OBD-II code · Powertrain (generic, extended)
P2B51 B Camshaft Profile Actuator B Control Performance/Stuck Off Bank 1
The control circuit of camshaft profile actuator B on the exhaust side of bank 1 reports a control performance/stuck off condition. Cam profile B (high-lift or VTEC-style) cannot be commanded reliably.
Is it safe to drive with P2B51?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyActuator stuck in low-lift position
- PossibleOil pressure to actuator insufficient
- Less likelyCarbon or debris buildup preventing free movement
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- B Camshaft Profile Actuator B B1, Wiring Harness, Ecm
Related codes
- P003CA Camshaft Profile Actuator A Control Performance/Stuck Off Bank 1
- P003EA Camshaft Profile Actuator A Control Performance/Stuck Off Bank 2
- P005AB Camshaft Profile Actuator A Control Performance/Stuck Off Bank 1
- P005CB Camshaft Profile Actuator A Control Performance/Stuck Off Bank 2
- P2B4FA Camshaft Profile Actuator B Control Performance/Stuck Off Bank 1
- P2B50A Camshaft Profile Actuator B Control Performance/Stuck Off Bank 2
- P2B52B Camshaft Profile Actuator B Control Performance/Stuck Off Bank 2
- P2B4EB Camshaft Position Actuator Position Sensor B Circuit High Bank 2
- P2B53A Camshaft Profile Actuator B Control Stuck On Bank 1
- P2B54A Camshaft Profile Actuator B Control Stuck On Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.