What does code P2DE8 mean?

Q: What does code P2DE8 mean?

Cold Start Engine Coolant Bypass Valve D Stuck Open. P2DE8 indicates that the powertrain control module has detected a fault in the cold start engine coolant bypass valve circuit, specifically that valve D is stuck open. The computer monitors the valve's commanded position versus actual coolant temperature response during a cold start, and when the temperature rises faster than expected or the valve's feedback signal does not match the command, it sets this code.

DTC codes / P2Dxx · Hybrid propulsion / P2DE8

P2DE8Cold Start Engine Coolant Bypass Valve D Stuck Open

P2DE8 indicates that the powertrain control module has detected a fault in the cold start engine coolant bypass valve circuit, specifically that valve D is stuck open. The computer monitors the valve's commanded position versus actual coolant temperature response during a cold start, and when the temperature rises faster than expected or the valve's feedback signal does not match the command, it sets this code.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.