AutoCodes – GMC – B1740 2015 GMC Sierra

B1740 2015 GMC Sierra Code - Driver Seat Front Down Switch Circuit

Quick Answer

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster 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: B1740 2015 GMC Sierra indicates Driver Seat Front Down Switch Circuit.
Common causes: Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster 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 195

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 Apr 23, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1740 2015 GMC Sierra Description

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. When the power seat or lumbar switches are pressed, the appropriate signal circuit from the Seat Memory Control Module is pulled low through the switch contacts indicating the power seat command. The Seat Memory Control Module then commands the driver seat or lumbar to move in response to the switch signals. The Diagnostic Trouble Code (DTC) will be set when there is a short to ground on a switch signal circuit.

OBDII Code B1740 2015 GMC Sierra - Driver Seat Front Down Switch Circuit - AutoCodes.com — B1740 2015 GMC Sierra Code - Driver Seat Front Down Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1740 2015 GMC Sierra?

Faulty Driver Seat Adjuster Switch
Driver Seat Adjuster Switch harness is open or shorted
Driver Seat Adjuster Switch circuit poor electrical connection
Faulty Seat Memory Control Module

How to Fix the DTC B1740 2015 GMC Sierra?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1740 2015 GMC Sierra 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 B1740 2015 GMC Sierra Code

1. What does the OBDII code B1740 mean on a 2015 GMC Sierra?

The code B1740 indicates a fault in the Driver Seat Front Down Switch Circuit, which controls the downward movement of the driverâ€™s seat.

2. What are the common symptoms of the B1740 code?

Symptoms may include the driverâ€™s seat not lowering properly, unresponsive seat adjustment controls, or intermittent functionality of the seat adjustment.

3. What causes the B1740 code to appear?

The code can be triggered by a faulty seat adjustment switch, damaged wiring, a poor electrical connection in the circuit, or a malfunctioning seat motor.

4. How can I diagnose the B1740 code?

Start by inspecting the seat adjustment switch and its wiring for damage. Test the circuit for continuity and check for any loose or corroded connections.

5. Can the B1740 code be caused by a blown fuse?

Yes, a blown fuse related to the seat adjustment system can potentially cause this code, so itâ€™s important to check the fuse box.

6. How do you fix the B1740 code on a 2015 GMC Sierra?

Repairs may include replacing the seat adjustment switch, repairing damaged wiring, cleaning corroded connectors, or replacing the seat motor if necessary.

7. Is it safe to drive with the B1740 code active?

Yes, it is generally safe to drive, but the driverâ€™s seat may not adjust properly, which could affect comfort and driving position.

8. How much does it cost to repair the B1740 code?

Repair costs can vary, ranging from $50 for a simple wiring repair to $300 or more if the seat motor or switch needs replacement.

9. Can I reset the B1740 code without repairing the issue?

You can clear the code with an OBDII scanner, but it will likely return if the underlying issue isnâ€™t resolved.

10. Does the B1740 code require professional repair, or can I fix it myself?

If youâ€™re comfortable with basic electrical diagnostics and repairs, you might be able to fix it yourself. Otherwise, itâ€™s best to consult a professional mechanic.