B154B 2015 GMC Sierra Code - Passenger 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 Passenger Outside Rearview Mirror Motor, Passenger Outside Rearview Mirror Motor harness is open or shorted, Passenger 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
- B154B 2015 GMC Sierra indicates Passenger Mirror Internal Malfunction.
- Common causes
- Common causes include Faulty Passenger Outside Rearview Mirror Motor, Passenger Outside Rearview Mirror Motor harness is open or shorted, Passenger 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 B154B 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 passenger window switch while commanding the passenger outside rearview mirror UP, DOWN, LEFT, or RIGHT.
What are the Possible Causes of the DTC B154B 2015 GMC Sierra?
- Faulty Passenger Outside Rearview Mirror Motor
- Passenger Outside Rearview Mirror Motor harness is open or shorted
- Passenger Outside Rearview Mirror Motor circuit poor electrical connection
How to Fix the DTC B154B 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 B154B 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 B154B 2015 GMC Sierra Code
1. What does OBDII code B154B mean on a 2015 GMC Sierra?
Code B154B indicates a "Passenger Mirror Internal Malfunction," suggesting an issue with the internal components or circuitry of the passenger-side mirror.
2. What are the common symptoms of code B154B in a 2015 GMC Sierra?
Symptoms may include the passenger-side mirror not responding to adjustment commands, failure of heating or dimming functions, or intermittent operation.
3. What causes code B154B to appear on a 2015 GMC Sierra?
Common causes include faulty mirror electronics, damaged wiring or connectors, or issues with the body control module (BCM).
4. Can a damaged mirror assembly trigger code B154B?
Yes, physical damage to the passenger mirror assembly, such as impact or water intrusion, can cause internal malfunctions and trigger this code.
5. How can I troubleshoot code B154B on my 2015 GMC Sierra?
Start by visually inspecting the passenger mirror for damage, check wiring and connectors for corrosion or breaks, and test the mirror functionality using a scan tool.
6. Is replacing the passenger mirror necessary to fix code B154B?
In many cases, replacing the passenger mirror assembly resolves the issue, but verify the problem through diagnostics to ensure the mirror is the root cause.
7. Can a faulty body control module (BCM) cause code B154B?
Yes, although rare, a malfunctioning BCM may fail to communicate properly with the mirror, leading to this code.
8. How much does it typically cost to repair code B154B on a 2015 GMC Sierra?
The cost varies depending on whether the mirror assembly needs replacement, with prices ranging from $200 to $500 for parts and labor.
9. Can I clear code B154B without fixing the underlying issue?
You can clear the code temporarily, but it will likely return unless the root cause is addressed.
10. Is code B154B a safety concern for my 2015 GMC Sierra?
While it doesn't directly impact vehicle safety, a malfunctioning mirror can reduce visibility and compromise safe driving. Repairing it promptly is recommended.
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