Alternative Fuel Disable Signal Circuit High
The disable feedback signal sits above its valid window. Typical cause is a short to battery on the feedback wire or a failed pull-up in the input stage.
Affected components
- Alt fuel control module
- Wiring harness
Common causes
- High likelihood: Feedback wire shorted to a B+ supply
- Low likelihood: Pull-up resistor in the input stage failed
- 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.