P2C19 code meaning
B Camshaft Profile Actuator Position Sensor B Circuit High Bank 1
Powertrain system Generic code P2Cxx codes Check engine light
What P2C19 means
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.
P2C19 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 P2C19
- MIL on in the first drive
- Exhaust lift switching disabled
- With extensive harness damage, stalling, no crank or blown fuses
Common causes of P2C19
- Most likelyHarness chafed at generator bracket or coil spring stud, line touching a live wire (GM 21-NA-149)
- PossibleExhaust actuator 2 shorted internally to supply
- Less likelyECM output stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
B camshaft profile actuator pos sensor b b1Wiring harnessECM
What each part of P2C19 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. |
| 19 | The exact fault in that area. |
What to do next
- Note P2C19 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 P2C19
What does P2C19 mean?
P2C19 means "B Camshaft Profile Actuator Position Sensor B Circuit High Bank 1". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C19?
Drive gently and only to a workshop. With P2C19 the car can go into limp mode (reduced power) to protect itself.
Will P2C19 fail an emissions test?
Yes, it can. P2C19 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 P2C19 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2C19 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.