P2B85
Engine Coolant Pump Underspeed
P2B85 is an OBD-II diagnostic trouble code meaning: Engine Coolant Pump Underspeed. Common causes: electrical coolant pump malfunction, problems with pump wiring or connectors. Estimated repair cost: $56–167.
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
Error P2B85 by Vehicle Brand
FAQ
What does the P2B85 code mean?
P2B85 is an OBD-II diagnostic trouble code that indicates: Engine Coolant Pump Underspeed
What causes a P2B85 error code?
The most common causes of P2B85 include: Electrical coolant pump malfunction; Problems with pump wiring or connectors; Faulty pump relay or fuse; Problems with the engine control unit.
How do I fix a P2B85 diagnostic trouble code?
To fix P2B85: Check coolant pump fuses and relays. Check the integrity of the wiring and connectors of the pump. Check the functionality of the coolant pump. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2B85?
Do not drive — repair immediately
How much does it cost to fix P2B85?
The estimated repair cost for P2B85 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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