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Engine-Codes – GMC – B154B 2017 GMC Sierra

B154B 2017 GMC Sierra Code - Passenger Mirror Internal Malfunction

Quick Answer

The B154B diagnostic trouble code (DTC) indicates an internal malfunction within the passenger side mirror of a 2017 GMC Sierra. Common causes include Faulty internal components within the mirror assembly, such as motors or sensors, Damaged or corroded wiring harness or connectors leading to the mirror, A malfunctioning body control module (BCM) that fails to communicate properly with the mirror. 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 internal components within the mirror assembly, such as motors or sensors, Damaged or corroded wiring harness or connectors leading to the mirror, A malfunctioning body control module (BCM) that fails to communicate properly with the mirror.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 10, 2024
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Code B154B 2017 GMC Sierra Description

The B154B diagnostic trouble code (DTC) indicates an internal malfunction within the passenger side mirror of a 2017 GMC Sierra. This code is part of the vehicle's body control module (BCM) diagnostics and is specifically related to the mirror's electronic components. The passenger mirror is equipped with various features, including power adjustment, heating, and possibly integrated turn signals or blind-spot monitoring. When the BCM detects a fault in the mirror's internal circuitry or communication failure with other vehicle systems, it triggers the B154B code.

OBDII Code B154B 2017 GMC Sierra - Passenger Mirror Internal Malfunction
B154B 2017 GMC Sierra Code - Passenger Mirror Internal Malfunction

Common Causes of B154B 2017 GMC Sierra

  1. Faulty internal components within the mirror assembly, such as motors or sensors.
  2. Damaged or corroded wiring harness or connectors leading to the mirror.
  3. A malfunctioning body control module (BCM) that fails to communicate properly with the mirror.
  4. Water intrusion or moisture damage affecting the mirror's electrical components.
  5. Physical damage to the mirror assembly, such as from an accident or impact.

Symptoms of B154B 2017 GMC Sierra

  1. The passenger side mirror does not adjust or respond to controls.
  2. The heating function of the passenger mirror is inoperative.
  3. Warning lights or messages related to the mirror appear on the dashboard.
  4. Unusual noises or grinding sounds when attempting to adjust the mirror.
  5. The mirror may be stuck in one position or may not return to its original position after adjustment.

How to Fix B154B 2017 GMC Sierra

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the B154B code and check for any additional codes that may provide insight into the issue.
  2. Visual Inspection: Inspect the wiring harness and connectors leading to the passenger mirror for any signs of damage, corrosion, or loose connections.
  3. Component Testing: Test the internal components of the mirror, including motors and heating elements, to determine if they are functioning correctly.
  4. Wiring Repair/Replacement: If damaged wiring or connectors are found, repair or replace them as necessary to restore proper electrical connectivity.
  5. Mirror Assembly Replacement: If the internal components of the mirror are faulty and cannot be repaired, consider replacing the entire mirror assembly with a new or refurbished unit.

Cost to Fix B154B 2017 GMC Sierra

The typical repair costs for addressing the B154B code can vary significantly based on the specific issue identified during diagnosis. Generally, the cost for parts, such as a new mirror assembly, can range from $150 to $500, depending on whether it's an OEM or aftermarket part. Labor costs can add an additional $80 to $150 per hour, with most repairs taking 1 to 3 hours. Therefore, the total cost for repair could range from $250 to $1,000. It's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops commonly charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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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