P2654"B" Rocker Arm Actuator Control Circuit High (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2654 reports a voltage that is too high on the wire that drives rocker solenoid B, bank 1, typically when the line touches a battery-fed wire or the driver's ground side is bridged. With a ground-switched solenoid, that kind of short can energise the valve permanently, so the B stage may stay engaged regardless of the command, which the engine feels as rough idle or misfire at low speed. No carmaker publishes this code with details. GM checks the matching A circuit (P2649) on its 2015 four-cylinders using an output test that needs at least 11 V and declares a Type A fault once 100 of 120 checks fail. CARB counts a short to power among the circuit faults a lift system must catch. Related: P2653 for the low side, P2650 for an open circuit, P2664 on bank 2.
- What you may notice
- MIL on
- Rough idle or misfire if the B stage stays engaged
- Possible blown fuse on the solenoid supply
- Likely causes
- LikelySolenoid B control wire shorted to a battery-fed circuit
- PossibleInternal short in solenoid B lowering its resistance
- RareShorted output transistor in the engine control module
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.