B154B 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code
1. What does the OBDII code B154B mean for a 2017 GMC Sierra?
The code B154B indicates a "Passenger Mirror Internal Malfunction," meaning there is an issue with the internal circuitry or components of the passenger-side mirror.
2. What are the common symptoms of code B154B in a 2017 GMC Sierra?
Symptoms may include the passenger-side mirror not adjusting, folding, or heating properly, and the mirror may remain unresponsive to controls.
3. What causes the B154B code to appear in a GMC Sierra?
Common causes include faulty wiring or connectors, a malfunctioning mirror actuator, or internal damage to the mirror assembly.
4. Can I still drive my 2017 GMC Sierra with the B154B code?
Yes, the vehicle is still drivable, but the passenger-side mirror may not function properly, potentially impacting visibility and safety.
5. How do you diagnose the B154B code on a GMC Sierra?
Diagnosis typically involves inspecting the mirror wiring and connectors for damage, testing the mirror actuator, and checking for voltage irregularities with a multimeter.
6. Do I need to replace the passenger-side mirror to fix code B154B?
Not always; sometimes repairing damaged wiring or replacing the mirror actuator can resolve the issue without needing to replace the entire mirror assembly.
7. How much does it cost to fix the B154B code on a GMC Sierra?
Repair costs vary, but replacing a mirror actuator or repairing wiring can range from $100 to $300, while replacing the entire mirror assembly may cost $300 to $700.
8. Can the B154B code be cleared without repair?
Clearing the code without repair is possible, but the malfunction will likely persist, and the code may reappear.
9. Does the B154B code affect other systems in the vehicle?
The code typically only affects mirror functionality and does not impact other systems unless there is a broader electrical issue.
10. Can I fix the B154B code on my own?
If you're experienced with automotive repairs, you can attempt to inspect wiring and replace components, but professional help is recommended for accurate diagnosis and repair.
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