Ford
Type:
    Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Description:
    PCM Keep Alive Memory Test Error Conditions
Cause:
    Key on, then the PCM detected an internal memory fault This code can be set if KAPWR to the PCM is interrupted The code will set the first time at initial key on

Generic
Type:
    Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Description:
    Internal Control Module Keep Alive Memory (KAM) Error

GM
Type:
    Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Description:
    Control Module Long Term Memory Reset Conditions
Cause:
    DTC P0604 not set, key on, then the PCM determined that its calculated checksum that did not match a previous checksum • Refer to code repair chart for instructions on how to replace a PCM and how to reprogram the replacement