AutoCodes – Buick – B3773 Buick

B3773 Buick Code - Air Flow Control 7 Feedback Circuit Short to Ground or Open

Quick Answer

The Auxiliary 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 Recirculation Door Actuator, Recirculation Door Actuator harness is open or shorted, Recirculation Door 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: B3773 Buick indicates Air Flow Control 7 Feedback Circuit Short to Ground or Open.
Common causes: Common causes include Faulty Recirculation Door Actuator, Recirculation Door Actuator harness is open or shorted, Recirculation Door 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 467

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 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3773 Buick Description

The Auxiliary 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 HVAC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The HVAC module controls the direction of the actuator door by changing the polarity of the control circuits.

OBDII Code B3773 Buick - Air Flow Control 7 Feedback Circuit Short to Ground or Open - AutoCodes.com — B3773 Buick Code - Air Flow Control 7 Feedback Circuit Short to Ground or Open

What does this mean?

What are the Possible Causes of the DTC B3773 Buick?

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

How to Fix the DTC B3773 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 B3773 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 B3773 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 B3773 Buick Code

1. What are the common symptoms of OBDII code B3773 in a Buick related to the Air Flow Control 7 Feedback Circuit Short to Ground or Open?

- Common symptoms include rough idling, loss of power, poor fuel economy, and the illumination of the check engine light on the dashboard.

2. What are the possible causes of OBDII code B3773 in a Buick indicating an Air Flow Control 7 Feedback Circuit Short to Ground or Open?

- Potential causes could be a faulty air flow control sensor, damaged wiring or connectors in the circuit, or a malfunctioning ECM (Engine Control Module).

3. How can I diagnose the issue related to OBDII code B3773 in my Buick?

- To diagnose the problem, you will need an OBDII scanner to retrieve the specific fault code and then perform a thorough inspection of the air flow control system, wiring, and connectors for any visible damage or loose connections.

4. What steps can I take to repair OBDII code B3773 in my Buick with regards to the Air Flow Control 7 Feedback Circuit Short to Ground or Open?

- Repairing the issue may involve replacing the air flow control sensor, repairing or replacing damaged wiring or connectors, or reprogramming the ECM if necessary.

5. Can I continue driving my Buick with OBDII code B3773 present?

- It is not recommended to continue driving your vehicle with this fault code present, as it can lead to further damage and potentially unsafe driving conditions. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code B3773 in a Buick?

- The cost of repairing this code can vary depending on the specific cause of the issue and the labor rates of the repair shop. It's advisable to get a few quotes from certified mechanics.

7. Is OBDII code B3773 a common issue in Buick vehicles?

- While this specific fault code may not be extremely common, issues related to the air flow control system can occur in Buick vehicles, especially as they age and components wear out.

8. Can a DIY enthusiast with some mechanical knowledge repair OBDII code B3773 in a Buick?

- Depending on the exact cause of the fault, a DIY enthusiast may be able to repair this issue if they have the necessary tools, equipment, and expertise. However, for complex electrical issues, it's best to consult a professional.

9. Will resetting the check engine light clear OBDII code B3773 in a Buick?

- Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing OBDII code B3773. It's essential to diagnose and repair the problem to prevent it from recurring.

10. How long does it typically take to repair OBDII code B3773 in a Buick?

- The repair time can vary depending on the exact cause of the fault, the availability of parts, and the workload of the repair shop. In some cases, it can be resolved within a few hours, while more complex issues may take longer to diagnose and repair.