Powertrain
generic / SAE
P25BF
Alternative Fuel Disable Control Circuit High
Voltage on the alternative-fuel disable control line is above the expected window. Often a short to battery upstream of the relay or a stuck-on driver in the control module.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / BF
Possible causes
- Disable control wire shorted to a B+ supply high
- Output driver stuck on inside the control module medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–500 €
- Estimated time: 0.8–2 h
- Component: alt fuel control module
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012