008 Chevy Silverado 2500 hd with a 1000 Allison transmission and I have a code “p0762 shift solenoid c stuck on “ do you know how to fix it?
Sounds like bad solenoid
Will that help with an overdrive solenoid code as well as a tcm code?
What is the code and what are we working on?
My 03 f650 did a unusual hard shift and check trans light came on. Truck went into a limp mode and stayed in one gear. Parked the truck for an hour or so started it up check trans light was off and shifts were normal. After about 30 minutes light came back on and went back to limp mode, could this maybe be my issue?
I doubt it. Totally different system on a ford
Hey I have a 2002 model international and i have every gear but reverse and I replace valve body speed sensor shift sensor on side ot transmission. Could this be the tcm I replaced the valve because had a stuck valve in solenoid a. Any information would be helpful thank you. Levi
Also the range inhibit light comes on in reverse but not any other gear.
My pin wire is real short and it keeps backing out the plastic seems weak what's a good way to secure it from the back to keep it in.
Replace connector or make slack for the wire.
so i have an o1 gmc sierra 2500 hd w 8.1L gas and allison 1000, also have an 02 Silverado 3500 dually w LB7 and allison 1000. the Silverado has be wrecked and is a parts truck, my 2500 is my daily, yes fuel cost is horrible looking to change soon as weather permits enough work to do so. 3 days ago and 3 other times while slowing down to make a turn i get the grinding sound as if shifting a manual with out a clutch just not as loud, its a steady grind while slowing for turn my light is green but at about 20mph grinding stops much the way it did other times intermittently, i know nownits not abs pump as i never pressed it. also this time service light, im accelerating slightly out of turn, its in way too high a gear but holds it, luckily my destination part store is next turn and around to park. whole time stayed in same high gear. dignostic tool says tcm failure, short to ground, 4th gear ratio too high, and something about a solenoid, also relists some of same codes twice or more, for a total of about 10 codes. used 4 low to load onto my trailr to pull home, offloaded same and parked. will check connections soon. whats chances tcm from 02 diesel 3500 will work on 01 2500 8.1 gas. sure sbift points will be different rmps and torque converter and pressures may be different. can it be flashed to work, how much $ if i pay shipping both ways. i dont trust the local dealerships, from exp they are parts changers only.
That allison 5 speed tcm will work. Send over both vins and we can check calibrations. If it needs programmed its $110 with return shipping.
So my trucks been shifting harder lately especially in 2 and 3 so people are saying it’s the fuel filter but I’m not sure. But could this also be the cause of it?
Codes? Doubtful it’s filter
I'm going to look at a 2004 with this error code I'm thinking about purchasing. Is there a way for me to confirm that this is the issue without taking tools to a truck I haven't bought yet?
Not really
2005 getting p0700, p0736, p0875. Would this connector be a good place to start? Thank you
yes
I have a 2004 GMC c4500, I don't drive it much and when my batteries die, I need to take you to the dealer to have the PCM TCM reflashed. That's the way around this besides keeping the truck on a trickle charger. Right now my speedometer reads double my speed and it doesn't seem to shift past 3rd.
Any ideas?
What codes does it throw after the battery goes bad
@@SpartanAutoworx no codes... It's at the dealer right now and they said I had to have my PCM TCM reset... Because the driver of the truck left the ignition switch open battery drained PCM drained
All of a sudden I'm getting a hard shift into what seems like 2nd gear and I only have that gear in forward . Reverse fine . Allison 5 so 2002. Replaced NSBU ,same .
Any codes?