AutoCodes – Saturn – B0429 Saturn

B0429 Saturn 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 Saturn 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 770

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

What does this mean?

What are the Possible Causes of the DTC B0429 Saturn?

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 Saturn?

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 Saturn 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 Saturn code?

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

Need Help with the Code?

Get the B0429 Saturn 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 Saturn Code

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

- Common symptoms include poor heater performance, fluctuating cabin temperature, or a malfunctioning air conditioning system.

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

- The code B0429 may be triggered by a faulty auxiliary air temperature actuator, a wiring issue, or a problem with the HVAC control module.

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

- You can diagnose the code by using an OBDII scanner to retrieve the specific error code and then inspecting the auxiliary air temperature actuator and related components for any visible damage or issues.

4. Can I continue driving my Saturn with the OBDII code B0429 present?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to avoid potential discomfort from heating or cooling system malfunctions.

5. What is the typical repair cost for fixing OBDII code B0429 in a Saturn?

- The repair cost can vary depending on the exact cause of the issue, but it may range from around $200 to $500, including parts and labor.

6. Are there any DIY repair tips for resolving the OBDII code B0429 in a Saturn?

- DIY enthusiasts can attempt to replace the auxiliary air temperature actuator themselves by following online guides or consulting the vehicle's repair manual.

7. How long does it usually take to repair OBDII code B0429 in a Saturn?

- The repair time can vary based on the complexity of the issue and the expertise of the mechanic, but it typically takes around 1-2 hours to fix this problem.

8. Can weather conditions affect the triggering of OBDII code B0429 in a Saturn?

- Extreme temperature fluctuations or prolonged exposure to harsh weather conditions can potentially exacerbate issues related to the auxiliary air temperature actuator and trigger the code.

9. What steps should I take if the OBDII code B0429 keeps coming back after repairs?

- If the code persists after repairs, it is recommended to recheck the components, verify the wiring connections, or consult a professional mechanic for further diagnosis.

10. Is it necessary to reset the OBDII system after fixing the code B0429 in a Saturn?

- Yes, it is advisable to reset the OBDII system after resolving the issue to clear the error code and ensure the proper functioning of the vehicle's diagnostic system.