P0027 Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1

P0027 points to an exhaust valve control solenoid circuit range or performance problem on bank 1. The commanded exhaust valve control response is outside the expected window.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not treat this as a simple sensor code; oil-flow, solenoid, circuit, and mechanical response all matter.

Symptoms of P0027

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0027

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Inspect the exhaust valve control solenoid connector, wiring, control circuit, oil supply, and oil contamination.
Compare commanded operation with actual cam or lift response and look for slow, stuck, or inconsistent movement.
Review related cam timing, oil pressure, or actuator codes that can explain why the solenoid response is abnormal.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.