Non Europe or N. American Emissions
DTC P0601 or P1790 (Non Europe or N. American Emissions)
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0601 or P1790 System Voltage Low
Conditions for Setting the DTC
The transmission control module (TCM) detects a difference between the calculated checksum data and the 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
* The harness or connector between the TCM and the engine control module (ECM)
* The ECM
* The TCM
