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B127B 2018 GMC Sierra Code - Rearview Camera Input Signal Circuit

Quick Answer

The B127B diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the rearview camera input signal circuit. Common causes include Damaged wiring or connectors in the rearview camera circuit, Faulty rearview camera module, Malfunctioning display screen. 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
B127B 2018 GMC Sierra indicates Rearview Camera Input Signal Circuit.
Common causes
Common causes include Damaged wiring or connectors in the rearview camera circuit, Faulty rearview camera module, Malfunctioning display screen.
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 Sep 16, 2024
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Code B127B 2018 GMC Sierra Description

The B127B diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the rearview camera input signal circuit. This code indicates that there is a malfunction in the circuit responsible for transmitting the video signal from the rearview camera to the vehicle's display screen. The rearview camera is an essential safety feature that assists drivers in maneuvering the vehicle in reverse and helps prevent accidents by providing a clear view of obstacles behind the vehicle.

OBDII Code B127B 2018 GMC Sierra - Rearview Camera Input Signal Circuit
B127B 2018 GMC Sierra Code - Rearview Camera Input Signal Circuit

Common Causes of B127B 2018 GMC Sierra

  1. Damaged wiring or connectors in the rearview camera circuit.
  2. Faulty rearview camera module.
  3. Malfunctioning display screen.
  4. Issues with the control module that processes the camera signal.
  5. Water damage or corrosion affecting the rearview camera components.

Symptoms of B127B 2018 GMC Sierra

  1. Rearview camera display not working or showing a distorted image.
  2. Error message on the display screen related to the rearview camera.
  3. Inability to switch to the rearview camera view when in reverse.
  4. Intermittent camera functionality, with the display cutting in and out.
  5. Audible warning alerts indicating a rearview camera system malfunction.

How to Fix B127B 2018 GMC Sierra

  1. Begin by visually inspecting the wiring and connectors in the rearview camera circuit for any damage or corrosion. Repair or replace any faulty components.
  2. Test the rearview camera module to determine if it is functioning correctly. Replace the module if necessary.
  3. Check the display screen for any defects or malfunctions. Repair or replace the screen as needed.
  4. Verify the operation of the control module that processes the camera signal. Replace the module if it is found to be faulty.
  5. Clear the DTC from the vehicle's computer system using a diagnostic scan tool and test the rearview camera system to ensure proper functionality.

Cost to Fix B127B 2018 GMC Sierra

The cost of repairing the rearview camera input signal circuit on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that prices may vary based on the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. Additionally, diagnostic time and labor rates can impact the final cost, with rates typically ranging from $80 to $150 per hour. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for B127B 2018 GMC Sierra

A poor video image can be caused by ice, snow, and mud buildup on the lens of the Rearview Camera. Also, extreme lighting conditions can affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high or low temperatures can also affect image quality. An open or high resistance in the shield of the video signal circuit can also cause a distorted screen.

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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 B127B 2018 GMC Sierra Code

1. What does OBDII code B127B mean on a 2018 GMC Sierra?

Code B127B indicates an issue with the rearview camera input signal circuit, meaning the system is not receiving or processing the camera's signal correctly.

2. What are common symptoms of the B127B code?

The most common symptoms include a blank or distorted rearview camera display, intermittent video feed, or no image on the infotainment screen when in reverse.

3. What causes code B127B to appear on a 2018 GMC Sierra?

This code can be caused by a faulty rearview camera, damaged wiring or connectors, a malfunctioning infotainment system, or a software issue.

4. Can a bad rearview camera trigger the B127B code?

Yes, a defective rearview camera is a common cause of this code as it prevents the input signal from being properly transmitted to the display system.

5. How can I diagnose the B127B code?

Start by inspecting the rearview camera and its wiring for damage, corrosion, or loose connections. Use a scan tool to test the camera's signal and verify the code.

6. Is the B127B code a serious issue?

While it doesn’t affect vehicle drivability, it compromises rear visibility, which may pose a safety risk when reversing.

7. How do I fix the B127B code on a 2018 GMC Sierra?

Fixes may include repairing or replacing damaged wires or connectors, replacing the rearview camera, or reprogramming the infotainment system.

8. Can software updates resolve the B127B code?

In some cases, a software update for the infotainment system can resolve the issue, especially if it’s caused by a system glitch.

9. How much does it cost to repair the B127B code?

Repair costs vary but may range from $100 to $500, depending on whether the camera or other components need replacement.

10. Can I drive with the B127B code active on my GMC Sierra?

Yes, you can drive, but the rearview camera may not function, so extra caution is needed when reversing.

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