P2C09 code meaning
A Camshaft Profile Actuator Position Sensor B Circuit Bank 1
Powertrain system Generic code P2Cxx codes Check engine light
What P2C09 means
Position sensor B belongs to the second of the four intake actuators that slide the cam sleeves on GM's L3B; GM's tables call it intake Hall sensor 2. The sensors are thus one per actuator, not one per lift step: sensors A to C get J2012 codes, while GM puts the fourth (sensor D) under its own codes P30B0 to P30B3. P2C09 is the open-circuit test for sensor B. With the output energised the ECM expects a low impedance; 200 kilohms or more between signal and ground in 4 of 5 samples, supply above 11 V, set a Type A fault (19OBDG03D, 25OBDG03B). GM bulletins PIT5677 and 21-NA-149 list P2C09 for L3B trucks with chafed harnesses. Without feedback the ECM cannot confirm shifts, so lift switching is disabled. Low and High are P2C0B and P2C0C.
P2C09 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 P2C09
- Check engine light on in the first trip
- Lift switching and cylinder deactivation locked out
- Usually no noticeable change in driving apart from fuel use
Common causes of P2C09
- Most likelyLoose, unplugged or corroded connector on actuator 2
- PossibleWire broken by harness chafing on the camshaft carrier (GM L3B bulletins)
- PossibleOpen circuit inside the actuator or its Hall element
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 P2C09 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. |
| 09 | The exact fault in that area. |
What to do next
- Note P2C09 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 P2C09
What does P2C09 mean?
P2C09 means "A Camshaft Profile Actuator Position Sensor B Circuit Bank 1". Position sensor B belongs to the second of the four intake actuators that slide the cam sleeves on GM's L3B; GM's tables call it intake Hall sensor 2. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C09?
Drive gently and only to a workshop. With P2C09 the car can go into limp mode (reduced power) to protect itself.
Will P2C09 fail an emissions test?
Yes, it can. P2C09 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 P2C09 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2C09 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.