AutoCodes – GMC – B154A GMC

B154A GMC Code - Driver Mirror Internal Malfunction

Quick Answer

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. Common causes include Faulty Driver Outside Rearview Mirror Motor, Driver Outside Rearview Mirror Motor harness is open or shorted, Driver Outside Rearview Mirror Motor 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: B154A GMC indicates Driver Mirror Internal Malfunction.
Common causes: Common causes include Faulty Driver Outside Rearview Mirror Motor, Driver Outside Rearview Mirror Motor harness is open or shorted, Driver Outside Rearview Mirror Motor 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 335

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 Apr 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B154A GMC Description

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rearview mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.
The Diagnostic Trouble Code (DTC) will be set when an internal malfunction has been detected by the outside rearview mirror switch while commanding the driver outside rearview mirror UP, DOWN, LEFT, or RIGHT.

OBDII Code B154A GMC - Driver Mirror Internal Malfunction - AutoCodes.com — B154A GMC Code - Driver Mirror Internal Malfunction

What does this mean?

What are the Possible Causes of the DTC B154A GMC?

Faulty Driver Outside Rearview Mirror Motor
Driver Outside Rearview Mirror Motor harness is open or shorted
Driver Outside Rearview Mirror Motor circuit poor electrical connection

How to Fix the DTC B154A 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 B154A 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 B154A GMC code?

Need more information on how to fix the B154A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B154A GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B154A 2014 GMC Sierra — Driver Mirror Internal Malfunction
B154A 2015 GMC Sierra — Driver Mirror Internal Malfunction
B154A 2016 GMC Sierra — Driver Mirror Internal Malfunction
B154A 2017 GMC Sierra — Driver Mirror Internal Malfunction
B154A 2018 GMC Sierra — Driver Mirror Internal 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 B154A GMC Code

1. What are common symptoms of OBDII code B154A GMC (Driver Mirror Internal Malfunction)?

The common symptoms include erratic or non-functional movement of the driver side mirror, inoperative mirror controls, and warning lights on the dashboard.

2. What are the potential causes of OBDII code B154A GMC?

The code B154A GMC is typically triggered by internal malfunctions within the driver side mirror module, such as wiring issues, damaged components, or electronic failures.

3. How can I diagnose OBDII code B154A GMC?

A thorough visual inspection of the driver side mirror wiring and components is recommended. Using a diagnostic scanner to read and interpret the specific error codes can also help pinpoint the issue.

4. Can I still drive my vehicle with OBDII code B154A GMC?

While it is possible to continue driving the vehicle with this code, it is not advisable due to the safety implications of having a malfunctioning driver side mirror.

5. What are the repair options for OBDII code B154A GMC?

Repair options may include fixing or replacing damaged wiring, repairing or replacing the mirror module, or reprogramming the mirror control system to resolve the internal malfunction.

6. Is it possible to reset OBDII code B154A GMC without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the error code, but it is likely to reappear until the root cause of the driver mirror internal malfunction is resolved.

7. Can extreme weather conditions cause OBDII code B154A GMC to trigger?

Yes, extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially damage the driver side mirror components and lead to the internal malfunction triggering the code.

8. How much does it cost to repair OBDII code B154A GMC?

The cost of repair can vary depending on the extent of the damage and the specific parts or components that need to be fixed or replaced. It is recommended to consult a professional mechanic for an accurate cost estimate.

9. Are there any preventive measures to avoid OBDII code B154A GMC from occurring?

Regular inspection and maintenance of the driver side mirror, keeping it clean and free of debris, and addressing any issues promptly can help prevent the internal malfunction that triggers the code.

10. Can OBDII code B154A GMC affect other vehicle systems?

While the code specifically relates to the driver side mirror internal malfunction, it is always advisable to address any error codes promptly to prevent potential issues from affecting other vehicle systems.