AutoCodes – Chevrolet – B127B 2017 Chevrolet Silverado

B127B 2017 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 2017 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.

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Code Popularity 457

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 2017 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 2017 Chevrolet Silverado - Rearview Camera Input Signal Circuit - AutoCodes.com — B127B 2017 Chevrolet Silverado Code - Rearview Camera Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127B 2017 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 2017 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 2017 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.

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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 Chevrolet Silverado Code

1. What does the OBDII code B127B mean on a 2017 Chevrolet Silverado?

The code B127B indicates an issue with the Rearview Camera Input Signal Circuit, which may result in a malfunction of the rearview camera system.

2. What are the common symptoms of the B127B code in a 2017 Chevrolet Silverado?

Symptoms include the rearview camera not displaying an image, a distorted or blank screen, or an intermittent camera feed.

3. What causes the B127B code to appear on a 2017 Chevrolet Silverado?

Common causes include a faulty rearview camera, damaged wiring or connectors, a malfunctioning display unit, or a problem with the camera control module.

4. How can I diagnose the B127B code on a 2017 Chevrolet Silverado?

Start by inspecting the rearview camera's wiring and connectors for damage or corrosion. Use a scan tool to check for additional codes and perform system tests.

5. Can a damaged rearview camera trigger the B127B code?

Yes, a damaged or malfunctioning rearview camera can cause the B127B code by failing to send the correct input signal.

6. How do I fix the B127B code on a 2017 Chevrolet Silverado?

Repairs may include replacing the rearview camera, repairing or replacing damaged wiring or connectors, or updating/reprogramming the camera control module.

7. Is the B127B code a serious issue for a 2017 Chevrolet Silverado?

While it doesn't affect drivability, it can compromise safety by disabling the rearview camera, which is critical for reversing visibility.

8. Can a software issue cause the B127B code in a 2017 Chevrolet Silverado?

Yes, outdated or corrupted software in the camera control module or display unit can potentially trigger this code.

9. How much does it cost to repair the B127B code on a 2017 Chevrolet Silverado?

Costs vary depending on the issue, but replacing the rearview camera typically ranges from $150 to $400, including parts and labor.

10. Can I clear the B127B code without repairing the issue?

Clearing the code without addressing the root cause is not recommended, as the issue is likely to recur and affect the rearview camera's functionality.