Cylinder Deactivation Hydraulic Circuit Bank 1 Performance
The engine control module has detected a performance fault in the bank 1 hydraulic circuit used for cylinder deactivation. Oil pressure response or timing is outside the expected window during deactivation events, often caused by viscosity issues, internal leaks or worn lifters.
Affected components
- Oil control valve
- Lifter
- Engine oil
Common causes
- High likelihood: Incorrect oil viscosity or aged oil
- Medium likelihood: Switching lifter worn or sticking
- Medium likelihood: Internal oil leak in deactivation circuit
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.