Cylinder Deactivation Hydraulic Circuit Bank 1 Low
The engine control module has detected low oil pressure in the bank 1 hydraulic circuit responsible for cylinder deactivation. Below threshold pressure the lifters cannot collapse and the system disables further deactivation requests on bank 1.
Affected components
- Oil pump
- Oil control valve
- Oil pressure switch
Common causes
- High likelihood: Low engine oil level
- Medium likelihood: Oil pump worn or weak
- Medium likelihood: Oil pressure switch reads low
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.