Cylinder 9 Deactivation
The engine control module has detected a fault in the cylinder 9 deactivation system. Found on V10/V12 engines with cylinder deactivation — cylinder 9 cannot reliably switch state.
Affected components
- Cylinder deactivation solenoid
- Lifter
- Engine wiring harness
Common causes
- High likelihood: Deactivation solenoid failed
- Medium likelihood: Lifter stuck
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
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.