Powertrain, generic (extended)

P2C19 B Camshaft Profile Actuator Position Sensor B Circuit High Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2C19 closes the sensor B group on the exhaust camshaft of bank 1: the feedback circuit of GM's exhaust Hall sensor 2 is shorted to a voltage source. For the L3B the ECM checks while the output is off; a path of at most 0.5 ohm to controller power, reported four times in five with supply over 11 V, gives a Type A code with the MIL on in the first trip (19OBDG03D, 25OBDG03B). P2C19 sits in the main code list of PIT5677 and 21-NA-149, which blame L3B harness damage at the camshaft carrier cover, at the base of the air cleaner box, or near the alternator bracket and the stud of the left front spring. Since no third exhaust Hall sensor exists on this engine, P2C19 is the last exhaust feedback code GM uses. Open: P2C16, ground: P2C18.

Likely causes

Harness chafed at generator bracket or coil spring stud, line touching a live wire (GM 21-NA-149)

Exhaust actuator 2 shorted internally to supply

ECM output stage faulty

Symptoms

MIL on in the first drive
Exhaust lift switching disabled
With extensive harness damage, stalling, no crank or blown fuses

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 b b1wiring harnessecm

Related codes

P2C15 P2C16 P2C17 P2C18 P2C0C P2B3B

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