B0408

Main Temperature Control Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Incorrect operation of the climate system
Lack of response to temperature changes
Unstable temperature in the cabin

Causes

Open or short circuit in temperature control circuit
Temperature sensor malfunction
Problems with the climate control unit
Wiring harness damage

How to Fix

Check the integrity of the wiring harness in the temperature control circuit
Test the temperature sensor to specifications
Check the operation of the climate control unit
Replace faulty components

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