P03F4
B Camshaft Profile Actuator C Control Performance/Stuck Off
Cam profile actuator B position C is electrically OK but does not engage when commanded. The cam phaser actuator adjusts intake/exhaust timing under load — a stuck or slow phaser kills mid-rpm torque and can throw correlation codes between cam and crank.
Cam profile actuator B position C is electrically OK but does not engage when commanded. The cam phaser actuator adjusts intake/exhaust timing under load — a stuck or slow phaser kills mid-rpm torque and can throw correlation codes between cam and crank.
Common causes
- high
Lock pin or oil supply restricted
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-2200
- low
Carbon or debris buildup preventing free movement
Less common, but worth ruling out after the more likely causes.
Typical part cost: $220-2200
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P03F4 mean?
P03F4 means "B Camshaft Profile Actuator C Control Performance/Stuck Off (Bank 1)". It is a generic OBD-II code that points to a fault in the ignition system or misfire.
What are the most common causes of P03F4?
lock pin or oil supply restricted; carbon or debris buildup preventing free movement; component wear with age - mechanical play — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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