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B127B 2017 GMC Sierra Code - Rearview Camera Input Signal Circuit

Quick Answer

The B127B diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the rearview camera input signal circuit. Common causes include Faulty rearview camera, Damaged wiring or connectors in the camera system, Malfunctioning control module responsible for processing camera signals. 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 2017 GMC Sierra indicates Rearview Camera Input Signal Circuit.
Common causes
Common causes include Faulty rearview camera, Damaged wiring or connectors in the camera system, Malfunctioning control module responsible for processing camera signals.
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 09, 2024
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Code B127B 2017 GMC Sierra Description

The B127B diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the rearview camera input signal circuit. In modern vehicles, rearview cameras have become a crucial safety feature, aiding drivers in parking and reversing by providing a clear view of the area behind the vehicle. The rearview camera system consists of a camera mounted on the back of the vehicle, a display screen in the dashboard, and various wiring and control modules.

OBDII Code B127B 2017 GMC Sierra - Rearview Camera Input Signal Circuit
B127B 2017 GMC Sierra Code - Rearview Camera Input Signal Circuit

Common Causes of B127B 2017 GMC Sierra

  1. Faulty rearview camera.
  2. Damaged wiring or connectors in the camera system.
  3. Malfunctioning control module responsible for processing camera signals.
  4. Corrosion or water damage in the camera system components.
  5. Poor electrical connections or grounds in the camera system.

Symptoms of B127B 2017 GMC Sierra

  1. Rearview camera screen displays a blank or distorted image.
  2. Rearview camera does not activate when the vehicle is put in reverse.
  3. Error message on the dashboard related to the rearview camera system.
  4. Inability to toggle between different camera views (e.g., wide-angle, top-down).

How to Fix B127B 2017 GMC Sierra

  1. Begin by visually inspecting the rearview camera, wiring, and connectors for any visible damage or corrosion. Replace any damaged components as necessary.
  2. Check the connections between the camera, control module, and display screen to ensure they are secure and free of debris.
  3. Use a multimeter to test the voltage and continuity of the wiring in the camera system to identify any potential shorts or open circuits.
  4. If the camera itself is faulty, replace it with a new unit that is compatible with the vehicle's system.
  5. Clear the DTC from the vehicle's computer using an OBD-II scanner after completing the repair to reset the system and ensure the code does not return.

Cost to Fix B127B 2017 GMC Sierra

The cost of repairing the B127B code for the rearview camera input signal circuit on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair could range from $150 to $500, including the cost of a new camera unit if needed. However, prices can fluctuate based on location, the shop's hourly labor rates, and the complexity of the repair. It is recommended to obtain quotes from multiple auto repair shops to find the best price for the repair.

What does this mean?

Tech Notes for B127B 2017 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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B127B in a 2017 GMC Sierra related to the Rearview Camera Input Signal Circuit?

The common symptoms include a malfunctioning or non-functional rearview camera display on the vehicle's screen.

2. What are the possible causes of OBDII code B127B in a 2017 GMC Sierra?

Possible causes of this code include a faulty rearview camera, damaged wiring or connectors in the camera circuit, or a malfunctioning camera control module.

3. How can I diagnose the issue causing OBDII code B127B in my 2017 GMC Sierra?

Diagnosing the issue involves checking the rearview camera for physical damage, inspecting the wiring and connectors for any signs of wear or corrosion, and using a diagnostic tool to test the camera control module.

4. Can I repair OBDII code B127B in my 2017 GMC Sierra myself?

Depending on your expertise and tools available, you may be able to repair this issue yourself by replacing a faulty rearview camera, repairing damaged wiring, or addressing any issues with the camera control module.

5. Is it safe to drive my 2017 GMC Sierra with OBDII code B127B related to the Rearview Camera Input Signal Circuit?

It is generally safe to drive the vehicle with this code, but you may lose the functionality of the rearview camera until the issue is resolved.

6. How much does it typically cost to repair OBDII code B127B in a 2017 GMC Sierra at a dealership or repair shop?

The cost of repair can vary depending on the specific issue causing the code, but it may involve part replacement, labor costs, and diagnostic fees.

7. Are there any temporary fixes or workarounds for OBDII code B127B in a 2017 GMC Sierra?

Temporary fixes may include checking and securing any loose connections in the camera circuit or resetting the vehicle's electronics by disconnecting the battery for a few minutes.

8. Will resetting the OBDII code B127B in my 2017 GMC Sierra make it go away permanently?

Resetting the code may temporarily clear it, but if the underlying issue causing the code is not addressed, it is likely to reappear once the problem is detected again.

9. Can extreme weather conditions affect the Rearview Camera Input Signal Circuit in a 2017 GMC Sierra and trigger OBDII code B127B?

Extreme weather conditions such as heat, cold, or moisture can potentially affect the rearview camera circuit, leading to issues that trigger this OBDII code.

10. Is it necessary to have the rearview camera recalibrated after repairing OBDII code B127B in a 2017 GMC Sierra?

In some cases, recalibrating the rearview camera system may be necessary after repairing the issue to ensure proper functionality and alignment of the camera display.

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