P2B42A Camshaft Position Actuator Position Sensor B Circuit High 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
- Here sensor B of the bank 1 intake actuator reports a value stuck above its upper limit. Typical reasons are an open sensor ground, a signal line touching 5 V or battery voltage, or a defective sensor. No manufacturer explains P2B42 publicly; the supplier list from NTN-SNR only names it as the inlet-side sensor B with a signal that is too high. GM measures the related sliding-cam circuits of its L3B (P2C08) for contact with supply voltage while the output is switched off, again at 0.5 Ω and 4 of 5 samples, and lights the MIL on the first trip – a comparison, not a statement about this code. On Mercedes CAMTRONIC engines the sensor sits in the actuator, so a failed sensor means replacing the actuator. Low is P2B41.
- What you may notice
- Check engine light on
- Intake lift change locked out
- Usually no noticeable change in driving, sometimes reduced power
- Likely causes
- LikelySensor ground open or connector corroded
- PossibleSignal wire shorted to 5 V or battery voltage
- PossibleSensor (actuator) faulty
- 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.