AutoCodes – Pontiac – B393B Pontiac

B393B Pontiac 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 Pontiac 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 646

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

What does this mean?

What are the Possible Causes of the DTC B393B Pontiac?

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 Pontiac?

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 Pontiac 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.

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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 Pontiac Code

1. What are the common symptoms of OBDII code B393B Pontiac related to the Air Conditioning Compressor Valve Control Circuit?

- Common symptoms include poor or no air conditioning performance, the AC compressor not engaging, and a flashing AC light on the dashboard.

2. What are the possible causes of OBDII code B393B Pontiac indicating an issue with the Air Conditioning Compressor Valve Control Circuit?

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

3. How can I diagnose the OBDII code B393B Pontiac related to the Air Conditioning Compressor Valve Control Circuit?

- Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the AC compressor control valve and related components, and testing the circuit for continuity and proper voltage.

4. Is it safe to continue driving my Pontiac with OBDII code B393B indicating an Air Conditioning Compressor Valve Control Circuit issue?

- While it may be safe to drive, it is not recommended as prolonged use can lead to further damage to the AC system. It is best to address the issue promptly to avoid potential costly repairs.

5. How can I repair OBDII code B393B Pontiac associated with the Air Conditioning Compressor Valve Control Circuit?

- Repair options may include replacing the faulty AC compressor control valve, repairing damaged wiring or connectors, recharging the refrigerant, or resetting the fault code after fixing the issue.

6. Can low refrigerant levels cause OBDII code B393B Pontiac to trigger in relation to the Air Conditioning Compressor Valve Control Circuit?

- Yes, low refrigerant levels can affect the proper operation of the AC compressor control valve, leading to the triggering of the B393B fault code.

7. Are there any preventive maintenance tips to avoid encountering OBDII code B393B Pontiac for the Air Conditioning Compressor Valve Control Circuit?

- Regularly checking and maintaining proper refrigerant levels, inspecting the AC system for leaks, and addressing any AC-related issues promptly can help prevent the occurrence of this fault code.

8. Can a DIY enthusiast without advanced automotive knowledge repair OBDII code B393B Pontiac linked to the Air Conditioning Compressor Valve Control Circuit?

- While some basic repairs like checking connectors or replacing fuses can be done by DIY enthusiasts, diagnosing and repairing complex issues related to this fault code may require professional assistance.

9. Will resetting the fault code associated with OBDII code B393B Pontiac for the Air Conditioning Compressor Valve Control Circuit solve the underlying issue?

- Resetting the fault code may temporarily clear the warning light, but it will not fix the root cause of the problem. It is essential to diagnose and repair the issue to prevent future occurrences.

10. What role does the AC compressor control valve play in the overall operation of the air conditioning system in a Pontiac?

- The AC compressor control valve regulates the flow of refrigerant in the AC system, controlling the compressor's engagement and ensuring efficient cooling inside the vehicle.