Powertrain, generic (extended)

P2C13 B Camshaft Profile Actuator Position Sensor A Range/Performance Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C13 is the rationality test for the first exhaust profile actuator's feedback on bank 1, so the wiring is not in question. GM's L3B tracks every exhaust shift through exhaust Hall sensor 1: the reading must drop below 55 as the pin starts to fire, below 45 when it is fully out and climb above 68 once the pin is home again. If a commanded shift does not produce these states, or the sensor reports a pin event that was never requested, four bad readings out of five with the engine running and supply over 11 V result in a Type A fault (19OBDG03D, 25OBDG03B). The test is suppressed while crank or cam position faults are active. GM names P2C13 only in the keyword index of its L3B harness bulletins. Prime suspects are a sluggish pin, sludge or a worn exhaust sleeve groove.

Likely causes

Pin of exhaust actuator 1 slow or sticking (sludge, overdue oil change, wrong oil grade)
Worn shift groove or weak detent on the exhaust cam sleeve
Hall element in actuator 1 delivering drifting levels

Symptoms

  • Warning lamp on at once
  • Exhaust lift locked on one profile, cylinder deactivation inactive
  • Occasional clicking from the top of the engine

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 a b1wiring harnessecm

Related codes

P2C12P2C14P2C15P2C17P2C06P005A

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