P2E6BSystem Too Rich During Cylinder Deactivation Bank 2
- 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
- P2E6B closes the set: bank 2 runs rich while cylinders are switched off. GM's 19OBDG07 tables (4.2-litre twin-turbo V8, LTA) fail the test when bank 2's deactivation-mode trim factor falls below 0.77 and has settled; Type B, two trips, same enable conditions as the other three codes. Typical systems keep the valves of the idle cylinders shut and stop fuelling them, so the shut cylinders act as air springs; if a valve or injector of a cylinder that should be off keeps working, measured air and real air per firing cylinder no longer match. Compared with P2E69 the fault sits on the other bank; a rich result on both banks suggests a common source such as purge vapour or fuel-diluted oil. GM calls the system Active Fuel Management.
- What you may notice
- Check engine light after two trips
- Higher fuel consumption on the highway
- Possible sooty tailpipe on bank 2 side
- Likely causes
- LikelyLeaking injector on bank 2, including one on a cylinder that should be shut off
- PossibleDeactivation rocker or its oil-control solenoid not switching on one cylinder
- PossibleExcess purge vapour or fuel-diluted engine oil
- RareBank 2 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.