
mjm-1957
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mjm-1957 last won the day on August 22 2021
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About mjm-1957
- Currently Viewing Topic: Won’t Start After Few Mins Starts
- Birthday 03/19/1957
Profile Information
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Name
mike
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Location
long island
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Gender
Male
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Drives
2017 gmc2500hd
mjm-1957's Achievements

Enthusiast (5/11)
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mjm-1957 started following 2021 5.3 8spd less than expected gas mileage. , Won’t Start After Few Mins Starts , Rebuilt the Transmission, now I'm in deep s*** and 7 others
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Won’t Start After Few Mins Starts
mjm-1957 replied to Jordan Horvath's topic in 2014-2018 Silverado & Sierra Troubleshooting
We change a lot of starters on those trucks at work. -
Rebuilt the Transmission, now I'm in deep s***
mjm-1957 replied to rallysport096's topic in 2014 - 2019 Silverado & Sierra
Pin 14 is circuit 2500 dark blue wire is high speed communication circuit, you were correct, pin 13 is blank on your model,sorry about that. If I could post the schematic you would have seen that. These old eyes aren't as sharp as they used to be. Glad ypu got it going. -
Rebuilt the Transmission, now I'm in deep s***
mjm-1957 replied to rallysport096's topic in 2014 - 2019 Silverado & Sierra
Pin 13 is high speed communication circuit 2501. I cant figure out how to upload the schematic. If you have access to service information from GM the document ID number is 3627766. That should get you talking with the TCM again. -
Rebuilt the Transmission, now I'm in deep s***
mjm-1957 replied to rallysport096's topic in 2014 - 2019 Silverado & Sierra
Make sure the connector at the transmission is fully seated and there are no bent or backed out terminals, the scanner should see the TCM at start up.If that checks out okay make sure the passthru in the case is fully seated and that the retainer is fulled locked.It should snap and click into place when fully seated. -
Another 2021 Sierra lifter failure help needed
mjm-1957 replied to JayinNH's topic in 2019-2021 Engine, Driveline, & Exhaust
What time did you start drinking today if you actually think GM makes 20,000 in profit on the sale of these trucks?I work in a GMC Buick dealer and can tell you you are slightly off in your arithmetic. -
New hub doesn't fit 2016 sierra 1500??
mjm-1957 replied to Troxic's topic in 2014 - 2019 Silverado & Sierra
Are you talking about the knuckle? The hub has the bearing in it. -
Not stock, I have the same truck and it doesn't have them.
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6L90 torque converter shudder
mjm-1957 replied to scole's topic in 2015-2019 Silverado HD & Sierra HD
Have the dealer drive it with GDS 2 installed and command the tcc off 100% and note if the shudder still occurs. I am bettting the 456 clutch is slipping, not the converter. Three defective ones in a row??? Doubt it. I am the transmission guy at a GMC Buick dealer and have seen this before. They can also monitor the slip speed with the GDS while commanding the TCC on 100 %, will tell them which way to go. -
U1345 code Duramax
mjm-1957 replied to Klint's topic in 2020+ Silverado HD & Sierra HD Troubleshooting
It is a LIN bus communication error with the ECM. Bring it back to the dealer and let them fix it. -
Welcome to GM. I have a stack of bad fuse boxes under my bench for all sorts of problems. I keep them for all the fuses and relays as spares.The high speed wiper relay is also internal and goes bad quite often. That fuse box is not cheap either.
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The horn relay is internal to the underhood fuse block. If the wiring checks out and the air bag is good, than the relay may be shorted and keeping the horns on.
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Ambient Air Sensor Troubleshooting
mjm-1957 replied to Mdahn0331's topic in 2015-2019 Silverado & Sierra HD Troubleshooting
What engine do you have? L5P or L96?
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