AutoCodes – GMC – B2109 GMC

B2109 GMC Code - Power Seat Switch Shorted

Quick Answer

When the Power Seat Switches are pressed, the Memory Seat Module (MSM) receives an input from the switch. Common causes include Faulty Power Seat Adjuster Switch, Power Seat Adjuster Switch harness is open or shorted, Power 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: B2109 GMC indicates Power Seat Switch Shorted.
Common causes: Common causes include Faulty Power Seat Adjuster Switch, Power Seat Adjuster Switch harness is open or shorted, Power 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 623

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 Sep 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2109 GMC Description

When the Power Seat Switches are pressed, the Memory Seat Module (MSM) receives an input from the switch. The MSM commands the driver seat to move in response to the switch input. If a seat switch continues to be active for 30 seconds after the motor controlled by that switch reaches the end of its travel, the switch will be considered shorted and the MSM will set the Diagnostic Trouble Code (DTC) or if a position sensor DTC is current and the associated switch is active for 30 continuous seconds, the switch will be considered shorted and the MSM will set the DTC.

OBDII Code B2109 GMC - Power Seat Switch Shorted - AutoCodes.com — B2109 GMC Code - Power Seat Switch Shorted

What does this mean?

What are the Possible Causes of the DTC B2109 GMC?

Faulty Power Seat Adjuster Switch
Power Seat Adjuster Switch harness is open or shorted
Power Seat Adjuster Switch circuit poor electrical connection
Faulty Memory Seat Module (MSM)

How to Fix the DTC B2109 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 B2109 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.

Need more information about the B2109 GMC code?

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Need Help with the 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 B2109 GMC Code

1. What are the common symptoms of OBDII code B2109 GMC (Power Seat Switch Shorted)?

- The common symptoms include non-functioning power seat controls, inability to adjust the seat position, and potential illumination of the airbag warning light.

2. What are the possible causes of the OBDII code B2109 GMC (Power Seat Switch Shorted)?

- The code can be triggered by a short circuit in the power seat switch wiring, a malfunctioning power seat switch, or issues with the seat control module.

3. How can I diagnose the OBDII code B2109 GMC (Power Seat Switch Shorted)?

- Diagnosing the issue involves checking the power seat switch wiring for shorts, testing the power seat switch for proper functionality, and scanning the seat control module for fault codes.

4. Can a DIY enthusiast repair the OBDII code B2109 GMC (Power Seat Switch Shorted)?

- DIY repairs are possible if you have the necessary tools and expertise. However, it's recommended to consult a professional mechanic for accurate diagnosis and repairs.

5. Is it safe to drive with the OBDII code B2109 GMC (Power Seat Switch Shorted) active?

- It is generally safe to drive with this code, but you may experience inconvenience due to the non-functioning power seat controls. Addressing the issue promptly is recommended.

6. How much does it typically cost to repair the OBDII code B2109 GMC (Power Seat Switch Shorted)?

- The repair costs can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor charges, and diagnostic fees.

7. Can resetting the OBDII code B2109 GMC (Power Seat Switch Shorted) resolve the issue?

- Resetting the code may temporarily clear the fault, but if the underlying issue such as a short circuit or faulty switch is not addressed, the code is likely to reappear.

8. Are there any preventive measures to avoid the OBDII code B2109 GMC (Power Seat Switch Shorted)?

- Regularly inspecting the power seat controls, avoiding spills or moisture near the switches, and addressing any electrical issues promptly can help prevent this code from occurring.

9. What are the implications of ignoring the OBDII code B2109 GMC (Power Seat Switch Shorted)?

- Ignoring the code may lead to continued inconvenience of non-adjustable power seats and potential further damage to the seat control system, which could result in costlier repairs.

10. Can a faulty power seat switch cause safety concerns beyond the inconvenience?

- While a faulty power seat switch typically does not pose immediate safety risks, it can become a concern in emergency situations where quick adjustment of the seat position is necessary for driver comfort and control.