Powertrain, generic (extended)

P2B52 B Camshaft Profile Actuator B Control Performance/Stuck Off Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Actuator B of the bank 2 exhaust camshaft does not extend its pin
Poor contact at the actuator connector or heat-damaged harness
Engine control calibration that judges the shift too strictly

Symptoms

  • Check engine light on
  • Exhaust lift switching inactive on bank 2
  • Possibly slightly lower power in the upper speed range

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–800
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

b camshaft profile actuator b b2wiring harnessecm

Related codes

P2B56P2B51P2B50P2B3CP005C

References: ntn-snr.com, law.cornell.edu, static.nhtsa.gov.