AutoCodes – Generic – B0423

B0423 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 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 27,893

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

What does this mean?

What are the Possible Causes of the DTC B0423?

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?

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 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 code?

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

Need Help with the Code?

Get the B0423 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0423 Buick — Right Temperature Control Feedback Circuit
B0423 Cadillac — Right Temperature Control Feedback Circuit
B0423 Chevrolet — Right Temperature Control Feedback Circuit
B0423 GMC — Right Temperature Control Feedback Circuit
B0423 Volkswagen — Right Temperature Control Feedback Circuit

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 Code

1. What are the common symptoms of OBDII code B0423 (Right Temperature Control Feedback Circuit)?

The common symptoms of code B0423 include inconsistent temperature control on the right side of the vehicle, hot air blowing out when cold air is selected, or vice versa.

2. What can cause OBDII code B0423 to trigger?

Code B0423 is typically triggered by a malfunction in the right temperature control feedback circuit, which can be caused by a faulty temperature control actuator, wiring issues, or a failed HVAC control module.

3. How can I diagnose the cause of OBDII code B0423?

Diagnosing code B0423 involves using an OBDII scanner to retrieve the code, checking the right temperature control actuator for proper operation, inspecting the wiring for any damage or loose connections, and testing the HVAC control module.

4. Can I still drive my vehicle with OBDII code B0423 present?

While your vehicle may still be operable with code B0423, it is not recommended to ignore the issue, as it can lead to discomfort while driving and potentially cause further damage to the HVAC system.

5. How do I repair OBDII code B0423?

Repairing code B0423 involves replacing the faulty right temperature control actuator, repairing any damaged wiring, or replacing the HVAC control module if necessary.

6. Are there any DIY tips for fixing OBDII code B0423?

DIY tips for fixing code B0423 include ensuring all electrical connections are secure, checking for visible signs of wiring damage, and following a repair manual specific to your vehicle for detailed instructions.

7. Is OBDII code B0423 a common issue in certain vehicle makes and models?

Code B0423 can be a common issue in certain vehicle makes and models that have dual-zone climate control systems, as it directly relates to the right temperature control feedback circuit.

8. Can a faulty cabin air filter cause OBDII code B0423 to appear?

While a dirty cabin air filter can affect the HVAC system's performance, it is unlikely to directly cause code B0423. Focus on diagnosing the temperature control feedback circuit for this specific code.

9. Will resetting the OBDII codes make OBDII code B0423 disappear permanently?

Resetting the OBDII codes may temporarily clear code B0423, but if the underlying issue causing the code is not addressed, it is likely to reappear after driving cycles as the onboard diagnostics detect the problem again.

10. How much does it typically cost to repair OBDII code B0423 at a professional auto repair shop?

The cost of repairing code B0423 can vary depending on the underlying issue, the labor rates of the repair shop, and the cost of any necessary parts. It is recommended to obtain quotes from multiple shops for an accurate estimate.