UpFix
UpFix is offering a new Allison automatic transmission control module (TCM) repair service for 2009-2015 GM HD trucks.

UpFix announces Allison Transmission Control Module (TCM) repair solution

July 6, 2023
While a failed transmission control module can be replaced with a new or used unit, UpFix is offering a repair option as well.

UpFix is offering a new Allison automatic transmission control module (TCM) repair service for 2009-2015 GM HD trucks.

According to the company, documented Allison TCM failures affect 2009-2015 Chevrolet/GMC 2500/3500 HD trucks, some 2008 and 2009 Chevrolet Kodiak vehicles, and GMC Topkick C4500-C6500 trucks. Specifically, the Allison TCM is used with Duramax diesel engines with engine RPO codes LBZ, LMM, LML, LLY, and LGH.

According to UpFix, the Allison A50/T14 fourth generation TCMs have the highest failure rate and is caused by the TCM’s circuit board conformal coating failing due to heat and vibration, leading to transmission issues.

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To repair this internal failure, UpFix has developed a repair process as follows:

“We start by removing the conformal coating from specific areas, a step to prevent future problems,” said Ernest Martynyuk, UpFix auto electronics division lead. “We apply improved thermal paste to better control any future heat issues, we replace key microprocessors updated with the latest firmware specific to the vehicle and the vehicle’s VIN, then our techs inspect and repair all connectors, clean and inspect, and seal the unit.”

UpFix then uses software to confirm the TCM functions perfectly. The finished repair is ready to install out of the box with no additional programming needed.

Once the non-functional Allison TCM is removed and sent to UpFix for repair, UpFix typically services and returns the renewed TCM in a few days.

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