Engine-Codes
 
OBDII Code List
 
B0429 CADILLAC

B0429 CADILLAC - Auxiliary Air Temperature Actuator Range/Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

B0429 CADILLAC Possible Causes

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

Cost of diagnosing the B0429 CADILLAC code

    Labor: 1.0

    The cost of diagnosing the B0429 CADILLAC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

B0429 CADILLAC Possible Symptoms

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

B0429 CADILLAC Meaning

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) actuators are a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5-volt reference, position signal, and 2 control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to coordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the HVAC control module grounds one of the control circuits while providing the other with 12 volts. The auxiliary HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometers adjustable contact changes the door position signal between 0-5 volts. This signal then is converted into a count value where as 1 volt will equal 51 counts.

The auxiliary HVAC control module calibrates the travel range of the HVAC door actuators when it is initially powered by the battery positive voltage circuit. During calibration, the module commands the actuators in each direction until door travel is stopped. The module stores the minimum door positions and the maximum door positions of each actuator into memory. The total travel range is calculated by subtracting the minimum door position from the maximum door position.

OBDII Code B0429 CADILLAC - Auxiliary Air Temperature Actuator Range/Performance - Engine-Codes.com

Related Information