AutoCodes – Generic – B399B

B399B Code - Rearview Camera Supply Circuit

Quick Answer

The Video Processing Control Module performs fault detection on itself and the cameras attached to it. Common causes include Faulty Rearview Camera, Rearview Camera harness is open or shorted, Rearview Camera circuit poor electrical connection. 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: B399B indicates Rearview Camera Supply Circuit.
Common causes: Common causes include Faulty Rearview Camera, Rearview Camera harness is open or shorted, Rearview Camera circuit poor electrical connection.
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.

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Code Popularity 1,682

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B399B Description

The Video Processing Control Module performs fault detection on itself and the cameras attached to it. The Diagnostic Trouble Code (DTC) sets when the Rearview camera 6V reference circuit is shorted to voltage or is shorted to ground.

OBDII Code B399B - Rearview Camera Supply Circuit - AutoCodes.com — B399B Code - Rearview Camera Supply Circuit

What does this mean?

What are the Possible Causes of the DTC B399B?

Faulty Rearview Camera
Rearview Camera harness is open or shorted
Rearview Camera circuit poor electrical connection
Faulty Video Processing Control Module

How to Fix the DTC B399B?

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

B399B 01 Rearview Camera Supply Circuit Short to Battery
B399B 02 Rearview Camera Supply Circuit Short to Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B399B 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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Need Help with the Code?

Get the B399B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B399B Buick — Rearview Camera Supply Circuit
B399B Cadillac — Rearview Camera Supply Circuit
B399B Chevrolet — Rearview Camera Supply Circuit
B399B GMC — Rearview Camera Supply 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 B399B Code

1. What are common symptoms of OBDII code B399B (Rearview Camera Supply Circuit)?

- Common symptoms include a malfunctioning rearview camera, loss of camera display on the dashboard screen, and a warning light on the dashboard related to the rearview camera.

2. What are the possible causes of OBDII code B399B?

- The code B399B can be triggered by issues such as a faulty rearview camera, damaged wiring or connectors in the camera circuit, or a malfunction in the camera power supply.

3. How can I diagnose the cause of OBDII code B399B?

- Diagnose the issue by visually inspecting the rearview camera and its connections, checking for damaged wires, using a multimeter to test the power supply, and scanning the system for any related error codes.

4. Can a blown fuse cause OBDII code B399B?

- Yes, a blown fuse in the rearview camera circuit can lead to the OBDII code B399B. It is important to check and replace any blown fuses as part of the diagnostic process.

5. What are some repair tips for resolving OBDII code B399B?

- Repair tips include checking and repairing damaged wiring, replacing a faulty rearview camera, ensuring proper power supply to the camera, and clearing the error code after repairs are completed.

6. Do I need specialized tools to fix OBDII code B399B?

- While specialized tools may not be required, having a multimeter for testing electrical components and a diagnostic scanner to clear the error code can be helpful in diagnosing and repairing the issue.

7. Can I reset OBDII code B399B without fixing the underlying issue?

- While you can clear the error code temporarily, it is important to address the underlying issue causing OBDII code B399B to prevent the problem from recurring and ensure the proper functioning of the rearview camera system.

8. Is it safe to drive with OBDII code B399B active?

- It is generally safe to drive with OBDII code B399B as long as the rearview camera is not essential for your driving needs. However, it is recommended to address the issue promptly to maintain full functionality of the camera system.

9. How much does it typically cost to repair OBDII code B399B?

- The cost of repairing OBDII code B399B can vary depending on the underlying cause of the issue. Costs may include parts such as a new rearview camera, wiring repairs, labor charges, and diagnostic fees.

10. Can OBDII code B399B be a recurring problem?

- OBDII code B399B can be a recurring problem if the underlying issue is not properly diagnosed and repaired. It is important to address the root cause of the code to prevent it from coming back in the future.