P26D5

Engine Coolant Pump Supply Voltage Circuit High

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$33–167 (est.)

Symptoms

Check Engine light comes on
Engine overheating
Unstable engine operation
Reduced engine performance
Coolant pump noise

Causes

Short circuit in coolant pump circuit
Faulty pump relay
Problems with wiring or harness
Coolant pump malfunction
Problems with the engine control unit (ECU)

How to Fix

Check the voltage in the coolant pump circuit
Inspect the wiring and wiring harness for damage
Check coolant pump relay
Replace the coolant pump if necessary
Check and, if necessary, replace the engine control unit (ECU)

Related codes

P26D4 P26D6 P26D7