P2658"A" Rocker Arm Actuator Control Circuit Low (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2658 flags the bank 2 control line of rocker arm actuator A as too low, the classic sign of a short to ground or a coil with damaged windings. The test is purely electrical and runs whenever the controller drives the output, regardless of oil condition. No manufacturer documents P2658 publicly; GM's equivalent for bank 1 (P2648 in 15OBDG05) needs more than 11 V and 100 failures out of 120 samples, Type A. Inspect the bank 2 solenoid connector, harness clips near the exhaust manifold and the coil resistance. If only one bank can switch, the controller may disable the feature altogether, leaving reduced power or economy.
- What you may notice
- MIL on immediately
- Lift switching disabled
- Less power or higher consumption
- Likely causes
- LikelyBank 2 control wire shorted to ground
- PossibleDamaged winding in the bank 2 solenoid
- RareHarness insulation damaged by exhaust heat
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.