Internal Control Module NVRAM Error
The non-volatile RAM (used for adaptive learning storage that survives key-off but is faster than EEPROM) reports a check-sum or write fault.
Affected components
- Ecu nvram
Common causes
- High likelihood: NVRAM check-sum failure
Possible symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.