AutoCodes – GMC – B0423 2015 GMC Sierra

B0423 2015 GMC Sierra Code - Right Temperature Control Feedback Circuit

Quick Answer

The Heating, Ventilation, and Air Conditioning (HVAC) control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Common causes include Faulty Passenger Air Temperature Actuator, Passenger Air Temperature Actuator harness is open or shorted, Passenger 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: B0423 2015 GMC Sierra indicates Right Temperature Control Feedback Circuit.
Common causes: Common causes include Faulty Passenger Air Temperature Actuator, Passenger Air Temperature Actuator harness is open or shorted, Passenger 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 434

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 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0423 2015 GMC Sierra Description

The Heating, Ventilation, and Air Conditioning (HVAC) control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The control circuit uses either a 0, 2.5 or 5-volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions.

OBDII Code B0423 2015 GMC Sierra - Right Temperature Control Feedback Circuit - AutoCodes.com — B0423 2015 GMC Sierra Code - Right Temperature Control Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC B0423 2015 GMC Sierra?

Faulty Passenger Air Temperature Actuator
Passenger Air Temperature Actuator harness is open or shorted
Passenger Air Temperature Actuator circuit poor electrical connection

How to Fix the DTC B0423 2015 GMC Sierra?

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 does this mean?

Code Tech Notes

B0423:02 Temperature Control 2 Feedback Circuit Short to Ground
B0423:05 Temperature Control 2 Feedback Circuit Short to Battery or Open
B0423:61 Temperature Control 2 Circuit Actuator Stuck

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0423 2015 GMC Sierra 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 B0423 2015 GMC Sierra code?

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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 B0423 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B0423 in a 2015 GMC Sierra related to the Right Temperature Control Feedback Circuit?

- Common symptoms include issues with the right-side temperature control not responding correctly, inconsistent temperature output, or the climate control system not functioning properly.

2. What does the OBDII code B0423 in a 2015 GMC Sierra indicate?

- The code B0423 indicates a problem with the Right Temperature Control Feedback Circuit in the vehicle's HVAC system.

3. What are the possible causes of OBDII code B0423 in a 2015 GMC Sierra?

- Possible causes of this code include a faulty temperature control actuator, wiring issues, a malfunctioning HVAC control module, or a problem with the blend door.

4. How can I diagnose the issue causing OBDII code B0423 in my 2015 GMC Sierra?

- Diagnosing the issue typically involves using a scan tool to retrieve the code, testing the temperature control actuator, checking the wiring for any damage, and ensuring proper communication between the HVAC control module and other components.

5. Can I continue to drive my 2015 GMC Sierra with OBDII code B0423?

- It is generally not recommended to continue driving the vehicle with this code, as it can lead to further HVAC system issues and discomfort while driving.

6. How can I repair OBDII code B0423 in my 2015 GMC Sierra?

- Repairing this code may involve replacing the faulty temperature control actuator, repairing any damaged wiring, resetting the HVAC system, or reprogramming the HVAC control module.

7. Is it possible to reset the OBDII code B0423 in a 2015 GMC Sierra without repairs?

- While clearing the code may temporarily turn off the Check Engine Light, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Are there any DIY tips for troubleshooting OBDII code B0423 in a 2015 GMC Sierra?

- DIY troubleshooting tips may include checking and securing the wiring connections, ensuring the blend door is moving freely, and inspecting the temperature control actuator for proper operation.

9. How much does it typically cost to repair OBDII code B0423 in a 2015 GMC Sierra at a dealership or repair shop?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from $200 to $500 or more, including parts and labor.

10. Can regular maintenance help prevent OBDII code B0423 in a 2015 GMC Sierra?

- While regular maintenance cannot guarantee the prevention of this specific code, keeping up with routine HVAC system inspections and addressing any issues promptly can help reduce the likelihood of encountering such problems.