P2C5BCylinder 5 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
- P2C5B is the Max limit for injector B on cylinder 5, found on five-, six- and eight-cylinder engines. With two injection systems, one set may stay idle in parts of the map, and fuel left in a resting nozzle can varnish and slow the valve; the learned offset then climbs until it hits the ceiling. Ford builds such dual-injection V6 and V8 engines, yet its public OBD summaries for 2020 to 2025 list no offset-limit codes for injector B, and no other maker publishes P2C5B. The A-injector partner is P02D5. Before replacing parts, rule out a circuit fault on the same valve (P21D3) and reset the adaptations after any repair. CARB 1968.2 (e)(6.2.2) supplies the legal basis.
- What you may notice
- Check engine light
- Often nothing else noticeable
- Possibly uneven idle or lean misfire on cylinder 5
- Likely causes
- LikelyVarnish or deposits in injector B of cylinder 5, 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 5 (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.