LML Tcm

[ikeG]

Does heat soak bring on the dreaded bad tcm issues? I have one here that will drive fine until you stop and let it idle. Trips a dozen dtcs. Voltsge, over temp, etc

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[2004LB7]

I've never heard of it on a Duramax. But plenty of times for other electronics. Usually caused by a cracked solder joint. Only way to fix it short of replacement, is to reflow the solder. Happens most often at the chips or the connectors.

The 1st generation X boxes had this issue. Fixed one for my cousin by fluxing the chips and putting it in the oven to melt the solder.

 

[Dallas S]

I have a “test” T14 here that fails every time internal temp hits 76? 67? Degrees. There is a PID for TCM temp. Our “test” unit always works cold, and when it hits that certain internal temp it appears to go into a relearn mode(increased rpm, random clutch application)

 

[Chevy1925]

IIRC the overheat is something to do with lack of heat transfer from the chip to the heatsink, could be a cold joint too. Evan had a truck come in while i was at his shop that did the same shit. Kory said "put it in the freezer for a bit, probably works fine after you put it back in". sure as shit, it did.

 

[ikeG]

The one I have here now fails at 116 degrees everytime. So in this cold weather, it never gets that warm until you stop. Then it slowly heats up.

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[ikeG]

The one I have here now fails at 116 degrees everytime. So in this cold weather, it never gets that warm until you stop. Then it slowly heats up.

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[rcr1978]

Common deal on them, I had a few that did the same thing.

 

[Ron Nielson]

But the good news is that the TCM very well may be repairable, just as 2004b7 posted.

 

[ParisWash]

Any update on this issue? I have a new replacement from GM with less than 200 miles on it and I have a feeling it overheated itself just now. It’s cooked a few transmissions and I would love to find an answer.