AutoCodes – GMC – B0429 GMC

B0429 GMC 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 GMC 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 2,857

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

What does this mean?

What are the Possible Causes of the DTC B0429 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the B0429 GMC 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 GMC Code

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

- Common symptoms include poor heater performance, fluctuating interior temperatures, and possible issues with the vehicle's HVAC system.

2. What are the potential causes of OBDII code B0429 GMC being triggered?

- The code may be triggered by a faulty auxiliary air temperature actuator, wiring issues, or a malfunction in the HVAC control module.

3. How can I diagnose the cause of OBDII code B0429 GMC on my GMC vehicle?

- Diagnosis involves checking the auxiliary air temperature actuator for proper operation, inspecting related wiring for damage, and using a scan tool to retrieve the code and data.

4. Can a DIY enthusiast repair OBDII code B0429 GMC at home?

- While some simple repairs like checking and repairing wiring connections may be possible for DIYers, diagnosing and replacing the auxiliary air temperature actuator may require professional help.

5. Are there any tips for repairing OBDII code B0429 GMC efficiently?

- It's recommended to follow the manufacturer's diagnostic and repair procedures, use quality replacement parts, and ensure all repairs are done accurately to avoid further issues.

6. Will driving with OBDII code B0429 GMC illuminated cause any harm to my vehicle?

- While the code itself may not cause immediate harm, ignoring the underlying issue could lead to poor HVAC performance and discomfort while driving.

7. How long does it typically take to repair OBDII code B0429 GMC?

- Repair times can vary depending on the exact cause of the code and the complexity of the repair, but it may take a few hours to a full day in some cases.

8. Can resetting the OBDII system clear OBDII code B0429 GMC permanently?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return after some driving cycles.

9. Is it safe to drive my GMC vehicle with OBDII code B0429 GMC present?

- It is generally safe to drive with the code present, but it's recommended to address the issue promptly to avoid potential discomfort and HVAC system problems.

10. How much can I expect to pay for repairing OBDII code B0429 GMC at a professional auto repair shop?

- Repair costs can vary depending on the exact cause of the code, labor rates in your area, and parts needed, but you can expect to pay anywhere from $100 to $500 or more for the repair.