P2CF2

Auxiliary Thermostat B Stuck Closed

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Engine overheating in certain operating modes
Insufficient heating of the car interior
Extended engine warm-up time
Unstable engine operation when temperature changes
Check Engine Light Illuminates

Causes

Mechanical jamming of the thermostat
Malfunction of the electric heating element (if the thermostat is heated)
Problems with wiring to the thermostat
Corroded or dirty thermostat
Engine control unit malfunction

How to Fix

Check the condition of the thermostat visually
Test the operation of the thermostat at different temperatures
Check the integrity of wiring and connectors
Replace a faulty thermostat
Clean the cooling system if necessary

Related codes

P2CF0 P2CF1 P2CF3