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B127B 2016 GMC Sierra Code - Rearview Camera Input Signal Circuit

Quick Answer

The B127B diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the rearview camera input signal circuit. Common causes include Faulty rearview camera, Damaged wiring harness or connectors, Corrosion or loose connections in the circuit. 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 2016 GMC Sierra indicates Rearview Camera Input Signal Circuit.
Common causes
Common causes include Faulty rearview camera, Damaged wiring harness or connectors, Corrosion or loose connections in the circuit.
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 17, 2024
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Code B127B 2016 GMC Sierra Description

The B127B diagnostic trouble code (DTC) for a 2016 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 a crucial component for enhancing driver visibility and safety when reversing or parking. When this circuit malfunctions, it can lead to a loss of the rearview camera functionality, making it more challenging for the driver to navigate in reverse.

OBDII Code B127B 2016 GMC Sierra - Rearview Camera Input Signal Circuit
B127B 2016 GMC Sierra Code - Rearview Camera Input Signal Circuit

Common Causes of B127B 2016 GMC Sierra

  1. Faulty rearview camera.
  2. Damaged wiring harness or connectors.
  3. Corrosion or loose connections in the circuit.
  4. Issues with the display screen or control module.
  5. Water damage or exposure to environmental elements affecting the circuit.

Symptoms of B127B 2016 GMC Sierra

  1. Loss of rearview camera display on the screen.
  2. Distorted or flickering image from the rearview camera.
  3. Error message or warning light related to the rearview camera system.
  4. Inability to switch between camera views (e.g., rearview, top-down view).

How to Fix B127B 2016 GMC Sierra

  1. Begin by visually inspecting the rearview camera, wiring harness, and connectors for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the wiring harness and connectors to identify any open circuits or shorts.
  3. Check the power supply to the rearview camera and display screen to ensure proper voltage is being supplied.
  4. If necessary, replace the rearview camera, wiring harness, connectors, or display screen based on the diagnostic findings.
  5. Clear the DTC from the vehicle's system using a diagnostic scan tool and test the rearview camera system to verify proper functionality.

Cost to Fix B127B 2016 GMC Sierra

The typical repair costs for addressing the B127B DTC on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the parts/labour required for the repair. In general, replacing a faulty rearview camera or repairing damaged wiring harness/connectors can range from $200 to $500. However, if the issue involves more extensive repairs or component replacements, the cost could exceed $1000. It's important to note that diagnostic time and labour rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. For a more accurate estimate, it's recommended to consult with a local auto repair shop.

What does this mean?

Tech Notes for B127B 2016 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 2016 GMC Sierra Code

1. What does the OBDII code B127B mean on a 2016 GMC Sierra?

B127B indicates a problem with the rearview camera input signal circuit, suggesting an issue with the camera or its connection to the vehicle’s display system.

2. What are common symptoms of the B127B code in a 2016 GMC Sierra?

Symptoms include a blank or distorted rearview camera display, intermittent camera operation, or a complete failure of the backup camera system.

3. What causes the B127B code to appear in a 2016 GMC Sierra?

Common causes include a faulty rearview camera, damaged wiring or connectors, a malfunctioning display unit, or a software issue in the vehicle’s body control module (BCM).

4. How can I diagnose the B127B code on my GMC Sierra?

Check the rearview camera and its wiring for damage, inspect the connectors for corrosion or loose connections, and use a diagnostic scanner to verify the code and test the camera signal.

5. Can the B127B code be triggered by a software issue?

Yes, outdated or corrupted software in the body control module or display system can sometimes cause the B127B code to appear.

6. How do I fix the B127B code on my 2016 GMC Sierra?

Repairs may involve replacing the rearview camera, repairing or replacing damaged wiring, cleaning or securing connectors, or updating the vehicle’s software.

7. Is it safe to drive with the B127B code active?

Yes, the vehicle can still be driven, but the rearview camera system may not function properly, which could reduce parking and backing safety.

8. How much does it cost to repair the B127B code on a GMC Sierra?

Repair costs vary but typically range from $100 to $500, depending on whether the issue is with the camera, wiring, or software.

9. Can I reset the B127B code without repairs?

You can clear the code with a diagnostic scanner, but if the underlying issue isn’t resolved, the code will likely return.

10. Does the B127B code affect other vehicle systems?

Generally, no. This code is specific to the rearview camera system and does not typically impact other vehicle functions.

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