B0409 CADILLAC - Temperature Control 1 Circuit Range

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3 What is this?

Table of contents

Possible Causes
How To Fix
Cost to Diagnose
Description
Comments
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B0409 CADILLAC Possible Causes

What does this mean?

Faulty Left Air Temperature Actuator
Left Air Temperature Actuator harness is open or shorted
Left Air Temperature Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How do I fix code B0409 CADILLAC?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

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Cost of diagnosing the B0409 CADILLAC code

Labor: 1.0

The cost of diagnosing the B0409 CADILLAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B0409 CADILLAC Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. With the switches and dials on the HVAC controls, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module via serial data. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors move the appropriate doors into the calculated positions, in order to reach the desired positions.

OBDII Code B0409 Cadillac - Temperature Control 1 Circuit Range - AutoCodes.com

More Information

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Comments

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Repair Importance Level: 3

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level: 3

1=Easy 2=Moderate 3=Hard What is this?