P2B52B Camshaft Profile Actuator B Control Performance/Stuck Off 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
- P2B52 is the bank 2 version for actuator B on the exhaust camshaft (B): the second shifting solenoid either does not move its cam sleeve or remains in the off position. No manufacturer documents this exact code publicly. NTN-SNR lists it in its camshaft sensor guide as actuator never active, and CARB 13 CCR 1968.2 (e)(13) requires valve control systems to be checked for failure to reach the commanded state. The closest documented analogue is Mercedes P005C on the M176/M177 V8, where exhaust solenoid 1 of bank 2 is reported faulty or jammed off (LI05.20-P-080192). Expect the exhaust lift profile to stay fixed on that bank. Bank 1 is P2B51, stuck on is P2B56, wiring faults are P2B3C–P2B3E.
- What you may notice
- Check engine light on
- Exhaust lift switching inactive on bank 2
- Possibly slightly lower power in the upper speed range
- Likely causes
- LikelyActuator B of the bank 2 exhaust camshaft does not extend its pin
- PossiblePoor contact at the actuator connector or heat-damaged harness
- RareEngine control calibration that judges the shift too strictly
- 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 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.