Engine and gearbox (P)
P0027: Exhaust Valve Control Solenoid Issue
The engine control unit (ECU) has detected a problem with the exhaust camshaft oil control valve on bank 1. It is not responding as expected to the commands given by the ECU.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Engine runs rough
- Decreased fuel efficiency
- Check engine light on
- Reduced power
Common causes
- Oil control valve clogged with sludge
- Low oil pressure or wrong oil viscosity
- Camshaft phaser worn
How to check it yourself
- Check engine oil level and condition
- Inspect oil control valve for sludge
- Verify oil pressure is within specifications
- Examine camshaft phaser for wear
Can I keep driving?
The car can be driven, but it is advisable to address the issue soon to avoid further engine problems.
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