AutoCodes – GMC – B0423 2016 GMC Sierra

B0423 2016 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 2016 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 476

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 2016 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 2016 GMC Sierra - Right Temperature Control Feedback Circuit - AutoCodes.com — B0423 2016 GMC Sierra Code - Right Temperature Control Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC B0423 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the B0423 2016 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 2016 GMC Sierra Code

1. What does OBDII code B0423 for a 2016 GMC Sierra indicate?

The code B0423 signifies a problem 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 2016 GMC Sierra?

Common symptoms include inconsistent heating or cooling on the right side of the vehicle, the inability to adjust the temperature properly, or the HVAC system blowing hot or cold air unexpectedly.

3. What are the possible causes of OBDII code B0423 on a 2016 GMC Sierra?

Potential causes of this code include a faulty temperature control actuator, a wiring issue in the circuit, a defective HVAC control module, or a malfunctioning temperature sensor.

4. How can I diagnose the issue related to OBDII code B0423 on my 2016 GMC Sierra?

Diagnosing the problem typically involves using a scan tool to retrieve the error code, checking the temperature control actuator for proper function, inspecting the wiring for damage, and testing the HVAC control module and temperature sensor.

5. Can I continue to drive my 2016 GMC Sierra with OBDII code B0423?

While the vehicle may still be operable with this code present, it is recommended to address the issue promptly to avoid potential discomfort or further damage to the HVAC system.

6. How can I repair OBDII code B0423 on my 2016 GMC Sierra?

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

7. Are there any DIY tips for fixing OBDII code B0423 on a 2016 GMC Sierra?

DIY enthusiasts with automotive repair experience may attempt to replace the temperature control actuator or check the wiring connections themselves, but for complex issues, it's advisable to seek professional help.

8. How much does it typically cost to fix OBDII code B0423 on a 2016 GMC Sierra?

The cost of repairing this code can vary depending on the specific issue, parts needed, and labor rates in your area. It's recommended to obtain quotes from local mechanics or dealerships for an accurate estimate.

9. Can resetting the OBDII system clear the B0423 code on a 2016 GMC Sierra?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's best to diagnose and fix the root cause of the problem.

10. Is OBDII code B0423 a common issue in 2016 GMC Sierra vehicles?

While the occurrence of this code may vary, issues related to the Right Temperature Control Feedback Circuit can be encountered in some 2016 GMC Sierra models, especially as the vehicle ages. Regular maintenance can help prevent such issues.