Code result
P2B86
Coolant Pump A Overspeed/Air in System
High severity
What it means
The coolant pump A runs above the calibrated maximum speed without producing the expected flow. Indicates air pocket in the coolant loop.
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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