P2B50
A Camshaft Profile Actuator B Control Performance/Stuck Off Bank 2
The control circuit of camshaft profile actuator B on the intake side of bank 2 reports a control performance/stuck off condition. Cam profile B (high-lift or VTEC-style) cannot be commanded reliably.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Common causes
Ordered by how often each turns out to be the cause.
- Actuator stuck in low-lift positionCommon
- Oil pressure to actuator insufficientPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- A Camshaft Profile Actuator B B2
- Wiring Harness
- ECM
P2B50 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.