OBD-II code · Powertrain (generic, extended)
P25C2 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.
Is it safe to drive with P25C2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFeedback wire shorted to a B+ supply
- Less likelyPull-up resistor in the input stage failed
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Alt Fuel Control Module, Wiring Harness
Related codes
- P25BFAlternative Fuel Disable Control Circuit High
- P25C0Alternative Fuel Disable Control Circuit Low
- P25C1Alternative Fuel Disable Signal Circuit
- P25C3Alternative Fuel Disable Signal Circuit Low
- P25C4Brake Booster Temperature Sensor A Circuit
- P25C5Brake Booster Temperature Sensor A Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.