What does code P2DE9 mean?

Q: What does code P2DE9 mean?

Cold Start Engine Coolant Pump Underspeed. P2DE9 indicates that the engine control module has detected the cold start engine coolant pump running slower than the commanded speed during a cold start event. The pump is typically an auxiliary electric pump used to circulate coolant through the heater core and engine block to speed warm-up and improve emissions; the module compares actual pump speed (via a feedback signal) to the expected speed and sets the code when the actual speed falls below a calibrated threshold.

DTC codes / P2Dxx · Hybrid propulsion / P2DE9

P2DE9Cold Start Engine Coolant Pump Underspeed

P2DE9 indicates that the engine control module has detected the cold start engine coolant pump running slower than the commanded speed during a cold start event. The pump is typically an auxiliary electric pump used to circulate coolant through the heater core and engine block to speed warm-up and improve emissions; the module compares actual pump speed (via a feedback signal) to the expected speed and sets the code when the actual speed falls below a calibrated threshold.

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.