AutoCodes – Pontiac – B0428 Pontiac

B0428 Pontiac 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 Pontiac 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 1,277

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

What does this mean?

What are the Possible Causes of the DTC B0428 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac 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 Pontiac Code

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

- Common symptoms include issues with the heating and cooling functions in the vehicle, such as inconsistent air temperature output or the HVAC system not responding properly.

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

- The most common cause is a malfunctioning auxiliary air temperature actuator, which can be due to a faulty actuator motor, wiring issues, or a problem with the actuator control circuit.

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

- Diagnosing this code often involves using a scan tool to retrieve the specific error code and then testing the auxiliary air temperature actuator for proper operation. Checking the actuator motor and related wiring for faults is also recommended.

4. What are some repair tips for fixing the OBDII code B0428 in a Pontiac associated with the Auxiliary Air Temperature Actuator?

- Repair tips include inspecting and repairing any damaged wiring, replacing the faulty auxiliary air temperature actuator if necessary, and ensuring proper connection and functionality of the actuator motor.

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

- It is generally not recommended to drive the vehicle with this code unresolved, as it can lead to discomfort due to inconsistent air temperature control and potential issues with the HVAC system.

6. How much does it typically cost to repair the OBDII code B0428 Pontiac linked to the Auxiliary Air Temperature Actuator?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the auxiliary air temperature actuator, which can range from $150 to $300 including parts and labor.

7. Are there any DIY solutions for fixing the OBDII code B0428 in a Pontiac related to the Auxiliary Air Temperature Actuator?

- DIY solutions may include checking and repairing any visible wiring issues, but for proper diagnosis and repair of the actuator itself, it is recommended to consult a professional mechanic.

8. How urgent is it to address the OBDII code B0428 Pontiac associated with the Auxiliary Air Temperature Actuator?

- While the vehicle may still be operable with this code present, it is important to address the issue in a timely manner to ensure proper heating and cooling functions and prevent further damage to the HVAC system.

9. Can weather conditions affect the appearance of the OBDII code B0428 in a Pontiac related to the Auxiliary Air Temperature Actuator?

- Extreme temperature fluctuations or exposure to moisture can potentially exacerbate issues with the auxiliary air temperature actuator, leading to the triggering of the B0428 code.

10. Is the OBDII code B0428 in a Pontiac always specifically related to the Auxiliary Air Temperature Actuator?

- Yes, OBDII code B0428 in a Pontiac is specifically related to issues with the Auxiliary Air Temperature Actuator within the HVAC system.

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