AutoCodes – Saturn – B393B Saturn

B393B Saturn 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 Saturn 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 685
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 17, 2023
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Code B393B Saturn 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 Saturn - Air Conditioning Compressor Valve Control Circuit - AutoCodes.com
B393B Saturn Code - Air Conditioning Compressor Valve Control Circuit

What are the Possible Causes of the DTC B393B Saturn?

  • 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 Saturn?

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 Saturn 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 Saturn 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 Saturn Code

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

- Common symptoms include issues with the air conditioning system such as failure to cool properly, intermittent cooling, or the compressor not engaging.

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

- Potential causes may include a faulty compressor valve, damaged wiring or connectors in the circuit, a malfunctioning compressor clutch, or a problem with the AC control module.

3. How can I diagnose the issue causing OBDII code B393B in my Saturn's Air Conditioning Compressor Valve Control Circuit?

- Diagnosis typically involves using a diagnostic scanner to read the code, checking the wiring and connectors for damage, testing the compressor clutch, and verifying proper voltage and signals in the circuit.

4. Is it safe to continue driving my Saturn with OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit?

- It is generally not recommended to drive the vehicle with this code, as it can lead to further damage to the air conditioning system and potentially affect other components.

5. Can I reset OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit in my Saturn to see if it comes back?

- While you can clear the code temporarily, it is important to diagnose and address the underlying issue causing the fault code to prevent it from recurring.

6. What are some repair tips for fixing OBDII code B393B in a Saturn related to the Air Conditioning Compressor Valve Control Circuit?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing a faulty compressor valve, inspecting and testing the compressor clutch, and ensuring proper operation of the AC control module.

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

- Repair costs can vary depending on the specific issue, but they may range from a few hundred to a few thousand dollars, especially if components like the compressor need to be replaced.

8. Are there any preventive maintenance steps I can take to avoid OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit in my Saturn?

- Regularly servicing and inspecting the air conditioning system, checking for any unusual noises or performance issues, and addressing any problems promptly can help prevent this code from appearing.

9. Can a DIY enthusiast fix OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit in a Saturn?

- While some simpler repairs like checking and replacing fuses or relays can be done by DIY enthusiasts, diagnosing and repairing complex issues with the compressor valve control circuit may require professional expertise.

10. How long does it typically take to repair OBDII code B393B related to the Air Conditioning Compressor Valve Control Circuit in a Saturn?

- The repair time can vary depending on the specific issue and the extent of repairs needed, but it may take anywhere from a few hours to a full day to address the problem effectively.

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