Cylinder 1 Deactivation Performance/Stuck Off
The engine control module has detected that cylinder 1 remains deactivated when activation is commanded — the cylinder does not contribute to combustion when expected.
Affected components
- Cylinder deactivation solenoid
- Lifter
- Oil control valve
Common causes
- High likelihood: Lifter stuck collapsed
- Medium likelihood: Solenoid stuck
- Low likelihood: Carbon or debris buildup preventing free movement
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
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.