AutoCodes – Chevrolet – B393B Chevrolet

B393B Chevrolet 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 Chevrolet 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 14,082

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

What does this mean?

What are the Possible Causes of the DTC B393B Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the B393B Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B393B 2014 Chevrolet Silverado — Air Conditioning Compressor Valve Control Circuit
B393B 2015 Chevrolet Silverado — Air Conditioning Compressor Valve Control Circuit
B393B 2016 Chevrolet Silverado — Air Conditioning Compressor Valve Control Circuit
B393B 2017 Chevrolet Silverado — Air Conditioning Compressor Valve Control Circuit
B393B 2018 Chevrolet Silverado — Air Conditioning Compressor Valve Control Circuit

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 Chevrolet Code

1. What are the common symptoms of OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

The common symptoms include the air conditioning not working properly, warm air blowing from the vents, and the AC compressor not engaging.

2. What are the possible causes of OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

Possible causes include a faulty compressor control valve, wiring issues, a defective compressor, low refrigerant levels, or a malfunctioning AC pressure sensor.

3. How can I diagnose the OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

Diagnosis involves using an OBDII scanner to read the code, checking the wiring and connections related to the compressor control valve, testing the AC pressure sensor, and inspecting the compressor for any visible damage.

4. What are some repair tips for fixing OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

Repair tips include checking and repairing any damaged wiring, replacing the compressor control valve if faulty, testing and possibly replacing the AC pressure sensor, and ensuring the refrigerant levels are correct.

5. Can I drive my Chevrolet with OBDII code B393B related to the air conditioning compressor valve control circuit?

It is not recommended to drive the vehicle with this code as it may lead to further damage to the air conditioning system. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

The cost of repair can vary depending on the specific issue causing the code. It may range from a few hundred to over a thousand dollars, including parts and labor.

7. Is it possible to reset the OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit without fixing the underlying issue?

Resetting the code without fixing the underlying issue will only temporarily clear the error code. The problem will persist, and the code is likely to reappear once the system detects the fault again.

8. Can a DIY enthusiast fix OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

While some aspects of diagnosis and repair may be within reach of a knowledgeable DIY enthusiast, dealing with the complexities of the air conditioning system and electrical components may require professional expertise.

9. How long does it typically take to repair OBDII code B393B in a Chevrolet related to the air conditioning compressor valve control circuit?

The repair time can vary depending on the exact cause of the issue and the expertise of the technician. It may take a few hours to a full day to diagnose and fix the problem.

10. Are there any preventive measures to avoid encountering OBDII code B393B related to the air conditioning compressor valve control circuit in a Chevrolet?

Regular maintenance of the vehicle's air conditioning system, such as checking refrigerant levels, inspecting wiring for damage, and addressing any AC performance issues promptly, can help prevent the occurrence of this OBDII code.