AutoCodes – Chevrolet – B0428 Chevrolet

B0428 Chevrolet Code - Auxiliary Air Temperature Actuator

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: B0428 Chevrolet indicates Auxiliary Air Temperature Actuator.
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 5,739

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 B0428 Chevrolet 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 B0428 Chevrolet - Auxiliary Air Temperature Actuator - AutoCodes.com — B0428 Chevrolet Code - Auxiliary Air Temperature Actuator

What does this mean?

What are the Possible Causes of the DTC B0428 Chevrolet?

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 B0428 Chevrolet?

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 B0428 Chevrolet 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 more information on how to fix the B0428 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0428 Chevrolet 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 B0428 Chevrolet Code

1. What are the common symptoms of OBDII code B0428 in a Chevrolet related to the Auxiliary Air Temperature Actuator?

- Common symptoms include incorrect air temperature readings, poor HVAC system performance, and potential issues with the vehicle's heating and cooling functions.

2. What typically causes the OBDII code B0428 related to the Auxiliary Air Temperature Actuator in a Chevrolet?

- The code is often triggered by a faulty auxiliary air temperature actuator, wiring issues, or a malfunctioning HVAC control module.

3. How can I diagnose the OBDII code B0428 in my Chevrolet related to the Auxiliary Air Temperature Actuator?

- Diagnosis involves using a scan tool to retrieve the specific trouble code, checking the auxiliary air temperature actuator for proper functioning, and inspecting related wiring for any faults.

4. Can I continue driving my Chevrolet with the OBDII code B0428 related to the Auxiliary Air Temperature Actuator?

- While the vehicle may still be operational, it is recommended to address the issue promptly to avoid potential HVAC system malfunctions and discomfort while driving.

5. What are some DIY tips for repairing the OBDII code B0428 in a Chevrolet associated with the Auxiliary Air Temperature Actuator?

- DIY repair tips include checking and replacing the auxiliary air temperature actuator if faulty, ensuring proper wiring connections, and resetting the trouble code with a scan tool after repairs.

6. Is it necessary to visit a mechanic for fixing the OBDII code B0428 related to the Auxiliary Air Temperature Actuator in my Chevrolet?

- While some DIY repairs are possible, complex issues with the actuator or HVAC system may require professional diagnosis and repair by a qualified mechanic.

7. How much can I expect to pay to fix the OBDII code B0428 related to the Auxiliary Air Temperature Actuator in a Chevrolet?

- Repair costs can vary depending on the extent of the issue, but expenses may include parts replacement, labor charges, and diagnostic fees, potentially ranging from $100 to $500 or more.

8. What happens if I ignore the OBDII code B0428 related to the Auxiliary Air Temperature Actuator in my Chevrolet?

- Ignoring the code may lead to continued HVAC system malfunctions, inaccurate temperature readings, and discomfort while driving, potentially impacting overall vehicle comfort and convenience.

9. Is the OBDII code B0428 in a Chevrolet related to the Auxiliary Air Temperature Actuator a common issue?

- Yes, the B0428 code related to the Auxiliary Air Temperature Actuator is a relatively common problem in Chevrolet vehicles, especially in older models or those with high mileage.

10. Can a faulty Auxiliary Air Temperature Actuator triggering the OBDII code B0428 affect the overall performance of my Chevrolet?

- While the issue may not directly affect engine performance, a malfunctioning Auxiliary Air Temperature Actuator can impact the comfort and functionality of the HVAC system in the vehicle.