Alternative Fuel Disable Signal Circuit Low
The disable feedback signal sits below its valid window. Usually a short to ground or an open pull-up that lets the input float low.
Affected components
- Alt fuel control module
- Wiring harness
Common causes
- High likelihood: Feedback wire shorted to ground
- Low likelihood: Open pull-up resistor in the controller input
- 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.