AutoCodes
 
OBDII Code List
 
B0408

B0408 - Front Temperature Control Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

Possible causes

  • Faulty Air Temperature Actuator
  • Air Temperature Actuator harness is open or shorted
  • Air Temperature Actuator circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
  What does this mean?

Possible symptoms

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

B0408 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 B0408 - Front Temperature Control Circuit - AutoCodes.com

B0408 Information for specific makes

Need more help?

Get the B0408 code diagnosed by a professional: Find a repair shop in your area

Related Information

B0408 Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the B0408 code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧