P268AFuel Injector Calibration Not Learned/Programmed
- 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
- P268A covers injector correction that relies on a learn routine rather than a printed code. GM's diesel tables 17OBDG04 to 19OBDG04A set it, Type A in one trip, when the small quantity learning (SQL) routine was not completed and stored before the vehicle left the assembly line. VW's 2014 Touareg 3.0 TDI (CNRB) lists it for a rail pressure deviation above 1,500–2,000 kPa lasting over 40 s. Audi's 2026 service note 2082225/1 reports it with the MIL on 2025–2026 A5 and Q5 2.0 TFSI petrol engines as a software issue. Deutz MD1 links it to a calibration fault of injector 1. Per-injector code faults use P268C–P2696. Symptoms range from none to rough idle and knock.
- What you may notice
- Check engine light on
- Rough idle or louder combustion noise
- Often no noticeable change in driving
- Likely causes
- LikelyInjector quantity learn not completed after injector or controller replacement
- PossibleEngine control software fault (e.g. Audi 2.0 TFSI 2025–2026)
- RareRail pressure deviation preventing correct learning
- RareInjector worn beyond the correction range
- 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: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.