Miscellaneous CPU Tests

Loss of Keep Alive Memory (KAM) power (a separate wire feeding the PCM) results is a P1633 DTC and immediate MIL illumination. (Used for those modules that use KAM.)

Vehicles that require tire/axle information and VIN to be programmed into the PCM Vehicle ID block (VID) will store a P1639 if the VID block is not programmed or corrupted.

P0602  - Powertrain Control Module Programming Error indicates that the Vehicle ID block check sum test failed.

P0603  - Powertrain Control Module Keep Alive Memory (KAM) Error indicates the Keep Alive Memory check sum test failed. (Used for those modules that use KAM.)

P0604  - Powertrain Control Module Random Access Memory (RAM) Error indicates the Random Access Memory read/write test failed.

P0605  - Powertrain Control Module Read Only Memory (ROM) Error indicates a Read Only Memory check sum test failed.

P0607  - Powertrain Control Module Performance indicates incorrect CPU instruction set operation, or excessive CPU resets.

P0610  - Powertrain Control Module indicates that one or more of the VID Block fields were configured incorrectly.

P068A  - ECM/PCM Power Relay De-energized - Too Early. This fault indicates that NVRAM write did not complete successfully after the ignition key was turned off, prior to PCM shutdown.

P06B8  - Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error indicates Permanent DTC check sum test failed

U0101  - Lost Communication with Transmission Control Module (for vehicles with standalone TCM)

P1934  - Lost Vehicle Speed Signal from ABS Module