Powertrain, generic (extended)

P2C14 B Camshaft Profile Actuator Position Sensor A Circuit Low Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

With P2C14 the ECM reports that the line of exhaust position sensor A on bank 1 is grounded. GM applies the check on the L3B 2.7 L while the driver is commanded on: a signal-to-ground impedance of 0.5 ohm or below, seen in four of five samples with the key in crank or run and more than 11 V, sets Type A with immediate MIL; the 2025 table 25OBDG03B adds a general enable flag but keeps the limit (19OBDG03D). Unlike P2C12 and P2C15, P2C14 does not appear in the main code list of PIT5677 or 21-NA-149, only among their search keywords. Typical causes are insulation worn through on the cylinder head or the generator bracket, or a shorted actuator. The exhaust sleeves of bank 1 stay where they are; the driver mostly notices the warning lamp.

Likely causes

Signal wire of exhaust sensor A rubbed bare against the head or a bracket

Internal short to ground in exhaust actuator 1

Engine oil wicked into the actuator plug

Symptoms

MIL on immediately
No exhaust lift change, slightly higher consumption under light load

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 P2C15 P2C18 P2C07 P002B

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