P2B85

Engine Coolant Pump Underspeed

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Engine overheating
High temperature warning on dashboard
Reduced engine power
Unstable engine operation
Turning the cooling fan on at high speed

Causes

Electrical coolant pump malfunction
Problems with pump wiring or connectors
Faulty pump relay or fuse
Problems with the engine control unit
Mechanical jamming of the pump

How to Fix

Check coolant pump fuses and relays
Check the integrity of the wiring and connectors of the pump
Check the functionality of the coolant pump
Check control signals from the engine control unit
Replace the coolant pump if necessary

Related codes

P2B84 P2B86 P2610