P34BFB Camshaft Position Actuator Position Sensor A Circuit High Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P34BF: on bank 1, sensor A of the camshaft B actuator, i.e. the exhaust side, sends more voltage than allowed. An open ground, a signal wire in contact with a feed or an internally open sensor are the usual explanations. Mercedes-Benz documents low and implausible signals for this sensor on its CAMTRONIC V8 (P34BE, P34BD), but no high fault; other manufacturers do not mention the code either. On Mitsubishi's electric intake phaser the matching high code P34AF parks the motor in its reference position, and an electric exhaust actuator would presumably react in a similar way. CARB counts the sensors of a VVT system among the comprehensive components, whose out-of-range values must be detected. Low on bank 1: P34BE; high on bank 2: P34C3.
- What you may notice
- Malfunction indicator lamp lit
- Exhaust adjustment on bank 1 kept in its reference position
- Likely causes
- LikelySensor ground interrupted or plug corroded
- PossibleSignal line shorted to a supply wire
- PossibleSensor in the exhaust actuator open internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.