B154A 2017 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 2017 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 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 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 2017 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 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 B154A 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 B154A 2017 GMC Sierra Code
1. What does the OBDII code B154A indicate on a 2017 GMC Sierra?
The code B154A indicates a Driver Mirror Internal Malfunction, meaning there is an issue with the internal components or circuitry of the driver's side mirror.
2. What are common symptoms of the B154A code in a 2017 GMC Sierra?
Symptoms may include the driver's side mirror not adjusting properly, not responding to controls, or unusual noises when trying to adjust the mirror.
3. What causes the B154A code to be triggered in a 2017 GMC Sierra?
This code can be triggered by faults such as a failed mirror motor, damaged wiring or connectors, or a malfunctioning control switch.
4. How can I diagnose the B154A code in my 2017 GMC Sierra?
Diagnosis should start with a visual inspection of the mirror's components including wires and connectors. Follow up with electrical testing using a multimeter to check for voltage and ground at the mirror motor and control switch.
5. What steps should be taken to repair a B154A code on a 2017 GMC Sierra?
Repair steps typically involve replacing or repairing the faulty mirror motor, fixing any damaged wiring or connectors, or replacing a defective control switch.
6. Is it safe to drive my 2017 GMC Sierra with the B154A code?
While it's generally safe, the malfunctioning mirror may impair your ability to drive safely by limiting visibility, so it’s advisable to address the issue as soon as possible.
7. Can the B154A code affect other functions of my vehicle?
The B154A code specifically relates to the driver's mirror, so it shouldn't directly affect other vehicle functions. However, underlying electrical issues might impact other electronic systems.
8. What tools are needed to fix the B154A code on a 2017 GMC Sierra?
Tools needed might include a multimeter for electrical diagnosis, basic hand tools for accessing and replacing components, and possibly a diagnostic scanner to reset the code once the issue is fixed.
9. How often does the B154A code occur in the 2017 GMC Sierra?
The occurrence can vary based on usage and the condition of the vehicle's electrical components. It's not commonly reported but can happen if there's damage to the mirror system or electrical faults.
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