OBD-II code · Powertrain (generic, extended)
P25C0 Alternative Fuel Disable Control Circuit Low
Voltage on the alternative-fuel disable control line is below the expected window. Usually a short to ground or a failed driver pulling the line low.
Is it safe to drive with P25C0?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDisable control wire shorted to ground
- PossibleLow-side driver internally shorted
- 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
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.