Powertrain, generic (extended)

P2B37 A Camshaft Profile Actuator B Control Circuit Low Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Code P2B37 stands for a control line shorted to ground at intake-side actuator B of bank 2, the second lobe-switching solenoid on camshaft A of the other cylinder bank. Publicly, no maker assigns it to a vehicle. The bank 1 analogue P2B34 is defined by GM for the L3B four-cylinder, which flags a ground short at 0.5 Ω or less while the output is on; a V engine would need a mirror-image test for its second bank. The regulation (13 CCR 1968.2, comprehensive components) demands detection of such short circuits on output components. Typical causes are a harness rubbed through on the cylinder head or water and oil in the connector. With a grounded control line the actuator cannot work reliably, and lift switching on bank 2 is lost.

Likely causes

Harness to the bank 2 actuator chafed through on the cylinder head or a bracket
Oil or water in the actuator connector
Shorted winding in actuator B

Symptoms

  • Check engine light on
  • Lift switching inactive on bank 2, less power or more fuel use

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

a camshaft profile actuator b b2wiring harnessecm

Related codes

P2B36P2B38P2B34P2B3DP001E

References: law.cornell.edu, gsi.ext.gm.com, audi-technology-portal.de.