Powertrain, generic (extended)

P2C07 A Camshaft Profile Actuator Position Sensor A Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

On GM's 2.7 L turbo four L3B (Silverado and Sierra 1500 from 2019) each of the four intake sliding-cam actuators reports its pin travel through a Hall element; GM calls the first one intake Hall sensor 1, which is position sensor A in J2012 terms. P2C07 means this circuit is pulled to ground. The ECM checks it with the output stage switched on and treats an impedance of 0.5 ohm or less between signal and ground as a short; 4 failures in 5 samples with more than 11 V supply set a Type A code, MIL in the first trip (19OBDG03D, 25OBDG03B). GM bulletin 21-NA-149 names P2C07 only in its keyword list for chafed L3B engine harnesses. Pin feedback is lost, so lift switching and cylinder deactivation are blocked. Open circuit is P2C05, short to power P2C08.

Likely causes

Engine harness chafed through to ground, e.g. over the camshaft carrier cover
Internal short to ground in the profile actuator or its Hall element
Oil or water in the actuator connector bridging to ground

Symptoms

  • Check engine light on from the first drive
  • Engine stays on one lift profile, no cylinder deactivation, slightly higher consumption
  • With harness damage, possibly blown fuses and many further codes

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

P2C05P2C06P2C08P2C0BP2C14

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