Code result
P2DE9
Cold Start Engine Coolant Pump Underspeed
High severity
What it means
During cold start, the engine coolant pump runs below the calibrated minimum speed. Cold viscosity load too high or pump weak.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Cold coolant viscosity too high
highOne of the most commonly reported causes for this code — check this first.
Pump output degraded
mediumA plausible cause — test and verify before replacing parts.
Related help
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