P2649"A" 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
- The counterpart to P2648: the control circuit of rocker arm actuator A on bank 1 reads high, which means a short to battery voltage or a driver that cannot pull the line down. In GM's 2015 table 15OBDG05 the check needs the output driver commanded on, ignition in crank or run and supply above 11 V; 100 failures in 120 samples set a Type A fault. The Honda V6 (L66) in GM's 2004 table looks at the opposite situation: with the VTEC solenoid commanded off, a return signal at 12 V lasting 2 s points to a high circuit. A harness shorted to a power feed or an internal controller fault are the usual suspects; the actuator can then stay energised or be shut down by the controller.
- What you may notice
- MIL on immediately
- Lift switching disabled or permanently active
- Rough running at idle if the actuator stays energised
- Likely causes
- LikelyControl wire shorted to a battery or ignition feed
- PossibleOutput driver in the engine controller no longer switches
- RareOpen ground side of the solenoid circuit
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.