AutoCodes – Cadillac – B0429 Cadillac

B0429 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,211

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC B0429 Cadillac?

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 Cadillac?

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 Cadillac 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.

Need more information about the B0429 Cadillac code?

Need more information on how to fix the B0429 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0429 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 Cadillac Code

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

- Common symptoms include poor heating or cooling performance in the vehicle, inconsistent temperature control, and reduced overall comfort inside the car.

2. What are the possible causes of OBDII code B0429 in a Cadillac?

- The code B0429 typically indicates a fault with the Auxiliary Air Temperature Actuator, which can be caused by a malfunctioning actuator motor, wiring issues, or a faulty temperature sensor.

3. How can I diagnose the OBDII code B0429 in my Cadillac?

- Diagnosis usually involves using an OBDII scanner to retrieve the specific code, followed by inspecting the Auxiliary Air Temperature Actuator, checking the wiring connections, and testing the actuator's functionality.

4. What are some repair tips for fixing OBDII code B0429 in a Cadillac?

- Repair tips may include replacing the faulty Auxiliary Air Temperature Actuator, repairing any damaged wiring or connectors, resetting the system after repairs, and clearing the error code with the OBDII scanner.

5. Can I drive my Cadillac with the OBDII code B0429 present?

- It is generally not recommended to drive with unresolved OBDII codes, as they can indicate underlying issues that may affect the vehicle's performance or safety. It's best to address the problem promptly.

6. How serious is OBDII code B0429 in a Cadillac?

- While the code itself may not cause immediate harm to the vehicle, ignoring it can lead to discomfort, inefficient heating or cooling, and potential strain on the HVAC system components over time.

7. Is it possible to reset the OBDII code B0429 in a Cadillac without making repairs?

- Resetting the code without addressing the underlying issue may temporarily clear the error, but the problem will likely resurface until the root cause is fixed. It's best to diagnose and repair the issue properly.

8. Can a DIY enthusiast fix OBDII code B0429 in a Cadillac, or is professional help necessary?

- Depending on your mechanical skills and tools available, it is possible to fix the issue yourself by replacing the Auxiliary Air Temperature Actuator. However, if you are unsure, it's recommended to seek professional help.

9. Will replacing the Auxiliary Air Temperature Actuator resolve the OBDII code B0429 in a Cadillac?

- In many cases, replacing the faulty actuator will resolve the B0429 code, especially if the actuator motor or temperature sensor is the root cause of the issue. It is crucial to follow proper diagnostic procedures.

10. How can I prevent OBDII code B0429 from appearing in my Cadillac in the future?

- Regular maintenance, checking for wiring issues, and addressing any HVAC system problems promptly can help prevent the recurrence of OBDII code B0429 in your Cadillac.