P2B66

Coolant Pump D Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–133 (est.)

Symptoms

Check Engine Light Is On
Engine overheating
Long warm-up of the interior in winter
Unstable operation of the cooling system
Reduced efficiency of the climate system

Causes

Open or short circuit in the pump control circuit
Pump relay fault
Poor contact in connectors
Coolant pump failure
Problems with the engine control unit

How to Fix

Check the pump fuse and relay
Inspect the wiring harness for damage
Check connections and connector contacts
Test the operation of the coolant pump
Replace the pump if necessary

Related codes

P2B65 P2B67 P2B68