P2E69System Too Rich During Cylinder Deactivation Bank 1
- 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
- P2E69 is the rich mirror of P2E68: with cylinders deactivated, bank 1 has to pull fuel out beyond the permitted range. In GM's 19OBDG07 tables for the 4.2-litre twin-turbo V8 the separate long-term trim factor learned for deactivation mode must drop below 0.77 and stay steady; it shares the enable logic of P2E68 and is Type B, MIL on the second trip. A Ford patent on variable displacement V8s shows how such a rich shift arises: if one cylinder fails to deactivate, air blows through it, the airflow meter reports more air, fuel rises accordingly, and the bank that is working normally runs rich. A leaking injector on a firing cylinder or a fuel-diluted crankcase can do the same. The running-mode rich codes are separate.
- What you may notice
- Check engine light after two trips
- Higher fuel use, possible fuel smell
- Rough running in deactivation mode
- Likely causes
- LikelyA cylinder that should be off still breathing, so measured airflow and fuel delivery are too high
- PossibleLeaking or dribbling direct injector on bank 1
- PossibleFuel vapour from diluted oil or a stuck-open purge valve
- RareBank 1 oxygen sensor reading biased lean
- 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: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.