P026F

Coolant Thermostat Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

The engine takes a long time to warm up
Engine overheating
Unstable engine temperature
Increased fuel consumption

Causes

Stuck thermostat (open or closed)
Coolant temperature sensor malfunction
Problems with wiring or connectors
Mechanical damage to the thermostat

How to Fix

Check the operation of the thermostat (engine warming up and temperature control)
Diagnose the coolant temperature sensor
Check the integrity of the wiring harness and connectors
Replace thermostat if necessary

Related codes

P0128 P0115 P0116