Engine-Codes.com
Engine-Codes – GMC – B393B 2017 GMC Sierra

B393B 2017 GMC Sierra Code - Air Conditioning Compressor Valve Control Circuit

Quick Answer

The B393B diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Air Conditioning Compressor Valve Control Circuit. Common causes include Faulty air conditioning compressor valve, Damaged wiring or connectors in the control circuit, Malfunctioning control module. 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
B393B 2017 GMC Sierra indicates Air Conditioning Compressor Valve Control Circuit.
Common causes
Common causes include Faulty air conditioning compressor valve, Damaged wiring or connectors in the control circuit, Malfunctioning control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B393B 2017 GMC Sierra Description

The B393B diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Air Conditioning Compressor Valve Control Circuit. This code indicates a problem with the control circuit that manages the operation of the air conditioning compressor valve. The air conditioning compressor is responsible for pressurizing and circulating the refrigerant in the A/C system, which is crucial for cooling the interior of the vehicle. The valve control circuit plays a vital role in regulating the compressor's operation, ensuring that the A/C system functions correctly.

OBDII Code B393B 2017 GMC Sierra - Air Conditioning Compressor Valve Control Circuit
B393B 2017 GMC Sierra Code - Air Conditioning Compressor Valve Control Circuit

Common Causes of B393B 2017 GMC Sierra

  1. Faulty air conditioning compressor valve
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning control module
  4. Poor electrical connection in the circuit
  5. Electrical issues such as a blown fuse or relay

Symptoms of B393B 2017 GMC Sierra

  1. Lack of cold air coming from the A/C vents
  2. Inconsistent cooling performance
  3. A/C compressor not engaging or disengaging properly
  4. Unusual noises coming from the A/C system
  5. A/C system may not turn on at all

How to Fix B393B 2017 GMC Sierra

  1. Diagnose the specific cause of the issue using a scan tool to read the DTC and perform electrical testing.
  2. Inspect the air conditioning compressor valve and wiring for any visible damage or wear.
  3. Replace the faulty compressor valve, wiring, or control module as needed.
  4. Repair any damaged connectors or connections in the circuit.
  5. Clear the DTC and test the A/C system to ensure proper operation.

Cost to Fix B393B 2017 GMC Sierra

The cost of repairing the Air Conditioning Compressor Valve Control Circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $150 to $300. Overall, the total repair cost for this issue may fall between $250 and $800. However, it's important to note that these are rough estimates, and actual costs may differ based on factors such as location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate.

Need more information about the B393B 2017 GMC Sierra code?

Need more information on how to fix the B393B 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B393B 2017 GMC Sierra 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 B393B 2017 GMC Sierra Code

1. What does the OBDII code B393B mean on a 2017 GMC Sierra?

The code B393B indicates an issue with the Air Conditioning Compressor Valve Control Circuit, typically involving a malfunction in the electrical control or wiring of the A/C compressor valve.

2. What are the symptoms of code B393B on a 2017 GMC Sierra?

Common symptoms include the air conditioning not cooling properly, the A/C system not engaging, or intermittent cooling performance.

3. What causes code B393B to appear in a 2017 GMC Sierra?

Possible causes include a faulty A/C compressor control valve, damaged wiring or connectors in the control circuit, or a malfunctioning A/C control module.

4. How do you diagnose code B393B on a 2017 GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, testing the A/C compressor control valve for proper operation, and checking for any A/C system-related module faults.

5. Can a blown fuse cause the B393B code on a 2017 GMC Sierra?

Yes, a blown fuse in the A/C system circuit can disrupt power to the compressor valve, triggering the code.

6. How serious is the B393B code on a 2017 GMC Sierra?

While not an immediate safety concern, it can prevent the A/C system from functioning properly, reducing comfort during hot weather.

7. Can I drive my 2017 GMC Sierra with the B393B code active?

Yes, but the A/C system may not work as intended, which could be uncomfortable in extreme temperatures.

8. How do you fix code B393B on a 2017 GMC Sierra?

Repairs may include replacing the A/C compressor control valve, repairing or replacing damaged wiring or connectors, or reprogramming the A/C control module if necessary.

9. How much does it cost to repair the B393B code on a 2017 GMC Sierra?

Repair costs can vary depending on the issue but may range from $150 to $500 or more, depending on whether the compressor valve or wiring needs replacement.

10. Can low refrigerant levels cause the B393B code on a 2017 GMC Sierra?

Low refrigerant levels generally don’t trigger this specific code but can cause A/C performance issues. It's important to check refrigerant levels during diagnosis.

Discuss the causes and fixes for B393B 2017 GMC Sierra OBDII Code

Submit a New Comment

Code B393B 2017 GMC Sierra comments

No comments found for this page.