P25AF

Coolant Temperature Control Module Requested MIL Illumination

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Malfunction indicator lamp (MIL) is on
Unstable engine operation
Engine overheating
Reduced efficiency of the interior heating system
Increased fuel consumption

Causes

Coolant temperature sensor malfunction
Open or short circuit in the sensor circuit
Temperature control module malfunction
Coolant leak
Thermostat malfunction

How to Fix

Check coolant level and leaks
Check the condition and operation of the thermostat
Check the coolant temperature sensor and its circuit
Scan the system for additional trouble codes
If necessary, replace the temperature sensor or control module

Related codes

P0115 P0116 P0117 P0118