Piston Cooling Oil Control Circuit Stuck On
The piston cooling solenoid does not close when commanded off — jets remain active when not needed. Oil pressure to top-end consumers may sag, and warm-up takes longer because the cooling jets remove heat from the pistons during cold start.
Affected components
- Piston cooling solenoid
Common causes
- High likelihood: Solenoid stuck open
- Low likelihood: Carbon or debris buildup preventing free movement
- Low likelihood: Component wear with age - mechanical play
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.