AutoCodes – GMC – B2593 GMC

B2593 GMC Code - Column Lock/Unlock Drive 'B'

Quick Answer

The Body Control Module (BCM) provides the steering column control function which allows the column to be electronically locked or unlocked. Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) 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: B2593 GMC indicates Column Lock/Unlock Drive 'B'.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) 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 567

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2593 GMC Description

The Body Control Module (BCM) provides the steering column control function which allows the column to be electronically locked or unlocked. The BCM provides three outputs, steering column lock, steering column unlock, and a steering column lock relay control. The BCM can apply a ground or battery output on the steering column lock or steering column unlock depending on the desired steering column lock motor position. The BCM uses the feedback switch in order to monitor the motor position and determine if the commanded position was accomplished. The Diagnostic Trouble Code (DTC) sets when the BCM detects an internal malfunction, an open or a short to ground, in the steering column lock circuit.

OBDII Code B2593 GMC - Column Lock/Unlock Drive 'B' - AutoCodes.com — B2593 GMC Code - Column Lock/Unlock Drive 'B'

What does this mean?

What are the Possible Causes of the DTC B2593 GMC?

Faulty Body Control Module (BCM)
Body Control Module (BCM) harness is open or shorted
Body Control Module (BCM) circuit poor electrical connection

How to Fix the DTC B2593 GMC?

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 B2593 GMC 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 B2593 GMC Code

1. What does the OBDII code B2593 mean on a GMC vehicle?

The B2593 code indicates an issue with the Column Lock/Unlock Drive 'B,' often referring to a fault in the steering column lock mechanism or its related circuitry.

2. What are the common symptoms of code B2593 in a GMC?

Symptoms may include a steering column that won't lock or unlock, a "Service Steering Column Lock" message on the dashboard, or difficulty starting the vehicle.

3. What causes the B2593 code to appear in a GMC?

Common causes include a faulty steering column lock actuator, wiring issues, poor electrical connections, or a malfunctioning Body Control Module (BCM).

4. Can a dead battery trigger the B2593 code?

Yes, a weak or dead battery can cause communication issues between the BCM and the steering column lock actuator, potentially triggering this code.

5. How is the B2593 code diagnosed in a GMC vehicle?

A technician will use a scan tool to retrieve the code, inspect the steering column lock system for physical damage, check wiring and connections, and test the actuator and BCM.

6. Can I drive my GMC with the B2593 code present?

Driving may still be possible, but it is risky as the steering column lock could fail to engage or disengage properly, potentially causing safety concerns.

7. What repairs are typically needed to fix code B2593?

Repairs may include replacing the steering column lock actuator, repairing damaged wiring, cleaning or securing electrical connections, or reprogramming the BCM.

8. How much does it cost to fix the B2593 code on a GMC?

Repair costs can vary widely but may range from $150 to $500, depending on the cause and whether parts like the actuator or wiring need replacement.

9. Can I reset the B2593 code without repairs?

While clearing the code with a scan tool may temporarily remove it, the issue will likely return if the underlying problem is not addressed.

10. Is the B2593 code covered under warranty for GMC vehicles?

It depends on your vehicle's warranty coverage and mileage, but steering column lock issues may be covered under a powertrain or bumper-to-bumper warranty. Check with your dealership for details.