Transmission Diagnosis

DTC P0601 (3.0L)

Circuit Description
A normal function of the Transmission Control Module (TCM) is to perform an internal test that verifies the integrity of the ROM memory allocation. This diagnostic detects faults in the allocation of flash memory that contains the program and calibration by comparing a calculated check-sum with a stored check-sum. When the TCM detects that the calculated check-sum is different from the stored check-sum, DTC P0601 sets. DTC P0601 is a type A DTC.

Conditions for Running The DTC
The ignition is ON.

Conditions for Setting The DTC
The TCM EEPROM check-sums do not match.

Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the Malfunction Indicator Lamp (MIL).
^ The TCM commands maximum line pressure.
^ The TCM freezes transmission adaptive functions.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0601 in TCM history.

Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the default actions when the ignition switch is OFF long enough in order to power down the TCM.

Steps 1 - 5:

DTC P0601 (3.0L)