Replacement TCMs don’t come with trim data

Bulletin number

ATS-151101 V2

Component

Power train: automatic transmission: control module (TCM/PCM/tecm)

Summary

Replacement TCMs don’t come with trim data. After installation, you need to run a teach-in (hydraulic pressure characteristic calibration) procedure with the HDS. The problem is that A/T DTC P287C (transmission adaptive values not learned) is set, which prevents teach-in. This happens because the TCM is programmed to look for trim data any time the ignition is cycled. If the TCM doesn’t see that trim data, it sets A/T DTC P287C. If any DTCs are set, the TCM won’t initiate teach-in and, as a result, can’t learn the trim data. It’s a classic catch-22 situation.

Owners of these vehicles have filed 202 complaints in the transmission category.