AutoCodes – GMC – B3764 GMC

B3764 GMC Code - Auxiliary HVAC Door Actuator Range/Performance

Quick Answer

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the auxiliary HVAC door actuators to regulate the airflow through the auxiliary HVAC system. 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: B3764 GMC indicates Auxiliary HVAC Door Actuator Range/Performance.
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 1,693

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 B3764 GMC Description

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the auxiliary HVAC door actuators to regulate the airflow through the auxiliary HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The module supplies a 5-volt source voltage to the potentiometer on the 5-volt reference circuit. The module supplies ground to the potentiometer through the low reference circuit. The auxiliary 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 module converts the voltage value to a count value where 1 volt is approximately equal to 51 counts.
The auxiliary HVAC control module calibrates the travel range of the auxiliary HVAC door actuators when it is initially powered by the battery positive voltage circuit. During calibration, the module commands the actuators in each direction until door travel is stopped. The module stores the minimum door positions and the maximum door positions of each actuator into memory. The total travel range is calculated by subtracting the minimum door position from the maximum door position. The door actuators can be calibrated again with a scan tool.

OBDII Code B3764 GMC - Auxiliary HVAC Door Actuator Range/Performance - AutoCodes.com — B3764 GMC Code - Auxiliary HVAC Door Actuator Range/Performance

What does this mean?

What are the Possible Causes of the DTC B3764 GMC?

Faulty Auxiliary Mode Actuator
Auxiliary Mode Actuator harness is open or shorted
Auxiliary Mode Actuator circuit poor electrical connection
Faulty Auxiliary Heating and Cooling Systems (HVAC) Control Module

How to Fix the DTC B3764 GMC?

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 B3764 GMC 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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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 B3764 GMC Code

1. What are the common symptoms of OBDII code B3764 GMC (Auxiliary HVAC Door Actuator Range/Performance)?

- Common symptoms include inconsistent heating or cooling, unusual noises coming from the HVAC system, and improper air distribution.

2. What are the possible causes of OBDII code B3764 GMC?

- The code may be triggered by a faulty auxiliary HVAC door actuator, a malfunctioning HVAC control module, or wiring issues.

3. How can I diagnose the issue related to OBDII code B3764 GMC?

- Diagnosis typically involves checking the auxiliary HVAC door actuator for proper function, testing the HVAC control module, and inspecting the wiring for any damage or loose connections.

4. Can I still drive my vehicle with OBDII code B3764 GMC present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid potential HVAC system malfunctions.

5. How can I repair OBDII code B3764 GMC on my GMC vehicle?

- Repair options may include replacing the faulty auxiliary HVAC door actuator, repairing or replacing the HVAC control module, and addressing any wiring issues as needed.

6. Are there any DIY tips for fixing OBDII code B3764 GMC?

- While some simple troubleshooting steps can be done by DIY enthusiasts, it is recommended to seek professional help for a proper diagnosis and repair of the issue.

7. Is it common for GMC vehicles to experience OBDII code B3764 related problems?

- Issues related to the auxiliary HVAC door actuator and OBDII code B3764 may occur in GMC vehicles equipped with this component, but the frequency can vary.

8. Can a faulty auxiliary HVAC door actuator impact the overall performance of my GMC vehicle?

- Yes, a malfunctioning auxiliary HVAC door actuator can affect the proper functioning of the HVAC system, leading to discomfort and potential issues with climate control.

9. How long does it typically take to repair OBDII code B3764 GMC?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and repair the problem effectively.

10. Can resetting the OBDII system clear the B3764 code temporarily?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.