P03F0 code meaning
A Camshaft Profile Actuator C Control Stuck On Bank 1
Powertrain system Generic code P03xx codes Check engine light
What P03F0 means
With a sliding camshaft, the intake camshaft (camshaft A) carries movable cam pieces with several lift profiles; solenoid actuators shoot a pin into a groove in the piece and shift it axially. Actuator C is the third of these actuators – not a profile position. The only known user is GM's 2.7-litre turbo four (L3B, three-step sliding cam, from model year 2019). P03F0 means the actuator stays on: its pin remains extended although it was commanded off. GM checks whether the pin returns past its retraction threshold by the end of the engine cycle; a single failure in 5 samples sets the code (MIL on the first trip), because a pin left extended can drag in the groove and shift the piece wrongly.
P03F0 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P03F0
- Check engine light on
- Ticking or rattling at the camshaft carrier
- Misfire, rough idle or less power in the wrong lift profile
- Lift switching and cylinder deactivation out of service
Common causes of P03F0
- Most likelyPin sticking in the actuator (sludge, wear)
- PossibleReturn ramp of the shift groove damaged or cam piece sticking
- PossibleSolenoid stays energized (control wire shorted to ground)
- Less likelyHall feedback faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Camshaft profile actuator c intakeSliding camshaftActuator wiringEngine control module
What each part of P03F0 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| F0 | The exact fault in that area. |
What to do next
- Note P03F0 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 P03F0
What does P03F0 mean?
P03F0 means "A Camshaft Profile Actuator C Control Stuck On Bank 1". With a sliding camshaft, the intake camshaft (camshaft A) carries movable cam pieces with several lift profiles; solenoid actuators shoot a pin into a groove in the piece and shift it axially. It is a generic code, so it means the same on every make.
Is it safe to drive with P03F0?
Drive gently and only to a workshop. With P03F0 the car can go into limp mode (reduced power) to protect itself.
Will P03F0 fail an emissions test?
Yes, it can. P03F0 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 P03F0 to fix?
Difficulty: hard. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P03F0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.