P2B3A
B Camshaft Profile Actuator B Control Circuit Low Bank 1
The control circuit of camshaft profile actuator B on the exhaust side of bank 1 reports a control circuit low 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.
- Control wire shorted to groundCommon
- Internal short in actuator coilPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- B Camshaft Profile Actuator B B1
- Wiring Harness
- ECM
P2B3A 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.