B154B 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code
What does the OBDII code B154B mean on a 2014 GMC Sierra?
The B154B code indicates a "Passenger Mirror Internal Malfunction," meaning there is an issue with the internal components or circuitry of the passenger-side mirror.
What are the common symptoms of code B154B on a 2014 GMC Sierra?
Common symptoms include the passenger-side mirror not adjusting, folding, or heating properly, or being completely unresponsive.
What causes the B154B code to appear on a 2014 GMC Sierra?
Possible causes include a faulty mirror motor, damaged wiring or connectors, software glitches, or a malfunctioning mirror control module.
Can a blown fuse cause the B154B code on a 2014 GMC Sierra?
Yes, a blown fuse associated with the mirror system can interrupt power and trigger the B154B code.
How can I diagnose the B154B code on a 2014 GMC Sierra?
Start by visually inspecting the mirror assembly, checking for damaged wiring, loose connectors, and testing the mirror motor. Use a scan tool to confirm the fault and pinpoint the issue.
Is the B154B code related to a wiring problem?
Yes, damaged or shorted wiring between the mirror and the control module can cause this code to appear.
Can I fix the B154B code by replacing the passenger-side mirror?
Replacing the mirror may fix the issue if the problem is due to an internal mirror malfunction, but diagnosing other components first is recommended.
Does the B154B code require programming after repairs?
If the mirror control module or related electronics are replaced, reprogramming or calibrating may be necessary to ensure proper operation.
Can the B154B code affect other systems in my 2014 GMC Sierra?
This code typically only impacts the passenger-side mirror functions and does not usually interfere with other vehicle systems.
Should I take my GMC Sierra to a mechanic for the B154B code?
If basic inspections don’t resolve the issue, visiting a professional mechanic with proper diagnostic tools is recommended for accurate troubleshooting and repair.
Discuss the causes and fixes for B154B 2014 GMC Sierra OBDII Code
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