Cold Start Engine Coolant Bypass Valve D Stuck Open
During cold start, the engine coolant bypass valve D is stuck in the open position. Coolant bypasses the warm-up loop.
Affected components
- Engine coolant bypass valve d
Common causes
- High likelihood: Valve stuck in open position
- Medium likelihood: Actuator failed
- 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.