Powertrain, generic (extended)

P2C1C B Camshaft Profile Actuator Position Sensor C Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C1C is reserved for a circuit-low fault, typically a short to ground, in the feedback of exhaust position sensor C on bank 1. It is not used in any public manufacturer documentation. GM's L3B tables show how its siblings work: P2C14 and P2C18 compare the line against ground with the driver on and declare a short at 0.5 ohm or less in four of five samples. Because that engine carries only two exhaust Hall sensors, the C position is not populated. CARB's comprehensive component rules would require a manufacturer that fits a third exhaust actuator to detect such out-of-range input. If it ever appears, check for chafed insulation and moisture at the actuator plug before replacing parts.

Likely causes

Sensor C wire chafed through to ground
Shorted actuator or position sensor
Moisture in the actuator connector

Symptoms

  • MIL on
  • No change of exhaust cam profile

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

b camshaft profile actuator pos sensor c b1wiring harnessecm

Related codes

P2C1AP2C1BP2C1DP2C18P2C0FP03F2

References: law.cornell.edu, gsi.ext.gm.com, gm-techlink.com.