AutoCodes – Generic – B3593

B3593 Code - Steering System Mode Switch Circuit Malfunction

Quick Answer

The Rear Wheel Steering Control Module monitors the rear wheel steering mode select switch 5-volt reference circuit for out of range voltage conditions. Common causes include Faulty Steering System Mode Switch, Steering System Mode Switch harness is open or shorted, Steering System Mode Switch 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: B3593 indicates Steering System Mode Switch Circuit Malfunction.
Common causes: Common causes include Faulty Steering System Mode Switch, Steering System Mode Switch harness is open or shorted, Steering System Mode Switch 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 551

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 Mar 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3593 Description

The Rear Wheel Steering Control Module monitors the rear wheel steering mode select switch 5-volt reference circuit for out of range voltage conditions. When the mode select switch button is depressed the switch is in the active state. When the mode select switch is released the switch is in the inactive state. The Diagnostic Trouble Code (DTC) sets when the mode select switch 5-volt reference circuit is open, shorted to ground or voltage.

OBDII Code B3593 - Steering System Mode Switch Circuit Malfunction - AutoCodes.com — B3593 Code - Steering System Mode Switch Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B3593?

Faulty Steering System Mode Switch
Steering System Mode Switch harness is open or shorted
Steering System Mode Switch circuit poor electrical connection
Faulty Rear Wheel Steering Control Module

How to Fix the DTC B3593?

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 B3593 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 B3593 code?

Need more information on how to fix the B3593 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3593 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3593 Buick — Steering System Mode Switch Circuit Malfunction
B3593 Cadillac — Steering System Mode Switch Circuit Malfunction
B3593 Chevrolet — Steering System Mode Switch Circuit Malfunction
B3593 GMC — Steering System Mode Switch Circuit Malfunction

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 B3593 Code

1. What are the common symptoms of OBDII code B3593 (Steering System Mode Switch Circuit Malfunction)?

Common symptoms include the steering mode switch not responding, the steering mode indicator light staying on, or issues with changing steering modes.

2. What are the possible causes of OBDII code B3593?

Possible causes include a faulty steering mode switch, damaged wiring or connectors in the steering system circuit, or a malfunctioning steering control module.

3. How can I diagnose OBDII code B3593?

Diagnosis involves checking the steering mode switch for proper functionality, inspecting the wiring and connectors for any damage, and using a scan tool to read the trouble code and determine the exact issue.

4. Can I continue driving my vehicle with OBDII code B3593?

It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the steering system and compromise safety.

5. How can I repair OBDII code B3593?

Repair methods may include replacing the steering mode switch, repairing or replacing damaged wiring or connectors, or reprogramming the steering control module.

6. Is it possible to reset OBDII code B3593 without fixing the underlying issue?

While clearing the trouble code may temporarily turn off the warning light, the issue will likely reoccur if the root cause is not addressed.

7. Can extreme weather conditions cause OBDII code B3593 to trigger?

Yes, extreme temperatures or moisture exposure can sometimes lead to electrical issues in the steering system, potentially triggering this malfunction code.

8. Are there any preventive maintenance tips to avoid OBDII code B3593?

Regularly checking the steering mode switch, keeping the wiring connections clean and secure, and addressing any steering system issues promptly can help prevent this code from appearing.

9. Is OBDII code B3593 a common issue in certain vehicle makes or models?

This code can affect various vehicle makes and models equipped with steering mode switches and electronic steering systems.

10. How much does it typically cost to repair OBDII code B3593?

The repair costs for this code can vary depending on the specific cause of the malfunction, but it may range from a few hundred to a thousand dollars, including parts and labor.