AutoCodes – Generic – B0363

B0363 Code - Left Actuator Feedback Open

Quick Answer

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module commands the air temperature actuators to move by controlling the voltage supplied on the control circuit. Common causes include Faulty Left Actuator, Left Actuator harness is open or shorted, Left Actuator circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0363 indicates Left Actuator Feedback Open.
Common causes: Common causes include Faulty Left Actuator, Left Actuator harness is open or shorted, Left Actuator circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,558

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0363 Description

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module commands the air temperature actuators to move by controlling the voltage supplied on the control circuit. A signal voltage of 0 volts or a signal voltage of 5 volts rotates the air temperature actuator. A voltage of 2.5 volts stops the door. The HVAC control module determines the current position of the actuator by monitoring the voltage on the signal circuit. The feedback potentiometer is a function of the motor position. The HVAC control module controls the air temperature actuator door positions in order to maintain the selected air temperature.

OBDII Code B0363 - Left Actuator Feedback Open - AutoCodes.com — B0363 Code - Left Actuator Feedback Open

What does this mean?

What are the Possible Causes of the DTC B0363?

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

How to Fix the DTC B0363?

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 B0363 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 B0363 code?

Need more information on how to fix the B0363 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0363 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0363 Buick — Left Actuator Feedback Open
B0363 Cadillac — Left Actuator Feedback Open
B0363 Chevrolet — Left Actuator Feedback Open
B0363 GMC — Left Actuator Feedback Open

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 B0363 Code

1. What does the OBDII code B0363 mean?

B0363 indicates an open circuit in the left actuator feedback system, typically related to the HVAC blend door or mode door actuator.

2. What are the common symptoms of the B0363 code?

Symptoms may include improper or inconsistent HVAC airflow, inability to control cabin temperature, and possible clicking noises from the HVAC system.

3. What causes the B0363 code to appear?

The code is usually caused by a faulty left actuator, damaged or corroded wiring, loose electrical connections, or a malfunctioning HVAC control module.

4. How can I diagnose the B0363 code?

Start by visually inspecting the actuator and its wiring for damage or loose connections. Use a multimeter to check for continuity in the circuit and confirm actuator functionality.

5. Can I drive with the B0363 code active?

Yes, but the HVAC system may not function properly, which could lead to discomfort or reduced defogging capability in certain weather conditions.

6. How do I fix the B0363 code?

Repairs may include replacing the left HVAC actuator, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the HVAC control module.

7. How much does it cost to repair the B0363 code?

The cost varies depending on the issue. Replacing an actuator typically costs $150â€“$300, while fixing wiring or connections may cost less if no major components need replacing.

8. Can I reset the B0363 code without fixing the problem?

Clearing the code without addressing the root cause will only temporarily remove it. The code will reappear if the issue persists.

9. Is the left actuator the same as the blend door actuator?

The left actuator often refers to the blend door actuator on the driverâ€™s side, but it may also involve other actuators depending on the vehicle's HVAC system design.

10. Do I need special tools to repair the B0363 code?

You may need a multimeter to test wiring, a scan tool to clear the code and verify repairs, and basic hand tools to access and replace the actuator.