Low engine oil level or oil that is degraded, dirty or the wrong grade, so oil pressure to the actuator is poor; Faulty actuator or control solenoid (stuck, sticking or failed internally); Wiring or connector fault on the actuator circuit, such as chafing, corrosion, a poor pin fit or an open or short circuit; Blocked oil passage or screen restricting oil flow to the actuator; Mechanical wear or damage in the cam profile switching mechanism, such as followers, rockers or the camshaft itself; Faulty camshaft or crankshaft position sensor giving feedback the control unit reads as a failed profile change; Fault inside the engine control unit driver circuit.

P005A

B Camshaft Profile Actuator A Control Performance/Stuck Off Bank 1.

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
5A: FaultThe specific fault in that area

What it means

P005A means the engine control unit has found that the camshaft profile actuator on bank 1 is not responding as commanded, or is stuck in its off (default) position. The control unit compares the commanded cam profile or lift state with feedback from the cam and crank position sensors and other inputs. The actual response did not match the command, so the fault was set. Which actuator counts as 'A' or 'B' and how the system works depends on the make, model and engine, so check the manufacturer's data.

Symptoms

Engine warning light on
Loss of power or flat top-end performance
Rough running or an unsteady idle
Poor fuel economy
Ticking or tapping from the valvetrain
Engine running in a reduced-power mode

Possible causes

Low engine oil level or oil that is degraded, dirty or the wrong grade, so oil pressure to the actuator is poorlikely
Faulty actuator or control solenoid (stuck, sticking or failed internally)likely
Wiring or connector fault on the actuator circuit, such as chafing, corrosion, a poor pin fit or an open or short circuitpossible
Blocked oil passage or screen restricting oil flow to the actuatorpossible
Mechanical wear or damage in the cam profile switching mechanism, such as followers, rockers or the camshaft itselfpossible
Faulty camshaft or crankshaft position sensor giving feedback the control unit reads as a failed profile changerare
Fault inside the engine control unit driver circuitrare

How to diagnose

Read all stored and pending codes and the freeze frame data. Note engine temperature, load and rpm when the fault set, and look for related cam timing or oil pressure codes.
Check the engine oil level and condition, and confirm the oil meets the manufacturer's specification. Look for signs of sludge or overdue servicing.
Inspect the actuator, its wiring and the connector for damage, oil contamination, corrosion, chafing and a secure fit.
Test the actuator circuit for power, ground and signal, and measure the solenoid resistance against the manufacturer's specification.
With a scan tool that supports bidirectional control, command the actuator on and off. Compare the commanded and actual cam profile or position values, and listen and watch for a response.
Check the camshaft and crankshaft position sensor signals and their wiring for faults that could upset the feedback.
Check oil pressure with a gauge if the oil level and electrical checks are fine. Then inspect the actuator oil feed passages and screen for blockage.
If everything else passes, inspect the valvetrain and switching mechanism for wear or damage, following the model-specific procedure.

How to fix

Correct the oil level, and change the oil and filter to the correct specification if it is dirty, degraded or the wrong type.
Repair or replace damaged wiring, terminals or connectors on the actuator circuit.
Replace the actuator or control solenoid if it is stuck or fails electrical or functional tests.
Clean or clear blocked oil passages or screens, and fix the cause of any contamination.
Repair or replace worn or damaged valvetrain parts in the profile switching mechanism, as the manufacturer's procedure specifies.
Replace a faulty camshaft or crankshaft position sensor if it is shown to be the cause.

Can I keep driving?

Medium severity

The car can usually be driven gently for a short time, but expect reduced power and possible limp mode. Book it in soon, because low oil pressure or a worn mechanism could cause engine damage if ignored. Stop and check the oil level straight away if the oil pressure warning light comes on.

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