P0027 — Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1
The ECU detects that the exhaust camshaft oil control valve on bank 1 does not respond to commanded duty cycle within expected limits. Camshaft phase deviates from target during phaser actuation tests.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Exhaust camshaft oil control valve
- Camshaft phaser
- Engine oil
- Timing chain
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Oil control valve clogged with sludge
- Low oil pressure or wrong oil viscosity
- Camshaft phaser worn
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.