AutoCodes – Saturn – B0428 Saturn

B0428 Saturn 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 Saturn 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 1,042

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

What does this mean?

What are the Possible Causes of the DTC B0428 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 B0428 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 B0428 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.

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Need Help with the Code?

Get the B0428 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 B0428 Saturn Code

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

- Common symptoms include issues with the heating or cooling system, reduced airflow, and inconsistent temperature control inside the vehicle.

2. What can cause the OBDII code B0428 related to the Auxiliary Air Temperature Actuator in a Saturn?

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

3. How can I diagnose the OBDII code B0428 in my Saturn for the Auxiliary Air Temperature Actuator issue?

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

4. What are some repair tips for resolving the OBDII code B0428 in a Saturn with the Auxiliary Air Temperature Actuator problem?

- Repair tips include replacing the faulty temperature actuator, repairing any damaged wiring, resetting the control module, and ensuring proper calibration of the system.

5. Can I drive my Saturn with the OBDII code B0428 related to the Auxiliary Air Temperature Actuator?

- It is not recommended to drive the vehicle with this code, as it can lead to discomfort due to temperature control issues and may affect the overall functionality of the HVAC system.

6. Is it possible to reset the OBDII code B0428 in a Saturn without fixing the Auxiliary Air Temperature Actuator problem?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent further problems with the system.

7. How much does it typically cost to repair the OBDII code B0428 in a Saturn caused by the Auxiliary Air Temperature Actuator?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve parts and labor expenses ranging from $100 to $500 or more.

8. Are there any preventive maintenance steps I can take to avoid the OBDII code B0428 related to the Saturn's Auxiliary Air Temperature Actuator?

- Regularly servicing the HVAC system, checking for any unusual temperature control issues, and addressing any problems promptly can help prevent this code from occurring.

9. Will fixing the OBDII code B0428 in my Saturn improve fuel efficiency or performance?

- While resolving the code can help maintain proper HVAC system operation, it may not directly impact fuel efficiency or performance of the vehicle.

10. Can I replace the Auxiliary Air Temperature Actuator in my Saturn myself, or should I seek professional help?

- Depending on your experience and tools available, you may be able to replace the actuator yourself. However, seeking professional help is recommended for accurate diagnosis and proper repair.