P2B46A Camshaft Position Actuator Position Sensor B Circuit High Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2B46 flags a signal from position sensor B on the bank 2 intake camshaft actuator that is stuck too high. Most often the sensor has lost its ground, the signal line has contact with a supply line, or the sensor element itself has failed. There is no public manufacturer description of P2B46; NTN-SNR lists it simply as inlet sensor B, second bank, signal too high. On engines like the Mercedes M176/M177, whose CAMTRONIC actuators have the sensor built in, replacing the actuator is the usual repair once the wiring checks out. With the feedback lost, the engine control keeps the cam lift in its default position, so drivers mostly notice the warning lamp and a little more fuel use. Bank 1 counterpart: P2B42.
- What you may notice
- Check engine light on
- Cam lift held in default position on bank 2
- Slightly increased fuel consumption
- Likely causes
- LikelySensor ground interrupted
- PossibleSignal line in contact with a supply line
- PossibleSensor element in the actuator failed
- 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: €60 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.