P0B3A

Motor Electronics Coolant Pump B Control Circuit High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Engine overheating
Unstable cooling fan operation
Reduced engine power
Possible overheating messages on the instrument panel

Causes

Cooling pump malfunction
Open or short circuit in control circuit
Pump relay or fuse problems
Engine control unit (ECU) malfunction
Oxidation of contacts in pump connectors

How to Fix

Check fuses and pump relays
Diagnose resistance and voltage in the control circuit
Inspect connectors and wiring harness for damage
Check the functionality of the cooling pump itself
If necessary, replace the pump or repair the wiring

Related codes

P0B39 P0B3B P0B3C