AutoCodes – Chevrolet – B127B 2018 Chevrolet Silverado

B127B 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 458

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B127B 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Rearview Camera Input Signal Circuit - AutoCodes.com — B127B 2018 Chevrolet Silverado Code - Rearview Camera Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127B 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the B127B 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B127B 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B127B in a 2018 Chevrolet Silverado related to the Rearview Camera Input Signal Circuit?

- Common symptoms include a non-functional or distorted rearview camera display on the vehicle's screen.

2. What are possible causes of the B127B OBDII code in a 2018 Chevrolet Silverado?

- Possible causes of this code may include a faulty rearview camera, damaged wiring or connectors, or a malfunctioning camera control module.

3. How can I diagnose the Rearview Camera Input Signal Circuit issue in my 2018 Chevrolet Silverado?

- To diagnose the problem, you may need to visually inspect the camera and wiring, check for loose connections, and use a scan tool to retrieve the specific error codes.

4. Can I repair the B127B code issue in my 2018 Chevrolet Silverado myself?

- Depending on your expertise, you may be able to repair the issue yourself by replacing the faulty rearview camera, repairing damaged wiring, or addressing any connectivity issues.

5. Is it safe to drive my 2018 Chevrolet Silverado with the Rearview Camera Input Signal Circuit problem?

- While it is generally safe to drive without a functioning rearview camera, it is recommended to address the issue promptly to ensure optimal safety and convenience.

6. Will resetting the OBDII code B127B in my 2018 Chevrolet Silverado fix the Rearview Camera Input Signal Circuit problem?

- Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the problem is likely to recur. It's important to diagnose and repair the root cause.

7. How much does it typically cost to repair the B127B OBDII code related to the Rearview Camera Input Signal Circuit in a 2018 Chevrolet Silverado?

- Repair costs can vary depending on the specific issue, but replacing a rearview camera or repairing wiring may cost a few hundred dollars at a dealership or auto repair shop.

8. Are there any recalls or service bulletins related to the B127B code in a 2018 Chevrolet Silverado?

- It's advisable to check with a Chevrolet dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any relevant recalls or service bulletins for this issue.

9. Can extreme weather conditions impact the Rearview Camera Input Signal Circuit in my 2018 Chevrolet Silverado?

- Yes, extreme temperatures or moisture exposure can potentially affect the rearview camera system, leading to connectivity issues or component failures.

10. How can I prevent the B127B OBDII code from recurring in my 2018 Chevrolet Silverado after repair?

- To prevent the code from reappearing, ensure proper installation of any new components, regularly inspect the camera system for damage, and address any wiring issues promptly.