Alternative Fuel Disable Control Circuit Low
Voltage on the alternative-fuel disable control line is below the expected window. Usually a short to ground or a failed driver pulling the line low.
Affected components
- Alt fuel control module
- Wiring harness
Common causes
- High likelihood: Disable control wire shorted to ground
- Medium likelihood: Low-side driver internally shorted
- Low likelihood: Connector pins corroded - high contact resistance
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.