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Engine-Codes – GMC – B0423 2017 GMC Sierra

B0423 2017 GMC Sierra Code - Right Temperature Control Feedback Circuit

Quick Answer

The B0423 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the right temperature control feedback circuit. Common causes include Faulty temperature control actuator, Wiring issues in the right temperature control feedback circuit, Defective temperature control module. 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 temperature control actuator, Wiring issues in the right temperature control feedback circuit, Defective temperature control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B0423 2017 GMC Sierra Description

The B0423 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the right temperature control feedback circuit. This code indicates that there is a malfunction in the feedback circuit for the right temperature control in the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. The right temperature control feedback circuit is responsible for regulating the temperature on the passenger side of the vehicle. When this circuit malfunctions, it can lead to issues with maintaining the desired temperature in the cabin.

OBDII Code B0423 2017 GMC Sierra - Right Temperature Control Feedback Circuit
B0423 2017 GMC Sierra Code - Right Temperature Control Feedback Circuit

Common Causes of B0423 2017 GMC Sierra

  1. Faulty temperature control actuator
  2. Wiring issues in the right temperature control feedback circuit
  3. Defective temperature control module
  4. Problem with the HVAC control head

Symptoms of B0423 2017 GMC Sierra

  1. Inconsistent temperature control on the passenger side
  2. Hot or cold air blowing intermittently
  3. Temperature not adjusting according to settings
  4. Discomfort for passengers due to temperature fluctuations

How to Fix B0423 2017 GMC Sierra

  1. Begin by diagnosing the specific cause of the B0423 code using a scan tool to identify the faulty component.
  2. Inspect the wiring in the right temperature control feedback circuit for any damage or loose connections. Repair or replace as needed.
  3. Test the temperature control actuator to ensure proper operation. Replace if faulty.
  4. Check the temperature control module and HVAC control head for any malfunctions. Replace if necessary.
  5. Clear the DTC and test the HVAC system to verify that the issue has been resolved.

Cost to Fix B0423 2017 GMC Sierra

The typical repair costs for addressing the B0423 code in a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $400. It's important to note that diagnosis time and labor rates can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local auto repair shops for a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for B0423 2017 GMC Sierra

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

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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.

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