P2B45A Camshaft Position Actuator Position Sensor B Circuit Low 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
- P2B45 means the bank 2 intake actuator's position sensor B delivers an unusually low voltage – on bank 2, which a V engine places opposite cylinder 1. A grounded signal wire is the classic cause; an internally shorted sensor or a missing supply gives the same picture. Mercedes words the low faults of this family on CAMTRONIC V8s as a ground short (P34BE and P34C2, exhaust sensor A), though P2B45 itself appears in no public manufacturer text. Because the Mercedes bulletin on these engines found heat-damaged harnesses behind the engine, that area belongs on the check list. CARB requires out-of-range low signals of such sensors to be detected. Circuit High on the same bank is P2B46.
- What you may notice
- Check engine light on
- Lift change on bank 2 stops working
- Possibly limp-home message
- Likely causes
- LikelySignal wire grounded through chafing or heat damage
- PossibleSensor in the actuator shorted
- RareSupply to the sensor missing
- 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.