OBD-II code · Powertrain (generic, extended)
P2651 B Rocker Arm Actuator System Performance/Stuck Off Bank 1
The rocker arm actuator B on bank 1 is commanded to engage but does not switch. Engine stays in the wrong lift or cylinder mode under load.
Is it safe to drive with P2651?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyLow oil pressure cannot move the actuator
- PossibleMechanical lock pin stuck in unactivated position
- Less likelyCarbon or debris buildup preventing free movement
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Rocker Arm Actuator B B1, Oil Control Valve, Oil Supply
Related codes
- P2646A Rocker Arm Actuator System Performance/Stuck Off Bank 1
- P2656A Rocker Arm Actuator System Performance/Stuck Off Bank 2
- P2661B Rocker Arm Actuator System Performance/Stuck Off Bank 2
- P264EA Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 1
- P264FEngine Serial Number Not Programmed or Incompatible
- P2650B Rocker Arm Actuator Control Circuit / Open Bank 1
- P2652B Rocker Arm Actuator System Stuck On Bank 1
- P2653B Rocker Arm Actuator Control Circuit Low Bank 1
- P2654B Rocker Arm Actuator Control Circuit High Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.