Internal Control Module Main Processor Performance
The ECU main processor self-diagnosis flagged a performance fault - watchdog, ROM check, or instruction-set self-test failed. Engine runs on safety strategy.
Affected components
- Ecu main processor
Common causes
- High likelihood: Main processor internal fault
- Low likelihood: Module software outdated, reflash may resolve
- Low likelihood: Supply voltage outside specification
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.