Code result
P2B65
Coolant Pump B Overspeed/Air in System
High severity
What it means
Coolant pump B reports a overspeed/air in system condition. Coolant circulation through the affected loop cannot be commanded reliably.
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
Air pocket in coolant loop
highOne of the most commonly reported causes for this code — check this first.
Coolant level low
mediumA plausible cause — test and verify before replacing parts.
Related help
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