Code result
P25BE
Alternative Fuel Disable Control Circuit / Open
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Broken wire or corroded connector on the disable control line
highOne of the most commonly reported causes for this code — check this first.
Open coil in the alt-fuel disable relay
mediumA plausible cause — test and verify before replacing parts.
Output driver in the alt-fuel control module faulty
lowLess common, but worth ruling out after the more likely causes.
Related help
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