AutoCodes – GMC – B0423 2017 GMC Sierra

B0423 2017 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 2017 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 269

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 2017 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 2017 GMC Sierra - Right Temperature Control Feedback Circuit - AutoCodes.com — B0423 2017 GMC Sierra Code - Right Temperature Control Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC B0423 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the B0423 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 2017 GMC Sierra Code

1. What does OBDII code B0423 for a 2017 GMC Sierra mean?

The B0423 code indicates an issue with the Right Temperature Control Feedback Circuit in the vehicle's HVAC system.

2. What are the common symptoms of OBDII code B0423 on a 2017 GMC Sierra?

Common symptoms include inconsistent or incorrect temperature output from the right side HVAC vents, the inability to adjust the temperature on the right side, or the climate control system not responding properly.

3. What are the possible causes of OBDII code B0423 on a 2017 GMC Sierra?

Potential causes of the B0423 code can include a faulty temperature control actuator, damaged wiring or connectors in the feedback circuit, or a malfunctioning HVAC control module.

4. How can I diagnose the OBDII code B0423 on my 2017 GMC Sierra?

Diagnosing the B0423 code typically involves using a scan tool to retrieve the specific error code and then conducting further testing to pinpoint the exact cause, such as checking the temperature control actuator and inspecting the wiring for any visible damage.

5. Can I continue driving my 2017 GMC Sierra with OBDII code B0423 present?

While the vehicle may still be operable with the B0423 code, it is recommended to address the issue promptly to ensure optimal functionality of the HVAC system and prevent potential long-term damage.

6. How can I repair OBDII code B0423 on my 2017 GMC Sierra?

Repairing the B0423 code often involves replacing the faulty temperature control actuator, repairing any damaged wiring or connectors, or resetting the HVAC control module to clear the error code.

7. Are there any DIY tips for fixing OBDII code B0423 on a 2017 GMC Sierra?

If you have experience with automotive repairs, you may attempt to replace the temperature control actuator yourself after consulting the vehicle's repair manual for guidance. However, for more complex issues, it is recommended to seek professional help.

8. Will resetting the OBDII code B0423 on my 2017 GMC Sierra make it go away permanently?

Resetting the B0423 code may temporarily clear the error, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and fix the root cause of the problem for a permanent solution.

9. How much does it typically cost to repair OBDII code B0423 on a 2017 GMC Sierra?

The cost of repairing the B0423 code can vary depending on the specific cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is advisable to obtain quotes from different mechanics for an accurate estimate.

10. Can OBDII code B0423 on a 2017 GMC Sierra affect vehicle performance?

While the B0423 code primarily relates to the HVAC system, unresolved issues with the temperature control feedback circuit can potentially impact overall comfort and convenience in the vehicle, but it should not directly affect the performance of the engine or other critical systems.