B154A 2015 GMC Sierra 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 2015 GMC Sierra 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.
Code B154A 2015 GMC Sierra Description
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.
What are the Possible Causes of the DTC B154A 2015 GMC Sierra?
- 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 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B154A 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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Frequently Asked Questions about B154A 2015 GMC Sierra Code
1. What does the OBDII code B154A mean on a 2015 GMC Sierra?
The B154A code indicates a "Driver Mirror Internal Malfunction," which means there is an issue with the internal circuitry or motor components of the driver-side mirror.
2. What are the common symptoms of the B154A code on a 2015 GMC Sierra?
Symptoms may include the driver-side mirror not adjusting properly, intermittent functionality, unresponsive mirror controls, or strange noises coming from the mirror assembly.
3. What causes the B154A code to appear on a 2015 GMC Sierra?
Common causes include a faulty mirror motor, damaged wiring or connectors in the mirror assembly, or a malfunctioning mirror control module.
4. Can I still drive my 2015 GMC Sierra with the B154A code?
Yes, you can still drive the vehicle, but the driver-side mirror may not function properly, which could impact visibility and safety.
5. How do I troubleshoot the B154A code on my 2015 GMC Sierra?
Start by checking the mirror wiring and connectors for damage or corrosion, inspect the mirror motor for proper operation, and test the mirror control switches.
6. Do I need to replace the entire mirror assembly to fix the B154A code?
Not always. Depending on the issue, you might only need to replace the mirror motor or repair damaged wiring instead of replacing the entire assembly.
7. Can a software issue cause the B154A code on a 2015 GMC Sierra?
While rare, a software glitch in the body control module (BCM) or mirror control module could potentially trigger the code. A module reset or reprogramming may resolve it.
8. How much does it cost to fix the B154A code on a 2015 GMC Sierra?
Repair costs vary but can range from $100 to $500, depending on whether you need to replace individual components or the entire mirror assembly.
9. Can I fix the B154A code on my 2015 GMC Sierra myself?
If you’re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it by inspecting the wiring, connectors, and mirror motor. Otherwise, it’s best to consult a professional.
10. Will clearing the B154A code solve the issue on my 2015 GMC Sierra?
Clearing the code might temporarily reset the system, but if the underlying problem isn’t addressed, the code will likely return.
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