AutoCodes – GMC – B393B 2015 GMC Sierra

B393B 2015 GMC Sierra 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 2015 GMC Sierra 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 491

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 2015 GMC Sierra 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 2015 GMC Sierra - Air Conditioning Compressor Valve Control Circuit - AutoCodes.com — B393B 2015 GMC Sierra Code - Air Conditioning Compressor Valve Control Circuit

What does this mean?

What are the Possible Causes of the DTC B393B 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra code?

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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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B393B in a 2015 GMC Sierra related to the Air Conditioning Compressor Valve Control Circuit?

- Common symptoms include a malfunctioning air conditioning compressor, lack of cold air from the vents, and potential issues with temperature control.

2. What could be the possible causes triggering OBDII code B393B in a 2015 GMC Sierra?

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

3. How can I diagnose the cause of OBDII code B393B in a 2015 GMC Sierra?

- Use a diagnostic scanner to retrieve the code and check for any related codes. Inspect the compressor wiring and connectors for damage, test the compressor operation, and ensure refrigerant levels are adequate.

4. Can I drive my 2015 GMC Sierra with OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit?

- It is not recommended to drive with this code as it may result in poor air conditioning performance, potential damage to the compressor, and discomfort due to lack of cooling.

5. How do I repair OBDII code B393B in a 2015 GMC Sierra?

- Repair options include fixing or replacing the compressor valve control circuit, repairing damaged wiring or connectors, refilling refrigerant, or replacing the compressor if necessary.

6. Are there any DIY tips for fixing OBDII code B393B in a 2015 GMC Sierra?

- DIY tips include checking and cleaning electrical connections, inspecting for visible damage to wiring, and ensuring the compressor is receiving power.

7. Is it safe to reset the OBDII code B393B in a 2015 GMC Sierra without fixing the underlying issue?

- It is not recommended to reset the code without addressing the root cause, as the problem may persist and lead to further issues with the air conditioning system.

8. How much does it typically cost to repair OBDII code B393B in a 2015 GMC Sierra at a professional mechanic or dealership?

- Repair costs can vary but may include diagnostic fees, parts replacement costs, and labor charges, potentially ranging from $200 to $800 depending on the required repairs.

9. Can extreme weather conditions affect the triggering of OBDII code B393B in a 2015 GMC Sierra?

- Extreme heat or cold can potentially impact the performance of the air conditioning system, leading to issues that may trigger the compressor valve control circuit code.

10. How often should I check the air conditioning system in my 2015 GMC Sierra to prevent OBDII code B393B from occurring?

- Regularly inspect the air conditioning system for any signs of issues such as unusual noises, lack of cooling, or irregular airflow to catch potential problems early and prevent the code from triggering.