Powertrain, generic (extended)

P2C05 A Camshaft Profile Actuator Position Sensor A Circuit Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Engines with switchable cam lobes use small solenoid actuators that push a pin into a groove of a sliding cam sleeve; a feedback signal confirms that the pin has moved. P2C05 is the general circuit fault for feedback A on the intake camshaft (camshaft A) of bank 1. GM uses it on the 2.7 L turbo four L3B in the Silverado and Sierra 1500 from 2019: in tables 19OBDG03D and 25OBDG03B the ECM tests the circuit while the output is energised and reports an open circuit at 200 kilohms or more between signal and ground in 4 of 5 samples, with supply above 11 V, as Type A with MIL on the first trip. Low and High are P2C07 and P2C08. GM bulletins PIT5677 and 21-NA-149 trace such codes on the L3B to engine harness chafing and blown fuses. Lift changes are locked out.

Likely causes

Engine harness chafed, sometimes with blown fuses (GM L3B bulletins)
Loose or corroded connector at the profile actuator
Open circuit inside the actuator or its feedback element

Symptoms

  • Check engine light on immediately
  • Cam lift switching and cylinder deactivation unavailable, slightly reduced power or economy
  • With harness damage, many other codes and possibly no start

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–4 h

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

Parts involved

a camshaft profile actuator pos sensor a b1wiring harnessecm

Related codes

P2C06P2C07P2C08P2C09P2B33

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.