Powertrain
Definition only
Lights the check engine lamp
P2B9D: Coolant Pump A Supply Voltage Circuit
Standardized SAE J2012 code · P2Bxx codes
What does P2B9D mean?
Coolant pump A reports a supply voltage circuit condition. Coolant circulation through the affected loop cannot be commanded reliably.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Supply fuse blown
- Medium Wiring or connector fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2B9D on the same make and model first.
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