Powertrain, generic (extended)

P2C15 B Camshaft Profile Actuator Position Sensor A Circuit High Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2C15 stands for a short to voltage on the exhaust position sensor A circuit, bank 1, i.e. the Hall feedback of GM's first exhaust actuator on the L3B four. This test runs with the output switched off: if a resistance of 0.5 ohm or less to controller power remains on the line, four failed reports in five at more than 11 V produce a Type A code, MIL at once (19OBDG03D, 25OBDG03B). P2C15 belongs to the main code list of PIT5677 and of 21-NA-149 for 2019 to 2021 L3B trucks. From the A revision on, these bulletins also mention blown underhood fuses alongside no-start, rough running and reduced power, so a short to power is often only one symptom of a larger harness fault. Exhaust lift changes stop. Open: P2C12, ground short: P2C14.

Likely causes

Chafed harness letting the sensor line touch a supply wire (GM PIT5677, 21-NA-149)

Short to supply inside exhaust actuator 1

Defective output stage in the ECM

Symptoms

MIL lit straight away
Exhaust cam profile stays fixed
Together with harness damage, blown fuses, no start or reduced power possible

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 a b1wiring harnessecm

Related codes

P2C12 P2C13 P2C14 P2C19 P2C08 P002C

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