AutoCodes – Buick – B0429 Buick

B0429 Buick Code - Auxiliary Air Temperature Actuator Range/Performance

Quick Answer

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) actuators are a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. Common causes include Faulty Auxiliary Air Temperature Actuator, Auxiliary Air Temperature Actuator harness is open or shorted, Auxiliary Air Temperature Actuator circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0429 Buick indicates Auxiliary Air Temperature Actuator Range/Performance.
Common causes: Common causes include Faulty Auxiliary Air Temperature Actuator, Auxiliary Air Temperature Actuator harness is open or shorted, Auxiliary Air Temperature Actuator circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 745

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0429 Buick Description

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 Buick - Auxiliary Air Temperature Actuator Range/Performance - AutoCodes.com — B0429 Buick Code - Auxiliary Air Temperature Actuator Range/Performance

What does this mean?

What are the Possible Causes of the DTC B0429 Buick?

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

How to Fix the DTC B0429 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0429 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B0429 Buick Code

1. What are the common symptoms of OBDII code B0429 in a Buick related to the Auxiliary Air Temperature Actuator?

- Common symptoms include poor heating or cooling performance in the vehicle, inconsistent temperature control, and potential issues with the HVAC system.

2. What are the possible causes of OBDII code B0429 in a Buick related to the Auxiliary Air Temperature Actuator?

- Possible causes may include a faulty auxiliary air temperature actuator, wiring issues, a malfunctioning HVAC control module, or a problem with the temperature sensor.

3. How can I diagnose OBDII code B0429 in my Buick related to the Auxiliary Air Temperature Actuator?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the auxiliary air temperature actuator for proper operation, inspecting the wiring for any damage, and testing the HVAC control module.

4. Can I continue driving my Buick with OBDII code B0429 related to the Auxiliary Air Temperature Actuator?

- It is generally not recommended to continue driving the vehicle with this code, as it can lead to discomfort due to inconsistent temperature control and may indicate underlying issues with the HVAC system.

5. How can I repair OBDII code B0429 in my Buick related to the Auxiliary Air Temperature Actuator?

- Repairs may involve replacing the faulty auxiliary air temperature actuator, repairing any damaged wiring, resetting the HVAC control module, or addressing any issues with the temperature sensor.

6. Are there any DIY tips for troubleshooting OBDII code B0429 in a Buick related to the Auxiliary Air Temperature Actuator?

- DIY tips include checking the fuse related to the HVAC system, ensuring proper power supply to the auxiliary air temperature actuator, and inspecting for any visible signs of damage or corrosion in the components.

7. How critical is it to address OBDII code B0429 in a Buick related to the Auxiliary Air Temperature Actuator promptly?

- It is recommended to address this code promptly to prevent further issues with the HVAC system and ensure optimal temperature control inside the vehicle.

8. Can weather or environmental factors trigger OBDII code B0429 in a Buick related to the Auxiliary Air Temperature Actuator?

- While weather or environmental factors may not directly trigger this code, extreme temperatures or humidity levels can exacerbate existing issues with the auxiliary air temperature actuator.

9. Is it possible for OBDII code B0429 related to the Auxiliary Air Temperature Actuator to recur after repairs?

- If the underlying cause of the code is not properly addressed during repairs, there is a possibility for the code to recur. Thorough diagnosis and repair are essential to prevent recurrence.

10. How can regular maintenance help prevent OBDII code B0429 in a Buick related to the Auxiliary Air Temperature Actuator?

- Regular maintenance, including checking the HVAC system components during routine inspections, can help detect any issues early on and prevent the occurrence of OBDII code B0429 related to the Auxiliary Air Temperature Actuator.