OBD-II code · Powertrain (generic, extended)
P25C1 Alternative Fuel Disable Signal Circuit
The feedback signal that confirms the alt-fuel disable command was carried out is missing or out of range. The fuel system cannot verify that the gas circuit is shut.
Is it safe to drive with P25C1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen feedback wire between relay and control module
- PossibleFeedback contact in the disable relay corroded or stuck
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Alt Fuel Control Module, Feedback Sensor, Wiring Harness
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.