P2C5FCylinder 7 Fuel Injector B Offset Learning At Max Limit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2C5F, again a V8 code, flags injector B of cylinder 7 whose learned offset is pinned at its maximum. A point often missed is the learn history: when an injector is replaced or software changes, old adaptation values can sit at the limit until they are cleared. Volvo, for example, insists on resetting the injector adaptations with the engine running after its software update for the related four-cylinder codes. If the code returns after a reset and a full learn, the valve really underdelivers: varnish in the nozzle, a slow pintle or a poor connection. Comparing with the A-injector partner P02D9 shows whether only the B side is affected. No manufacturer publishes P2C5F; CARB 1968.2 (e)(6.2.2) defines the requirement.
- What you may notice
- Check engine light
- Often nothing else noticeable
- Possibly uneven idle or lean misfire on cylinder 7
- Likely causes
- LikelyVarnish or deposits in injector B of cylinder 7, slow opening
- PossibleCorroded or loose connector, chafed wire or voltage drop at this injector
- PossibleOld adaptation values left at the limit after a repair or software change
- RareAir leak at the intake runner of cylinder 7 (only where the learn uses exhaust oxygen)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.