Powertrain
Definition only
Lights the check engine lamp
P2DE9: Cold Start Engine Coolant Pump Underspeed
Standardized SAE J2012 code · P2Dxx codes
What does P2DE9 mean?
During cold start, the engine coolant pump runs below the calibrated minimum speed. Cold viscosity load too high or pump weak.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Cold coolant viscosity too high
- Medium Pump output degraded
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2DE9 on the same make and model first.
P2DE9 in the community
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