Engine Oil Bypass Valve Control Circuit Open
The oil bypass valve - which routes oil around the cooler to speed up warm-up - has an open control circuit. Without it, oil temperature rise during cold-start is slower than calibrated.
Affected components
- Oil bypass valve
Common causes
- High likelihood: Open in valve or harness
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.