Powertrain, generic (extended)

P2B3D B Camshaft Profile Actuator B Control Circuit Low Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2B3D: the control wire of the second exhaust-side profile actuator on bank 2 (camshaft B, actuator B) has contact with ground. Publicly documented use by a manufacturer is not known. For comparison, GM's L3B diagnostics define the bank 1 code P2B3A as a ground short of at most 0.5 Ω with the driver on and four failed tests out of five. Because 13 CCR 1968.2 requires engine control outputs to be monitored for such faults, a V engine with exhaust lobe switching on both banks would need this code. Look for chafing at brackets and valve cover edges or for a shorted coil. The exhaust valves on bank 2 then keep their current lift profile, and any function that relies on switching there is unavailable.

Likely causes

Wire chafed at a bracket or valve cover edge on bank 2
Shorted coil in exhaust actuator B
Oil or water in the connector

Symptoms

  • Check engine light on
  • Bank 2 exhaust stays on one lift profile

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
Time1–4 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

P2B3CP2B3EP2B3AP2B37P002E

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