P34BCB Camshaft Position Actuator Position Sensor A Circuit 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
- P34BC means the module cannot make sense of the wiring of sensor A, which reports where actuator B on bank 1 stands. Read against the NTN-SNR list, actuator B is the exhaust-side one. Where such actuators are electric, sensor A reports the motor or phaser angle; Mitsubishi shows the intake equivalent P34AC, set after a voltage outside the window for one second or more. Mercedes-Benz files the feedback of its CAMTRONIC exhaust solenoid on its M176/M177 eight-cylinder units in this very group, yet its bulletin lists only the range and low codes P34BD and P34BE, not the general circuit code. No public source covers P34BC itself, so diagnosis stays generic: unplugged connector, broken wires, missing sensor supply, then the actuator. Bank 2 counterpart: P34C0.
- What you may notice
- Malfunction indicator lamp lit
- Exhaust-side adjustment on bank 1 switched off
- Possibly slightly higher fuel consumption
- Likely causes
- LikelyConnector at the exhaust actuator unplugged or corroded, wire broken
- PossibleSensor supply or ground missing
- PossibleSensor integrated in the actuator failed (actuator replacement)
- 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.