P2B43A Camshaft Position Actuator Position Sensor B Circuit 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
- P2B43 covers the wiring of sensor B at the bank 2 intake actuator, i.e. on the cylinder bank without cylinder 1, so it only appears on V or boxer engines. The engine module sees an open line or a signal it cannot accept at all. On Mercedes V8s with CAMTRONIC (M176/M177) the intake actuator of bank 2 is exactly where bulletin LI05.20-P-080192 places the sister fault P2B44; the same bulletin asks technicians to check the harness above the bulkhead for heat damage, which fits a circuit code as well. P2B43 itself is not described in any public manufacturer document. CARB demands that every sensor of a variable valve system is monitored for circuit faults. Bank 1 counterpart: P2B3F.
- What you may notice
- Check engine light on
- Cylinder deactivation or lift change switched off
- Possibly limp-home message of the valve-lift system
- Likely causes
- LikelyHarness near the bulkhead damaged by heat
- PossibleActuator connector loose or corroded
- PossibleSensor in the actuator failed
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.