P02DACylinder 8 Fuel Injector A Offset Learning At Min 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
- The engine module learns a small-quantity correction for each injector: on overrun it gives one injector a tiny test injection (GM about 1.5 mm³), measures the resulting crankshaft acceleration and corrects the injector's activation time per rail pressure step. P02DA means the learned correction for cylinder 8 has reached its lower limit at at least one pressure step: the injector needs much less activation time than nominal – it delivers too much at small quantities or opens early. GM diesels set it at limits of roughly ±66–182 µs after two trips. It is documented on GM's 6.6 litre L5P diesel and on Land Rover's 5.0 V8 petrol, where a software update is the first step. It differs from P01DA (over advanced), which some systems derive from the same learning.
- What you may notice
- Check engine light on
- Often nothing noticeable; possibly rough idle or knocking
- Possibly smoke or higher consumption
- Likely causes
- LikelyInjector of cylinder 8 leaking or over-delivering at small quantities
- PossibleEngine software (update available for some models)
- PossibleInjector correction code not or wrongly programmed after replacement
- RareDisturbed crankshaft signal (worn drive belt, tone wheel, dual-mass flywheel)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · 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.