Low, degraded or wrong-grade engine oil, or a very overdue oil change, affecting hydraulic actuator operation; Faulty or sticking camshaft profile actuator or control solenoid on bank 2; Blocked oil passages or a clogged solenoid screen restricting oil flow to the actuator; Wiring damage, corrosion or poor connector contact in the actuator circuit; Faulty camshaft position sensor or a timing correlation issue giving false feedback; Mechanical wear or damage in the cam profile switching mechanism or valve gear; Engine control unit fault or outdated software, where a known issue is documented for the engine.

P003F

A Camshaft Profile Actuator A Control Stuck On Bank 2.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
3F: FaultThe specific fault in that area

What it means

P003F means the engine control unit has detected that the camshaft profile actuator 'A' on bank 2 is stuck in the on (activated) position. The control unit commands the actuator between profiles, such as low and high lift or valve deactivation, and the feedback does not match the command. The exact design and how the fault is detected vary by engine, so check model-specific information.

Symptoms

Engine warning light on
Reduced power or flat spot at higher revs
Rough idle or uneven running
Poor fuel economy
Engine may run in a limp-home mode
Unusual ticking or mechanical noise from the valve gear

Possible causes

Low, degraded or wrong-grade engine oil, or a very overdue oil change, affecting hydraulic actuator operationlikely
Faulty or sticking camshaft profile actuator or control solenoid on bank 2likely
Blocked oil passages or a clogged solenoid screen restricting oil flow to the actuatorpossible
Wiring damage, corrosion or poor connector contact in the actuator circuitpossible
Faulty camshaft position sensor or a timing correlation issue giving false feedbackpossible
Mechanical wear or damage in the cam profile switching mechanism or valve gearrare
Engine control unit fault or outdated software, where a known issue is documented for the enginerare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature, load and speed when the fault set, and check for related cam timing or oil pressure codes
Check the engine oil level, condition and grade against the manufacturer's specification, and check the service history
Inspect the bank 2 actuator or solenoid wiring and connectors for chafing, oil contamination, corrosion and bent or loose pins
Check for technical service bulletins or software updates relating to this code for the specific engine
Use a scan tool to command the actuator on and off and watch the live camshaft position and desired versus actual values for bank 2
Test the actuator or solenoid resistance and supply and control circuits against specification
Inspect the solenoid screen and oil feed for debris and check oil pressure with a mechanical gauge if indicated
Check the camshaft position sensor signal and cam timing correlation, then inspect the valve gear if the electrical checks pass

How to fix

Change the oil and filter using the correct specification if it is low, dirty or the wrong grade, then clear the code and retest
Repair or replace damaged wiring or connectors in the actuator circuit
Replace the faulty bank 2 camshaft profile actuator or control solenoid, and clean or replace its oil screen
Clear blocked oil passages and repair any cause of contamination or low oil pressure
Replace a faulty camshaft position sensor if its signal is incorrect
Repair worn or damaged cam profile mechanism components, or apply an updated calibration if one is a documented fix for the engine

Can I keep driving?

Medium severity

Short, gentle journeys are usually possible, but get it diagnosed soon as the engine may run in a reduced-power mode and a mechanical or oil supply fault could get worse. Stop driving if you see an oil pressure warning, hear loud mechanical noises or the engine runs very roughly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.