AutoCodes – Chevrolet – B393B 2014 Chevrolet Silverado

B393B 2014 Chevrolet Silverado Code - Air Conditioning Compressor Valve Control Circuit

Quick Answer

This A/C system uses a conventional clutch to engage and mechanically turn the compressor and a variable displacement solenoid valve to alter the amount of displacement created by the turning of the compressor. Common causes include Faulty Air Conditioning Compressor, Air Conditioning Compressor harness is open or shorted, Air Conditioning Compressor 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: B393B 2014 Chevrolet Silverado indicates Air Conditioning Compressor Valve Control Circuit.
Common causes: Common causes include Faulty Air Conditioning Compressor, Air Conditioning Compressor harness is open or shorted, Air Conditioning Compressor 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 1,054

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 Jun 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B393B 2014 Chevrolet Silverado Description

This A/C system uses a conventional clutch to engage and mechanically turn the compressor and a variable displacement solenoid valve to alter the amount of displacement created by the turning of the compressor. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module provides both switched battery voltage and a pulse width modulated ground to the variable displacement solenoid valve. When the A/C switch is pressed, the HVAC Control Module grounds the variable displacement solenoid using a Pulse Width Modulation (PWM) signal in order to determine the amount of compressor displacement. The performance of the A/C compressor is based on adjusted interior temperature and engine load. The Diagnostic Trouble Code (DTC) sets when a PWM greater than 10% is sent but no current is read back.

OBDII Code B393B 2014 Chevrolet Silverado - Air Conditioning Compressor Valve Control Circuit - AutoCodes.com — B393B 2014 Chevrolet Silverado Code - Air Conditioning Compressor Valve Control Circuit

What does this mean?

What are the Possible Causes of the DTC B393B 2014 Chevrolet Silverado?

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

How to Fix the DTC B393B 2014 Chevrolet Silverado?

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 B393B 2014 Chevrolet Silverado 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 B393B 2014 Chevrolet Silverado code?

Need more information on how to fix the B393B 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B393B 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado Code

1. What are common symptoms of OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

The common symptoms include a malfunctioning air conditioning system, lack of cool air, and unusual noises coming from the compressor.

2. What are the possible causes of OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

Possible causes include a faulty compressor valve control circuit, damaged wiring or connectors, low refrigerant levels, or a defective compressor.

3. How can I diagnose OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

Diagnosing this code involves using a scan tool to retrieve the code, inspecting the compressor valve control circuit and related components, and conducting continuity and voltage tests.

4. Can a DIY enthusiast repair OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

While some basic troubleshooting steps can be performed by a DIY enthusiast, repairing this code may require specialized tools and expertise, so it's recommended to consult a professional mechanic.

5. What are some repair tips for resolving OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

Repair tips include checking and repairing damaged wiring or connectors, ensuring proper refrigerant levels, testing and replacing the compressor if necessary, and clearing the code after repairs.

6. Is it safe to continue driving a 2014 Chevrolet Silverado with OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit?

It is not recommended to drive the vehicle with this code unresolved, as it can lead to further damage to the air conditioning system and potentially cause overheating issues in extreme cases.

7. How much does it typically cost to repair OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

The cost of repairs can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor costs, and diagnostic fees, which can range from a few hundred to over a thousand dollars.

8. Are there any recalls or technical service bulletins related to OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

It's recommended to check with Chevrolet dealerships or online databases for any recalls or technical service bulletins specific to this OBDII code in the 2014 Silverado to stay informed about potential known issues and solutions.

9. How can regular maintenance help prevent OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

Regular maintenance, including checking the air conditioning system for leaks, ensuring proper refrigerant levels, and addressing any unusual noises promptly, can help prevent issues that may trigger this OBDII code.

10. Can weather conditions or environmental factors contribute to triggering OBDII code B393B in a 2014 Chevrolet Silverado related to the Air Conditioning Compressor Valve Control Circuit?

Extreme weather conditions, such as high temperatures or humidity levels, can potentially strain the air conditioning system and lead to issues that trigger this code, emphasizing the importance of proper maintenance and care.