B154A 2014 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 2014 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 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 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 2014 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 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 B154A 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 B154A 2014 GMC Sierra Code
1. What does the OBDII code B154A indicate on a 2014 GMC Sierra?
The code B154A indicates a "Driver Mirror Internal Malfunction," which means there is a fault detected within the driver's side mirror's internal components or circuitry.
2. What symptoms might I notice if my 2014 GMC Sierra has the B154A code?
Symptoms can include the driver's side mirror not adjusting properly, failing to respond to control inputs, or unusual noises when attempting to move the mirror.
3. What are the common causes of the B154A code in a 2014 GMC Sierra?
Common causes include faulty mirror motor, damaged wiring or connectors in the mirror circuit, or a malfunctioning control switch.
4. How can I diagnose the B154A code in my 2014 GMC Sierra?
Diagnosis should start with a visual inspection of the mirror's wiring and connectors for any obvious damage or disconnections. Follow this with electrical tests using a multimeter to check for power and ground at the mirror motor, and scan tool checks to monitor mirror control signals.
5. Can I drive my 2014 GMC Sierra with the B154A code active?
Yes, you can still drive your vehicle, but the functionality of the driver's side mirror may be compromised, which can affect visibility and safety. It's advisable to address the issue as soon as possible.
6. What steps are involved in repairing the B154A code on a 2014 GMC Sierra?
Repair steps may include replacing the faulty mirror motor, repairing or replacing any damaged wiring or connectors, and possibly replacing the control switch if it's determined to be faulty.
7. Is the B154A code a serious issue for the 2014 GMC Sierra?
While not critical for the engine's operation, it is a safety-related issue as it pertains to driver visibility. It should be addressed promptly to ensure safe driving conditions.
8. What tools are needed to fix the B154A code on a 2014 GMC Sierra?
Repairing this code may require basic hand tools to remove the door panel and mirror, a multimeter for electrical diagnostics, and possibly a scan tool to interpret the control module data.
9. How much does it typically cost to resolve the B154A code in a 2014 GMC Sierra?
The cost can vary widely depending on the specific repair needed. Simple wiring repairs might cost around $100 to $200, while replacing the entire mirror assembly could run upwards of $500, depending on parts and labor rates.
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