P03F3 code meaning
B Camshaft Profile Actuator C Control Circuit High Bank 1
Powertrain system Generic code P03xx codes Check engine light
What P03F3 means
With a sliding camshaft, the exhaust camshaft (camshaft B) 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). P03F3 means the control circuit is shorted to the supply voltage: GM checks with the driver off and sets the code at 0.5 Ω or less between signal and supply (4 of 5 samples, above 11 V, MIL on the first trip). The actuator can then not shift its cam piece, and lift switching and cylinder deactivation are blocked.
P03F3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P03F3
- Check engine light on
- Lift switching and cylinder deactivation blocked, higher consumption
- Possibly rough running if a cam piece stays in the wrong position
Common causes of P03F3
- Most likelyControl wire shorted to battery voltage
- PossibleShort between supply and control pin in the connector (water, corrosion)
- PossibleInternal short in the actuator
- Less likelyDriver in the engine module
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 exhaustSliding camshaftActuator wiringEngine control module
What each part of P03F3 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. |
| F3 | The exact fault in that area. |
What to do next
- Note P03F3 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 P03F3
What does P03F3 mean?
P03F3 means "B Camshaft Profile Actuator C Control Circuit High Bank 1". With a sliding camshaft, the exhaust camshaft (camshaft B) 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 P03F3?
Drive gently and only to a workshop. With P03F3 the car can go into limp mode (reduced power) to protect itself.
Will P03F3 fail an emissions test?
Yes, it can. P03F3 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 P03F3 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P03F3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.