B154B 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code
1. What does the OBDII code B154B mean on a 2016 GMC Sierra?
The code B154B indicates a "Passenger Mirror Internal Malfunction," meaning there is an issue with the internal components or circuits of the passenger-side mirror.
2. What are the symptoms of the B154B code on a 2016 GMC Sierra?
Common symptoms include the passenger-side mirror not adjusting, folding, or heating properly, or the mirror being completely unresponsive.
3. What causes the B154B code to appear?
This code is typically caused by a faulty mirror motor, damaged wiring or connectors, a failed mirror control module, or internal circuit issues within the mirror assembly.
4. Can a blown fuse cause the B154B code?
A blown fuse related to the mirror system could contribute to the issue, but the code specifically points to an internal malfunction in the mirror itself.
5. How is the B154B code diagnosed?
A technician will inspect the mirror wiring, connectors, and control module for damage, test the mirror motor's functionality, and use a scan tool to confirm the fault.
6. Can I still drive my 2016 GMC Sierra with the B154B code?
Yes, the vehicle is still drivable, but the passenger mirror may not function properly, which could impact visibility and safety.
7. How do I fix the B154B code on my GMC Sierra?
Repairs may include replacing the passenger-side mirror assembly, repairing damaged wiring or connectors, or resetting the control module.
8. Is replacing the entire mirror assembly necessary to fix the B154B code?
In many cases, replacing the entire mirror assembly is the most effective solution if the internal components are faulty.
9. How much does it cost to repair the B154B code on a 2016 GMC Sierra?
The cost varies depending on whether you replace the mirror assembly or repair wiring, but it typically ranges from $200 to $500 for parts and labor.
10. Can I reset the B154B code without fixing the issue?
Clearing the code without addressing the underlying problem may temporarily turn off the warning, but the code will likely return until the issue is resolved.
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