AutoCodes – GMC – B0423 2018 GMC Sierra

B0423 2018 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 2018 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 309

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 2018 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 2018 GMC Sierra - Right Temperature Control Feedback Circuit - AutoCodes.com — B0423 2018 GMC Sierra Code - Right Temperature Control Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC B0423 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the B0423 2018 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 2018 GMC Sierra Code

1. What are common symptoms of OBDII code B0423 in a 2018 GMC Sierra?

The common symptoms include inconsistent temperature control on the right side of the vehicle, the inability to adjust the temperature on the right side, and possibly a malfunctioning climate control system.

2. What does the OBDII code B0423 for the right temperature control feedback circuit indicate in a 2018 GMC Sierra?

This code indicates a malfunction in the feedback circuit that controls the right-side temperature in the vehicle's climate control system.

3. What are the possible causes of OBDII code B0423 in a 2018 GMC Sierra?

Possible causes include a faulty temperature control actuator, wiring issues in the feedback circuit, a defective climate control module, or a malfunctioning HVAC control panel.

4. How can I diagnose the right temperature control feedback circuit issue related to OBDII code B0423 in my 2018 GMC Sierra?

Diagnosing this issue usually involves using a scan tool to retrieve the specific code, testing the temperature control actuator, checking the wiring for continuity and damage, and inspecting the climate control module for any faults.

5. What are the recommended repair tips for resolving OBDII code B0423 in a 2018 GMC Sierra?

Repair tips may include replacing the faulty temperature control actuator, repairing or replacing damaged wiring in the feedback circuit, resetting the climate control module, or recalibrating the HVAC control panel.

6. Can I continue driving my 2018 GMC Sierra with OBDII code B0423 without immediate repair?

While the vehicle may still be operable, it is recommended to address the issue promptly to avoid potential discomfort due to inconsistent temperature control and prevent further damage to the climate control system.

7. How much does it typically cost to repair OBDII code B0423 in a 2018 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue. It may range from a few hundred dollars for a simple fix like replacing a faulty actuator to more significant costs if the climate control module needs replacement.

8. Is OBDII code B0423 a common issue in 2018 GMC Sierra vehicles?

While it may not be as common as some other OBDII codes, issues related to the right temperature control feedback circuit can occur in 2018 GMC Sierra vehicles, especially as they age and components wear out.

9. Can weather or climate conditions impact the occurrence of OBDII code B0423 in a 2018 GMC Sierra?

Extreme temperature fluctuations or prolonged exposure to harsh weather conditions can potentially worsen existing issues with the right temperature control feedback circuit, leading to the triggering of OBDII code B0423.

10. How can I prevent OBDII code B0423 from recurring in my 2018 GMC Sierra after repair?

Regular maintenance of the climate control system, promptly addressing any temperature control issues, and ensuring proper functioning of all related components can help prevent the recurrence of OBDII code B0423 in the future.