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AutoCodes – Generic – B3782

B3782 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 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 20,648
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 15, 2020
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Code B3782 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 - Air Flow Control 10 Feedback Circuit Malfunction - AutoCodes.com
B3782 Code - Air Flow Control 10 Feedback Circuit Malfunction
What does this mean?

What are the Possible Causes of the DTC B3782?

  • 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?

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 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 B3782 code?

Need more information on how to fix the B3782 code? Get Access to Factory Service Manuals

Need Help with the Code?

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

Information for Specific Makes

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 Code

1. What does the OBDII code B3782 mean?

The B3782 code indicates an Air Flow Control 10 Feedback Circuit Malfunction, which typically involves an issue in the feedback circuit related to air flow control in the vehicle’s HVAC system.

2. What are the symptoms of the B3782 code?

Symptoms may include improper air distribution from the HVAC system, inability to control airflow direction, or unusual noises from the air distribution system.

3. What causes the B3782 code to appear?

Common causes include a faulty air flow control actuator, damaged wiring or connectors in the feedback circuit, or a malfunctioning HVAC control module.

4. Can a bad actuator trigger the B3782 code?

Yes, a defective air flow control actuator is one of the most common causes of the B3782 code.

5. How can I diagnose the B3782 code?

Diagnosis involves inspecting the air flow control actuator, checking for damaged or disconnected wiring, and testing the feedback circuit for proper voltage and continuity.

6. Is it safe to drive with the B3782 code?

Yes, it is generally safe to drive, but the HVAC system may not function properly, affecting passenger comfort.

7. How do I fix the B3782 code?

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

8. How much does it cost to repair the B3782 code?

Repair costs can vary but typically range from $100 to $500, depending on whether the actuator, wiring, or control module needs replacement.

9. Can I clear the B3782 code without fixing the problem?

Clearing the code without addressing the issue will likely result in the code returning, as the underlying malfunction will persist.

10. What tools are needed to troubleshoot the B3782 code?

Tools include an OBDII scanner, a multimeter for testing electrical circuits, and possibly a service manual for the specific vehicle.

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