OBD-II code · Powertrain (generic, extended)
P25C3 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.
Is it safe to drive with P25C3?
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 ground
- Less likelyOpen pull-up resistor in the controller input
- 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
- P25C0Alternative Fuel Disable Control Circuit Low
- P25C1Alternative Fuel Disable Signal Circuit
- P25C2Alternative Fuel Disable Signal Circuit High
- P25C4Brake Booster Temperature Sensor A Circuit
- P25C5Brake Booster Temperature Sensor A Circuit Range/Performance
- P25C6Brake Booster Temperature Sensor A Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.