What it means
B Camshaft Position Actuator Position Sensor C Circuit High (Bank 1): the signal 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 position actuator position sensor C sends its position signal to the engine control module. This code sets when the signal voltage is above its expected range; an open signal line or contact with battery positive can cause that high reading.
Common causes
Most likely first.
- Open signal line
- 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 review live data for the Bank 1 sensor C position signal when the high-signal fault occurs.
- Inspect the sensor C connector and Bank 1 harness for broken wires, backed-out pins, or insulation damaged where it could touch a B+ source.
- Check the connector terminals for corrosion or poor contact that could interrupt the signal path.
- Use the wiring diagram and manufacturer’s procedure to test the signal wire for an open circuit or short to B+.
- If wiring and terminals pass, test the sensor supply, ground, and output to the manufacturer’s specification.
Common fixes
- Repair an open or broken Bank 1 sensor C signal wire.
- Separate and repair wiring that is shorted to B+.
- Clean or repair corroded or loose connector terminals.
- Replace sensor C only if circuit testing confirms it is producing an out-of-range high signal.
Can I keep driving?
Drive only as needed and avoid hard acceleration because unreliable actuator position feedback can reduce power or cause stalling. Stop if the engine stalls or runs very roughly.
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.