P2C0B code meaning
A Camshaft Profile Actuator Position Sensor B Circuit Low Bank 1
Powertrain system Generic code P2Cxx codes Check engine light
What P2C0B means
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.
P2C0B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2C0B
- Check engine light on straight away
- Valve lift no longer changes, fuel use may rise
Common causes of P2C0B
- Most likelyInsulation of the sensor B line worn through against engine metal
- PossibleShorted actuator 2 or its integrated Hall element
- Less likelyMoisture or oil in the connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
A camshaft profile actuator pos sensor b b1Wiring harnessECM
What each part of P2C0B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| 0B | The exact fault in that area. |
What to do next
- Note P2C0B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2C0B
What does P2C0B mean?
P2C0B means "A Camshaft Profile Actuator Position Sensor B Circuit Low Bank 1". P2C0B reports that the circuit of position sensor B, the Hall feedback of the second intake actuator on bank 1, is shorted to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C0B?
Drive gently and only to a workshop. With P2C0B the car can go into limp mode (reduced power) to protect itself.
Will P2C0B fail an emissions test?
Yes, it can. P2C0B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2C0B to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2C0B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.