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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Oil control valve clogged with sludgeCommon
- Low oil pressure or wrong oil viscosityPossible
- Camshaft phaser wornPossible
Parts involved
- Exhaust Camshaft Oil Control Valve
- Camshaft Phaser
- Engine Oil
- Timing Chain
P0027 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.