AutoCodes – Chevrolet – B127B Chevrolet

B127B Chevrolet Code - Rearview Camera Input Signal Circuit

Quick Answer

When the transmission is placed into R, a 12 V signal is sent to the Rearview Camera indicating that camera operation is requested. Common causes include Faulty Rearview Camera, Rearview Camera harness is open or shorted, Rearview Camera circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B127B Chevrolet indicates Rearview Camera Input Signal Circuit.
Common causes: Common causes include Faulty Rearview Camera, Rearview Camera harness is open or shorted, Rearview Camera circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 16,741

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B127B Chevrolet Description

When the transmission is placed into R, a 12 V signal is sent to the Rearview Camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the Rearview Camera. The Rearview Camera sends a video image to the Human Machine Interface Control Module Bypass Module through a video signal + and a video signal − circuit. The Human Machine Interface Control Module Bypass Module passes the video image to Human Machine Interface Control Module via video signal + and a video signal − circuits. The Human Machine Interface Control Module Bypass Module is used to ensure the Human Machine Interface Control Module produces a quality rear vision camera image to be displayed on the Info Display Module when the vehicle is placed in reverse gear. In the event, the Human Machine Interface Control Module Bypass Module detects an issue with the camera image generated by the Human Machine Interface Control Module, such as black, solid color, frozen, or image other than the camera image, the Human Machine Interface Control Module Bypass Module will assume control of the image to the Info Display Module and displays a raw camera image with no park assist projection lines or object detection symbols for the entire reverse cycle.
The Human Machine Interface Control Module Bypass Module is part of the video signal + and a video signal − circuits path from the Rearview Camera to the Human Machine Interface Control Module as well as the digital Low Voltage Differential Signaling (LVDS) path (USB cable) between the Human Machine Interface Control Module and Info Display Module and needs to be active for either signal to be received by these modules. The Human Machine Interface Control Module Bypass Module is not connected to serial data and uses the reverse lamp voltage input to determine the vehicle gear state.
The Diagnostic Trouble Code (DTC) will be set when the video signal from the rearview camera has not been received by the Radio for 2.5 s.

OBDII Code B127B Chevrolet - Rearview Camera Input Signal Circuit - AutoCodes.com — B127B Chevrolet Code - Rearview Camera Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127B Chevrolet?

Faulty Rearview Camera
Rearview Camera harness is open or shorted
Rearview Camera circuit poor electrical connection
Faulty Human Machine Interface Control Module
Faulty Info Display Module

How to Fix the DTC B127B Chevrolet?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B127B Chevrolet 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.

Need more information about the B127B Chevrolet code?

Need more information on how to fix the B127B Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Chevrolet Models

B127B 2014 Chevrolet Silverado — Rearview Camera Input Signal Circuit
B127B 2015 Chevrolet Silverado — Rearview Camera Input Signal Circuit
B127B 2016 Chevrolet Silverado — Rearview Camera Input Signal Circuit
B127B 2017 Chevrolet Silverado — Rearview Camera Input Signal Circuit
B127B 2018 Chevrolet Silverado — Rearview Camera Input Signal Circuit

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 Chevrolet Code

1. What are the common symptoms of OBDII code B127B Chevrolet related to the Rearview Camera Input Signal Circuit?

The common symptoms include a malfunctioning rearview camera display, intermittent camera operation, or a complete loss of camera function.

2. What are the possible causes of OBDII code B127B Chevrolet?

Possible causes can include a faulty rearview camera, damaged wiring or connectors in the camera system, or a malfunctioning camera control module.

3. How can I diagnose the issue related to OBDII code B127B Chevrolet?

You can start by checking the rearview camera wiring and connectors for any visible damage, testing the camera itself for functionality, and using a diagnostic scanner to pinpoint the exact location of the problem.

4. Is it safe to drive with OBDII code B127B Chevrolet triggered?

While you can still drive your vehicle with this code, it is recommended to address the issue promptly to ensure proper functionality of the rearview camera system, especially for safe reversing.

5. What are some repair tips for fixing OBDII code B127B Chevrolet?

Repair tips can include replacing the rearview camera if it is faulty, repairing or replacing damaged wiring, and resetting the camera control module to clear the code.

6. Can a DIY enthusiast fix OBDII code B127B Chevrolet at home?

Depending on your skill level and access to tools, DIY enthusiasts may be able to address this code by following repair guides, but professional diagnosis and repair are recommended for complex issues.

7. Will resetting the OBDII code B127B Chevrolet make the problem go away permanently?

Resetting the code may temporarily clear the warning, but if the underlying issue causing the code is not fixed, it is likely to reappear. It is essential to diagnose and address the root cause for a permanent solution.

8. How much does it typically cost to repair OBDII code B127B Chevrolet?

The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services. Getting a few quotes from different mechanics can help you determine a reasonable estimate.

9. Are there any recalls or technical service bulletins related to OBDII code B127B Chevrolet?

It's advisable to check with Chevrolet or your local dealership for any recalls or technical service bulletins related to this specific OBDII code, as they may provide valuable information or assistance for the repair.

10. Can OBDII code B127B Chevrolet affect other vehicle systems or functions?

While this code specifically relates to the rearview camera input signal circuit, electrical issues in the camera system can sometimes cause interference with other electronic systems. Regular maintenance and prompt repairs can prevent potential complications.