Engine and gearbox (P)
P001B: Camshaft Actuator Control Circuit Low
This code indicates a low control voltage at the camshaft profile actuator for bank 1. It usually means there is a short to ground in the wiring or the actuator coil.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Engine runs rough
- Reduced power
- Poor fuel economy
- Check engine light on
Common causes
- Wiring shorted to ground
- Actuator coil shorted internally
- Corroded connector pins
How to check it yourself
- Inspect wiring for damage or wear
- Check connector pins for corrosion
- Test actuator coil resistance
- Check for stored codes related to camshaft position
Can I keep driving?
The car can still be driven, but performance may be reduced.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer