Powertrain, generic (extended)

P2B54 A Camshaft Profile Actuator B Control Stuck On Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P2B54 actuator B, the second shifter on the bank 2 intake camshaft, is reported as stuck on, meaning its pin or valve stays engaged after the command to release. A public manufacturer description of this exact code was not found. GM's L3B tables show how the bank 1 twin, P2B53, is judged: the Hall feedback must return to the retracted level within the engine cycle, otherwise a stuck pin is assumed. NTN-SNR describes P2B54 as component permanently active, and CARB requires valve control faults of this kind to be detected under (e)(13). On a V-engine only one bank would then run the wrong intake lift, which can cause uneven running between banks. Bank 1: P2B53; stuck off: P2B50.

Likely causes

Actuator B on the bank 2 intake camshaft stays engaged (sticking plunger)
Control line shorted so the solenoid remains energised
Position feedback of the actuator stuck at the engaged value

Symptoms

  • Check engine light on
  • Uneven running between the banks, especially at part load
  • Profile switching disabled by the engine control

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

a camshaft profile actuator b b2wiring harnessecm

Related codes

P2B53P2B50P2B56P2B37P003F

References: ntn-snr.com, law.cornell.edu, gsi.ext.gm.com.