Cold Start Engine Coolant Bypass Valve D Stuck Closed
During cold start, engine coolant bypass valve D is stuck closed. Coolant cannot flow through the affected branch.
Affected components
- Engine coolant bypass valve d
Common causes
- High likelihood: Valve stuck closed at cold
- Medium likelihood: Actuator response sluggish at cold
- Low likelihood: Carbon or debris buildup preventing free movement
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.