ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error

DTC P0603: ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error




General Description
The engine control module (ECM)/powertrain control module (PCM) is equipped with a keep-alive memory. The data (control learn data etc) for powertrain control and information (Vehicle Identify Number (VIN) etc) related to the vehicle control is stored in the keep alive memory, so that it can be maintained even when the power is not supplied to the ECM/PCM such as when the battery is disconnected. When the power is restored to the ECM/PCM, the CPU retrieves the stored information from the keep alive memory, but when the data retrieval process is not finished normally, a malfunction is detected and a DTC is stored.

The CPU writes data to the keep-alive memory from the CPU: Control related data is written when the ignition is turned on, and vehicle information when commanded from the scan tool.

If the data writing process is not completed normally, a malfunction is detected and a DTC is stored.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
A malfunction is detected whenever the keep alive data retrieval and writing process is not completed normally.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the ECM/PCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.