Powertrain, generic (extended)

P2C08 A Camshaft Profile Actuator Position Sensor A Circuit High Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C08 flags a short to voltage on position sensor A, the Hall feedback of the first intake profile actuator on bank 1. GM's L3B 2.7 L four runs this check the other way round from the ground test: the output stage is switched off, and if the line still shows 0.5 ohm or less towards controller power, 4 of 5 such readings above 11 V store a Type A code with immediate MIL (19OBDG03D, again 25OBDG03B). Unlike the ground fault P2C07, P2C08 sits in the main code list of GM bulletins PIT5677 (2019) and 21-NA-149 (2019 to 2021 Silverado and Sierra 1500), which blame engine harness damage over the camshaft carrier and near the left shock tower and mention blown fuses. Lift switching stops until the fault is cleared. Open circuit: P2C05.

Likely causes

Chafed engine harness touching a live circuit (GM bulletins PIT5677, 21-NA-149)
Internal short to supply inside the actuator or its feedback element
Faulty output stage in the ECM

Symptoms

  • MIL lit immediately
  • No valve lift change and no cylinder deactivation
  • After harness damage also rough running, reduced power 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 a b1wiring harnessecm

Related codes

P2C05P2C07P2C0CP2C10P2C15

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