P2B49
B Camshaft Position Actuator Position Sensor B Circuit Low Bank 1
The position sensor B of the camshaft position actuator on the exhaust side of bank 1 reports a circuit low condition. Cam phasing position cannot be measured 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.
- Signal wire shorted to groundCommon
- Internal sensor shortPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- B Camshaft Position Actuator Pos Sensor B B1
- Wiring Harness
- ECM
P2B49 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.