Engine-Codes - Buick - B0423 Buick

B0423 Buick Code - Right Temperature Control Feedback Circuit

- Code Popularity: 4,462 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents

What are the Possible Causes of the Code B0423 Buick?

  • 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 B0423 Buick Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Code B0423 Buick 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 B0423 Buick?

Labor: 1.0

The cost to diagnose the B0423 Buick code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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What are Code B0423 Buick Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the B0423 Buick Code Mean?

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.

B0423 Buick Code - Right Temperature Control Feedback Circuit

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