P25A5Fuel Mode Select Switch Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P25A5 flags a performance problem with the fuel mode select switch. The circuit is electrically sound, yet the switch behaves in a way that cannot be genuine, such as a momentary button that appears to be held down for minutes or a press that never returns to rest. On GM's bi-fuel trucks the chosen mode is kept across key cycles and each press toggles the fuel, so a stuck contact would keep requesting changes; GM's material on the bi-fuel Impala of 2015 notes that the switch light flashes while a fuel transition is under way. No manufacturer documents P25A5 publicly. Likely culprits are spilt drinks in the centre stack, a cap jammed after trim work or a switch from the wrong variant. The driver may lose manual fuel selection while the engine runs on.
- What you may notice
- Fuel mode changes by itself or not at all
- Switch indicator keeps flashing
- Likely causes
- LikelySwitch button sticking or contaminated by liquid
- PossiblePanel trim pressing on the switch after installation work
- RareReplacement switch of the wrong type or coding
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.