P2D27

Coolant Pump F Control Circuit Performance/Stuck Off

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Engine overheating
Unstable coolant temperature
Check Engine Light Is On
Reduced engine performance
Noises from the coolant pump

Causes

Coolant pump failure
Open or short circuit in control circuit
Damaged connectors or corrosion
Engine control unit (ECU) malfunction
Pump relay problems

How to Fix

Check fuses and pump relays
Inspect wiring and connectors for damage
Check resistance and voltage in the pump circuit
Replace the coolant pump if necessary
Reflash or replace the ECU if other causes are excluded

Related codes

P2D26 P2D28 P0117