Chrysler
Type:
    Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Description:
    PCM Internal Fault, SPI Communications Conditions
Cause:
    Key on or engine running, then the PCM detected that the serial communications inside the controller failed 8 times Prior to replacing the PCM, inspect the PCM terminals for a shorted, grounded or open circuit condition

Generic
Type:
    Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Description:
    Internal Control Module Memory Check Sum Error

GM
Type:
    Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Description:
    Control Module ROM Fault Conditions
Cause:
    Key in crank or run position, then the PCM detected during a self-check that it detected more than 3 incorrect checksums • Refer to code repair chart for instructions on how to replace a PCM or how to reprogram the replacement unit