Powertrain, generic (extended)

P2C0B A Camshaft Profile Actuator Position Sensor B Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C0B reports that the circuit of position sensor B, the Hall feedback of the second intake actuator on bank 1, is shorted to ground. GM's L3B 2.7 L uses it with a resistance test while the output is on: at 0.5 ohm or less from signal to ground, 4 of 5 failed samples with supply over 11 V store a Type A code and the MIL comes on immediately (19OBDG03D, 25OBDG03B). Interestingly, GM's table wording for this test speaks of the sensor's solenoid driver, so the ECM judges the line from its output stage rather than from a sensor voltage. GM lists P2C0B only among the keywords of bulletins PIT5677 and 21-NA-149 on L3B harness chafing. Possible effects: stuck lift profile, no cylinder deactivation. Open: P2C09, short to power: P2C0C.

Likely causes

Insulation of the sensor B line worn through against engine metal
Shorted actuator 2 or its integrated Hall element
Moisture or oil in the connector

Symptoms

  • Check engine light on straight away
  • Valve lift no longer changes, fuel use may rise

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

a camshaft profile actuator pos sensor b b1wiring harnessecm

Related codes

P2C07P2C09P2C0AP2C0CP2C0FP2C18

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