AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Gmc - B0409 GMC

B0409 GMC Code - Temperature Control 1 Circuit Range

Updated Mar 11, 2021
- Code Popularity: 706 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

|B0409 GMC code possible causes

  • 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 GMC code?

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.

|Cost of diagnosing B0409 GMC code

Labor: 1.0

The cost of diagnosing the B0409 GMC 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.

|What are B0409 GMC code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|B0409 GMC code 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 Gmc - Temperature Control 1 Circuit Range - AutoCodes.com
Temperature Control 1 Circuit Range

|Need more information with the B0409 GMC code?

Need more information on how to fix the B0409 GMC code?
Get Access to Factory Service Manuals

|Need help with a B0409 GMC code?

Get the B0409 Gmc code diagnosed by a professional: Find a repair shop in your area

|B0409 GMC code comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B0409 Gmc code? Have you replaced any parts?
Any information is appreciated. Thanks