OBD-II code · Powertrain (generic, extended)
P25BE Alternative Fuel Disable Control Circuit / Open
The controller cannot drive the alternative-fuel disable line that switches a bi-fuel vehicle (CNG, LPG, hydrogen) back to gasoline. An open detected on the control side blocks the safety shutoff for the gas system.
Is it safe to drive with P25BE?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBroken wire or corroded connector on the disable control line
- PossibleOpen coil in the alt-fuel disable relay
- Less likelyOutput driver in the alt-fuel control module faulty
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, Alt Fuel Disable Relay, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.