AutoCodes – Buick – B3593 Buick

B3593 Buick 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 Buick 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 477

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

What does this mean?

What are the Possible Causes of the DTC B3593 Buick?

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 Buick?

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 Buick 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 Buick code?

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

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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 B3593 Buick Code

1. What does the OBDII code B3593 mean for a Buick?

Code B3593 indicates a malfunction in the Steering System Mode Switch Circuit, which may affect the functionality of adjustable steering modes.

2. What are common symptoms of code B3593 in a Buick?

Symptoms may include the inability to change steering modes, a warning light on the dashboard, or reduced responsiveness in the steering system.

3. What causes the B3593 code in a Buick?

Typical causes include a faulty steering mode switch, damaged wiring or connectors in the circuit, or issues with the steering control module.

4. Can I still drive my Buick with code B3593?

Yes, but the steering system may not perform optimally or allow mode adjustments, which could affect handling in certain situations.

5. How do I diagnose the B3593 code in my Buick?

Diagnosis involves checking the steering mode switch for proper function, inspecting wiring and connectors for damage, and testing the steering control module.

6. How do I fix code B3593 in a Buick?

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

7. Does code B3593 require professional repair?

While some issues like checking connectors can be done by an owner, diagnosing and repairing control module faults typically requires professional equipment and expertise.

8. Can a dead battery cause the B3593 code to appear in a Buick?

Yes, a weak or dead battery can sometimes cause intermittent electrical issues, including steering system faults, but the code will persist if thereâ€™s an underlying circuit problem.

9. Will clearing the B3593 code fix the issue?

Clearing the code may temporarily remove it, but it will return if the underlying malfunction in the steering mode switch circuit is not addressed.

10. How much does it cost to repair code B3593 in a Buick?

Repair costs vary depending on the cause, ranging from $50-$150 for minor wiring repairs to $300-$800 for parts replacement, such as the steering control module.