Powertrain
generic / SAE
P2DE8
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberD / E8
Possible causes
- Valve stuck in open position high
- Actuator failed medium
- Carbon or debris buildup preventing free movement low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–800 €
- Estimated time: 1–4 h
- Component: engine coolant bypass valve d
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012