P2E6ASystem Too Lean 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
- P2E6A applies the lean test to bank 2, the cylinder row without cylinder 1. GM sets it on the 4.2-litre twin-turbo V8 of the 2019 table 19OBDG07 when the trim factor learned for deactivation mode on bank 2 exceeds 1.23 while stable; Type B. The engine closes the valves of four cylinders and fires in the order 1-4-6-7, so on GM's odd/even bank split only cylinders 4 and 6 keep working on bank 2, and a single weak injector there weighs heavily. A separate camshaft-driven high-pressure pump feeds each bank, so a pump problem can also stay on one side. CARB requires the fuel system to be watched for any fault that pushes emissions over the limits. A lean trim on both banks during deactivation points to a shared cause such as an intake leak.
- What you may notice
- Check engine light after two trips
- Hesitation at light load in deactivation mode
- Often no noticeable change in normal driving
- Likely causes
- LikelyWeak injector on cylinder 4 or 6, which carry bank 2 in deactivation mode
- PossibleBank 2 high-pressure fuel pump delivering too little
- PossibleDeactivating rocker on bank 2 letting air pass into the exhaust
- RareExhaust leak ahead of the bank 2 oxygen sensor
- 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.