Powertrain
Definition only
Lights the check engine lamp
P2B63: Coolant Pump B Stuck/Stalled
Standardized SAE J2012 code · P2Bxx codes
What does P2B63 mean?
Coolant pump B reports a stuck/stalled 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 Pump impeller jammed by debris
- Medium Motor seized
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2B63 on the same make and model first.
P2B63 in the community
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