Powertrain, generic (extended)

P2C1B B Camshaft Profile Actuator Position Sensor C Range/Performance Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Range/Performance for exhaust position sensor C, bank 1: the signal is electrically fine but does not match the commanded pin movement of a third exhaust profile actuator. There is no public manufacturer documentation for P2C1B. The comparable test on GM's L3B (P2C13, P2C17) watches three Hall states per shift and also catches pin activity without a command; GM's engine has no third exhaust feedback, so the code stays unused there. CARB explicitly expects valve lift diagnostics to detect a single pin that does not reach its intended position, which is what such a code would cover. Mechanical causes such as a sticking pin, heavy oil sludge or a damaged sleeve groove would be more likely than wiring. Driving effect: lamp on, exhaust profile frozen.

Likely causes

Actuator pin sticking or reacting too slowly
Sludge or wrong oil viscosity in the valve train
Position sensor reporting implausible levels

Symptoms

  • Warning lamp on
  • Exhaust lift held on one profile, possibly ticking from the head

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time0.5–6 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

P2C1AP2C1CP2C1DP2C17P2C0EP03F4

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