ATS 6019404368 A50 to T87 Transmission Control Module Upgrade (TCM)

The ATS Diesel 6019404368 A50 to T87 Transmission Control Module Upgrade (TCM) from XDP is designed to replace the failed TCM in your 2011-2014 GM 6.6L Duramax LML 4WD. The A50 and T14 TCM that is used to control the Allison 6-speed automatic transmission is typically considered the weak link of the Allison transmission. This is due to delicate thin wires inside the TCM that contact one another overtime and short-out the entire module. In 2022, Allison sent out a letter (SIL 15-1K2K-22) announcing the discontinuation of support for the A50 and T14 TCMs. This effectively leaves all 2009 to 2015 Duramax owners with no permanent solution or fix for their Silverado/Sierra 2500HD/3500HD. Some of the warning signs of a failing TCM are messages including “Service Brake System”, “Stabilitrak Service Required”, “Range Shift Inhibited”, “Service Brake System”, and "Loss Of Communication To The Transmission Control Module".