Aisin 81-40LE - Automatic Transmission (Non European Emissions)

DTC P0601 (Non European Emissions)

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0601 Transmission Control Module (TCM) Read Only Memory (ROM)

Conditions for Setting the DTC

The transmission control module (TCM) detects a difference between the calculated checksum data and rear checksum data.

Action Taken When the DTC Sets

The TCM will request the illumination of the hold lamp and store the DTC when the TCM detects a failure on the first ignition cycle.

Conditions for Clearing the DTC

* The TCM turns off the hold lamp when no further failures are detected on the next ignition cycles.
* The scan tool can clear the DTC from the TCM history.
* The TCM clears the DTC from the TCM history memory after 40 consecutive ignition cycles without fault.

Cause of Failure

* Harness or connector between TCM and engine control module (ECM)
* ECM
* TCM