OBD-II code · Powertrain (generic, extended)
P25A8 Fuel Mode Select Switch Circuit Intermittent/Erratic
Fuel mode switch signal jumps or drops out — worn contact or vibration. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P25A8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWorn switch contact
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Mode Switch
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.