P1639 TCM internal Can 2 Ram Performance
P1639 code - Theori of operation the transmission control module (TCM) perform various internal tests to verify proper controller operation . This DTC indicates that there is an internal error with the controllers random access memory (RAM) on the CAN controller 2 section of the microprocessor. If detected, the controller will enter limp in mode and illuminate the Mil. When monitored this DTC continuously with the ignition on. Set condition this DTC if the TCM detects an internal error with the controllers random access memory (RAM) on the CAN controller 2 section of the microprcessor.
Possible cause P1639 code:
- Transmission control module (TCM)
Transmission control module (TCM)
Repair, using the schematics as a guide, check the transmission control module (TCM) 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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