Powertrain, generic (extended)

P268A Fuel Injector Calibration Not Learned/Programmed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Injector quantity learn not completed after injector or controller replacement
Engine control software fault (e.g. Audi 2.0 TFSI 2025–2026)
Rail pressure deviation preventing correct learning
Injector worn beyond the correction range

Symptoms

  • Check engine light on
  • Rough idle or louder combustion noise
  • Often no noticeable change in driving

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–500
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorscontrol module

Related codes

P268BP2696P262AP0087P0088

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.