Powertrain
generic or reserved
P34BF
B Camshaft Position Actuator Position Sensor A Circuit High Bank 1
Cam actuator B position sensor on bank 1 signal voltage above expected range. The camshaft position sensor identifies which cylinder is on the compression stroke — without it the ECM cannot run sequential injection or coil-on-plug ignition correctly.
SystemPowertrain
Typegeneric or reserved
GroupP3
Range / number4 / BF
Possible causes
- Signal wire open high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.5–3 h
- Component: cam actuator b pos sensor b1
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012