P2B47B Camshaft Position Actuator Position Sensor B 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
- P2B47 moves the circuit fault to the exhaust side: it concerns position sensor B on the actuator of camshaft B, bank 1. NTN-SNR's supplier code list reads camshaft B as the outlet camshaft. Mercedes-Benz, in its CAMTRONIC bulletin for the M176/M177 V8, documents exhaust-side feedback faults only for sensor A of solenoid 1 (P34BD, P34BE); a second exhaust sensor and P2B47 itself are not documented publicly by any manufacturer. The comparable GM L3B judges an exhaust sliding-cam feedback circuit (P2C12) as open from 200 kΩ upward, 4 of 5 samples, MIL on the first trip. Look for an unplugged or corroded connector and broken wires first. The intake-side counterpart on bank 1 is P2B3F.
- What you may notice
- Check engine light on
- Exhaust cam lift change unavailable
- Little change in driving behaviour
- Likely causes
- LikelyConnector unplugged or corroded, wire broken
- PossibleExhaust actuator sensor failed
- RareEngine control module fault
- 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 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.