P03EC code meaning
A Camshaft Profile Actuator C Control Circuit/Open Bank 1
Powertrain system Generic code P03xx codes Check engine light
What P03EC 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). P03EC means the actuator's control circuit is open: GM checks the circuit with the driver on and sets the code at an impedance of 200 kΩ or more (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.
P03EC 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 P03EC
- 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 P03EC
- Most likelyActuator connector loose, corroded or pin pushed back (often after valve cover work)
- PossibleActuator solenoid open
- PossibleWire broken in the engine harness
- 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 intakeSliding camshaftActuator wiringEngine control module
What each part of P03EC 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. |
| EC | The exact fault in that area. |
What to do next
- Note P03EC 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 P03EC
What does P03EC mean?
P03EC means "A Camshaft Profile Actuator C Control Circuit/Open 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 P03EC?
Drive gently and only to a workshop. With P03EC the car can go into limp mode (reduced power) to protect itself.
Will P03EC fail an emissions test?
Yes, it can. P03EC 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 P03EC to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P03EC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.