Powertrain, generic (extended)

P2B35 A Camshaft Profile Actuator B Control Circuit High Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2B35 is the short-to-voltage counterpart for intake-side actuator B on bank 1, the second of the sleeve-shifting solenoids on camshaft A. In GM's L3B tables (2019 and again 2025) this test runs while the output is off: if the control line shows 0.5 Ω or less towards the controller supply, a short to power is assumed, and 4 hits in 5 samples set a Type A code with the warning lamp on in the same drive. A wire rubbing against a powered circuit in the harness or an internal short in the solenoid are typical reasons. Because the control line no longer behaves as commanded, the cam sleeve cannot be moved reliably and this actuator drops out of lift switching. Open and ground faults are covered by P2B33 and P2B34.

Likely causes

Control wire chafed against a powered circuit in the engine harness
Internal short in actuator B
Output stage in the engine control module faulty

Symptoms

  • MIL on during the drive in which the fault appears
  • Intake lift profile no longer changes as commanded
  • Higher fuel use because cylinder deactivation is blocked

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time1–4 h

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

Parts involved

a camshaft profile actuator b b1wiring harnessecm

Related codes

P2B33P2B34P2B38P2B3BP001C

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, law.cornell.edu.