B0409

Temperature Control 1 Circuit Range

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Incorrect operation of climate control
Unstable temperature in the cabin
Error indication on the instrument panel

Causes

Temperature sensor malfunction
Open or short circuit in wiring harness
Problems with the climate control unit
Corrosion of contacts or connectors

How to Fix

Check the temperature sensor for damage
Check the integrity of the wiring harness and contacts
Scan the control unit for additional errors
Replace temperature sensor if necessary

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