What are the common causes of P25BF?

An open in the alternative fuel disable control signal wire. A failed alternative fuel disable solenoid or relay. A loose or corroded connector on the disable control circuit. A missing ground at the alternative fuel disable device.

Read alternative fuel disable control status on a scan tool. Test the disable control signal wire for an open. Check the disable solenoid or relay for correct operation. Inspect the circuit connectors for corrosion or looseness. Replace the alternative fuel disable control solenoid if the circuit tests good. Clear the code and retest.

P25BF

Alternative Fuel Disable Control Circuit High

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P25BF means Alternative Fuel Disable Control Circuit High.

Check these first

An open in the alternative fuel disable control signal wire
A failed alternative fuel disable solenoid or relay
A loose or corroded connector on the disable control circuit
A missing ground at the alternative fuel disable device

What to do next

Read alternative fuel disable control status on a scan tool
Test the disable control signal wire for an open
Check the disable solenoid or relay for correct operation
Inspect the circuit connectors for corrosion or looseness
Replace the alternative fuel disable control solenoid if the circuit tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.