P2653"B" Rocker Arm Actuator Control Circuit Low (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
- P2653 points to a voltage that is too low on the control line of rocker arm solenoid B, bank 1. On a solenoid switched from the supply side, a line rubbing against the engine block or a shorted coil pulls the signal down while the output is active; the controller's driver then reports an overcurrent or a low-voltage state. No manufacturer documents this code publicly. For actuator A, GM's 15OBDG05 runs the same kind of driver diagnosis on its 2015 four-cylinders above 11 V, with a fault after 100 of 120 samples and the MIL on at once. CARB treats such shorts as circuit faults that every lift system output must detect. Many drivers shut down to protect themselves, so the B stage drops out. P2650 covers an open, P2654 a short to power.
- What you may notice
- MIL on soon after the fault appears
- B stage switched off, reduced power or economy
- Likely causes
- LikelyControl wire of solenoid B shorted to engine ground
- PossibleShorted turns inside the solenoid B coil
- RareEngine oil inside the connector creating a leakage path
- 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 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.