51 PCM Memory Error

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Each time the PCM is powered up, several terminal tests are performed on the random access memory (RAM), electronically programmable read only memory (EPROM) and electronically erasable/programmable read only memory (EEPROM). If there is a fault in one or more of these, Code 51 will set.

Code Parameters

Code 51 will set if:

  • The PCM memory is malfunctioning.

Diagnostic Aids

  • Code 51 indicates an internal PCM/EC malfunction. The PCM should be replaced.

Supplemental Note

If you are hacking your PCM, and this code pops up, most likely you didn't set a checksum correctly. The RAM is checked with a simple write/read command, and the EEPROM and EPROM are checksumed and checked with what is stored.