AutoCodes – Buick – B3782 Buick

B3782 Buick Code - Air Flow Control 10 Feedback Circuit Malfunction

Quick Answer

The actuators operate using 5 circuits. Common causes include Faulty Auxiliary Mode Actuator, Auxiliary Mode Actuator harness is open or shorted, Auxiliary Mode Actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B3782 Buick indicates Air Flow Control 10 Feedback Circuit Malfunction.
Common causes: Common causes include Faulty Auxiliary Mode Actuator, Auxiliary Mode Actuator harness is open or shorted, Auxiliary Mode Actuator circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,271

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3782 Buick Description

The actuators operate using 5 circuits. A 5-volt reference, low reference, signal circuit and two bi-directional 0 or 12 volt control circuits. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module supplies a low reference and 5-volt reference to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. As the actuator door changes position the door position signal circuit voltage also changes. The two bi-directional control circuits enable the actuator to operate. Both circuits are set to 0 volts when the HVAC control module detects, from the feedback potentiometer, that the actuator is in the desired position. In order to move the actuator, the HVAC control module switches the appropriate control circuit to 12 volts.

OBDII Code B3782 Buick - Air Flow Control 10 Feedback Circuit Malfunction - AutoCodes.com — B3782 Buick Code - Air Flow Control 10 Feedback Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B3782 Buick?

Faulty Auxiliary Mode Actuator
Auxiliary Mode Actuator harness is open or shorted
Auxiliary Mode Actuator circuit poor electrical connection
Faulty Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B3782 Buick?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3782 Buick 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.

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Need Help with the Code?

Get the B3782 Buick code diagnosed by a professional: Find a repair shop in your area

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 B3782 Buick Code

1. What does the OBDII code B3782 mean on a Buick?

The B3782 code indicates a malfunction in the Air Flow Control 10 Feedback Circuit, which is part of the vehicle's HVAC system.

2. What are common symptoms of the B3782 code on a Buick?

Symptoms may include improper airflow from the HVAC system, inability to control air direction, and inconsistent cabin temperature.

3. What causes the B3782 code to appear on a Buick?

Common causes include a faulty air flow control actuator, wiring issues, or a malfunctioning HVAC control module.

4. Can I still drive my Buick with the B3782 code active?

Yes, the vehicle is usually drivable, but HVAC performance may be compromised, affecting cabin comfort.

5. How can I diagnose the B3782 code on my Buick?

Use an OBDII scanner to confirm the code, then inspect the airflow control actuator, wiring, and HVAC control module for damage or faults.

6. How do I fix the B3782 code on a Buick?

Repairs may include replacing the air flow control actuator, repairing damaged wiring, or reprogramming or replacing the HVAC control module.

7. How much does it cost to repair the B3782 code on a Buick?

Costs vary, but replacing the air flow control actuator typically ranges from $100 to $300, depending on labor and parts.

8. Can a faulty air flow control actuator trigger the B3782 code?

Yes, a malfunctioning actuator is one of the most common causes of this code.

9. Will clearing the B3782 code fix the issue permanently?

Clearing the code may temporarily reset the system, but the underlying issue must be resolved to prevent the code from returning.

10. Does the B3782 code affect other vehicle systems?

This code primarily affects the HVAC system and does not usually impact other vehicle systems.

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