P2B3FA 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
- P2B3F is the general circuit code for position sensor B of the intake camshaft actuator (camshaft A) on bank 1, the side with cylinder 1; the NTN-SNR sensor guide also places it on the inlet side. Mercedes-Benz uses this code family on its M176/M177 V8 engines, where each CAMTRONIC lift actuator reports its own sensor signal and sensor B belongs to solenoid 2. No manufacturer documents P2B3F itself publicly. For comparison, GM's 2.7-litre L3B judges the feedback circuits of its sliding-cam actuators (P2C05 ff) as open once it sees 200 kΩ or more between signal and ground in 4 of 5 samples, Type A. Expect a broken wire, a loose plug or a failed sensor; the engine control then locks out the lift change. Low and High faults have their own codes, P2B41 and P2B42.
- What you may notice
- Check engine light on
- Lift switching or cylinder deactivation unavailable
- Slightly higher consumption, sometimes less power
- Likely causes
- LikelyConnector at the actuator loose, corroded or wire broken
- PossiblePosition sensor in the actuator failed (actuator replacement)
- PossibleEngine harness damaged by heat or chafing
- 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.