P2B41A Camshaft Position Actuator Position Sensor B Circuit Low 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
- P2B41 reports a voltage below the permitted window from sensor B, which watches the intake actuator of bank 1. That usually points to a grounded signal line or a sensor that has failed internally. Mercedes describes the matching low fault on the exhaust side (P34BE, sensor of CAMTRONIC solenoid 1) literally as a short to ground, which shows how the family is meant; a public text on P2B41 itself is not known. GM's L3B, used here only as a comparison, sets its low codes on the sliding cam (P2C07) at 0.5 Ω or less between signal and ground while the driver is on, after 4 of 5 samples with more than 11 V supply. Chafed harness sections over the cylinder head deserve the first look. High is P2B42.
- What you may notice
- Check engine light on
- Cam lift switching disabled
- Possibly further codes from sensors on the same supply
- Likely causes
- LikelySignal wire shorted to ground (chafed harness)
- PossibleSensor shorted internally
- PossibleSensor supply interrupted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.