Alternative Fuel Control Module RAM and ROM Error
The alternative fuel control module reports an internal RAM or ROM check failure - module no longer trustworthy.
Affected components
- Alternative fuel control module
Common causes
- High likelihood: Module internal memory 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- Low likelihood: Module software outdated, reflash may resolve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
- This code can affect emissions
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.