What it means
Cam profile actuator B position C is stuck engaged when commanded off — typically a stuck oil control valve.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The Bank 1 B camshaft profile actuator C changes the cam profile when commanded by the engine control module. The module checks that the mechanism disengages when commanded off; this code sets when the actuator remains engaged, often because its oil control valve sticks or the mechanism cannot return.
Common causes
Most likely first.
- Oil control valve stuck open
- Carbon or debris buildup preventing free movement
- Component wear with age - mechanical play
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
How to diagnose it
- Record freeze-frame data and compare the Bank 1 actuator C command with its reported state and cam timing in live data.
- Check engine oil level and condition, since contaminated or unsuitable oil can contribute to a sticking oil control valve.
- Inspect the Bank 1 actuator C connector and wiring for damage or poor contact that could leave the actuator commanded on.
- Use the manufacturer’s procedure to verify that the module command switches off and that the actuator control responds.
- If the electrical command is correct, inspect the oil control valve and profile mechanism for debris, sticking, or wear.
Common fixes
- Correct low or degraded engine oil and service it as specified for the vehicle.
- Repair damaged wiring or poor connections at the Bank 1 actuator C.
- Clean or replace a sticking oil control valve if inspection confirms it is the cause.
- Repair or replace a worn or sticking profile mechanism after confirming the fault.
Can I keep driving?
Avoid hard acceleration and long trips if the engine runs, because the cam profile may remain engaged and cause poor power, rough idle, or stalling. Stop driving if it stalls or runs severely rough.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.