P2663"B" 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
- P2663 is stored when the control line to solenoid B on bank 2 reads too low, most often a short to ground somewhere between the module and the second cylinder head. On V engines that harness branch often runs along the back of the block or under the intake manifold, where heat and vibration wear through insulation. A coil whose resistance has collapsed gives the same picture. No carmaker documents P2663 publicly with thresholds. The principle can be seen in GM's 15OBDG05 table for 2015 four-cylinders on the matching actuator A circuit, with 100 failures in 120 samples above 11 V triggering a Type A fault. CARB counts circuit shorts among the faults to be caught. Many drivers switch off for protection, leaving stage B on that bank idle. Bank 1 equivalent: P2653.
- What you may notice
- MIL on
- Stage B on bank 2 out of action, power or economy reduced
- Likely causes
- LikelyBank 2 control wire worn through and touching ground
- PossibleBank 2 solenoid B coil with collapsed resistance
- RareFaulty output driver for bank 2 solenoid B
- 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: €50 – €550
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.