Control Module Performance
The ECM performs an internal self-test and detects a processor or memory performance fault that does not fit the more specific P0601 to P0606 codes.
Affected components
- Ecm
Common causes
- High likelihood: ECM internal performance fault
- Medium likelihood: Unstable supply voltage
- Low likelihood: Module software outdated, reflash may resolve
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
- This code can affect emissions
- Reduced-power or limp mode may occur
Related codes
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.