Powertrain, generic (extended)

P2C0C A Camshaft Profile Actuator Position Sensor B Circuit High Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

A short from the sensor B line to a voltage source triggers P2C0C. The sensor is the Hall feedback built into the second intake profile actuator on bank 1. For the L3B four in 2019 and later Silverado and Sierra 1500 trucks, GM tests with the output stage off; a reading of no more than 0.5 ohm against controller power, found four times in five checks while the supply exceeds 11 V and the key is in crank or run, gives a Type A code with MIL in the first trip (19OBDG03D, 25OBDG03B). Bulletins PIT5677 and 21-NA-149 include P2C0C in their main list for harness chafing at the camshaft carrier, the air cleaner housing and the left shock tower, where blown fuses can accompany the codes. An actuator whose position cannot be read is excluded from shifting. Ground short: P2C0B, open: P2C09.

Likely causes

Chafed harness bringing the line against a powered wire (GM PIT5677, 21-NA-149)
Internal short to supply in actuator 2
ECM output stage defective

Symptoms

  • MIL on in the first trip
  • Cam profile switching and cylinder deactivation unavailable
  • With harness damage, further codes, rough running or 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 b b1wiring harnessecm

Related codes

P2C08P2C09P2C0BP2C10P2C19

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