P1631 TCM internal processor clock performance
P1631 code - Transmission control module (TCM) performs various internal tests to verify proper controller operation. This DTC indicates that there is an issue with the TCMs internal clock. If the TCM detects an error with the controller internal clock, the controller will enter limp-in mode and illuminate the MIL.
When monitored continuously with the ignition on. Set condition if the TCM detects an error with the controllers internal clock.
Possible causes:
- Transmission control module (TCM)
Transmission control module (TCM)
Repair, using the schematics as a guide, check the transmission control module terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM in accordance with the service information. Perform NAG1 Transmission Verification Test.
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