What it means
B Camshaft Profile Actuator C Control Circuit High (Bank 1): the control-circuit voltage is above the expected range. This relates to engine timing; a fault can cause rough running, a no-start, or timing errors.
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 control circuit operates a mechanism that changes the cam profile. The engine control module monitors circuit voltage during control; this code sets when voltage is higher than expected, which can happen if the control wire contacts battery positive.
Common causes
Most likely first.
- Short to B+
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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 check live data for the Bank 1 actuator C command and cam timing when the high-circuit fault appears.
- With the ignition off, inspect the actuator C connector and Bank 1 harness for pinched wiring, damaged insulation, or contact with a battery-positive feed.
- Check connector terminals for corrosion, looseness, or signs of heat that could interrupt the control signal.
- Use the wiring diagram and manufacturer’s procedure to test the actuator C control wire for a short to B+ and verify continuity.
- If the harness and connector pass, test the actuator and module circuit to the manufacturer’s specification before replacing components.
Common fixes
- Separate and repair a control wire pinched against a B+ source.
- Repair damaged Bank 1 actuator C wiring that is shorted to power.
- Clean or repair corroded or loose connector terminals.
- Replace the actuator or repair the module circuit only if testing confirms the fault there.
Can I keep driving?
Limit driving to a short trip if the engine runs smoothly, and avoid hard acceleration because cam-profile control may be impaired and power may drop. Stop if the engine stalls or becomes very 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.