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Engine-Codes – Generic – U216B

U216B Code - Lost Communication With Rear Object Detection Control Module

Quick Answer

The U216B diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with the Rear Object Detection Control Module. Common causes include Faulty Rear Object Detection Control Module, Wiring or electrical connection issues between the module and the vehicle's computer system, Corrosion or damage to the module connectors. 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
U216B indicates Lost Communication With Rear Object Detection Control Module.
Common causes
Common causes include Faulty Rear Object Detection Control Module, Wiring or electrical connection issues between the module and the vehicle's computer system, Corrosion or damage to the module connectors.
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 Aug 30, 2024
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Code U216B Description

The U216B diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with the Rear Object Detection Control Module. This module is responsible for monitoring and controlling the rear object detection system, which helps the driver by alerting them to obstacles or objects behind the vehicle while backing up. When communication is lost with this module, it can result in the rear object detection system not functioning properly, potentially leading to a safety hazard.

OBDII Code U216B - Lost Communication With Rear Object Detection Control Module
U216B Code - Lost Communication With Rear Object Detection Control Module

Common Causes of U216B

  1. Faulty Rear Object Detection Control Module.
  2. Wiring or electrical connection issues between the module and the vehicle's computer system.
  3. Corrosion or damage to the module connectors.
  4. Software or programming issues within the Rear Object Detection Control Module.
  5. Water damage or exposure to moisture affecting the module.

Symptoms of U216B

  1. Rear object detection system not providing any alerts or warnings.
  2. Malfunction indicator light (MIL) or check engine light illuminated on the dashboard.
  3. Rear object detection system activating randomly or inconsistently.
  4. Rear object detection system displaying error messages on the dashboard.
  5. Vehicle reversing camera not displaying properly or not functioning at all.

How to Fix U216B

  1. Perform a diagnostic scan with an OBD-II scanner to retrieve the specific trouble codes and pinpoint the issue.
  2. Inspect the wiring harness and connectors for any damage, corrosion, or loose connections.
  3. Test the Rear Object Detection Control Module for functionality and replace if necessary.
  4. Clear the trouble codes and reset the vehicle's computer system to see if the issue persists.
  5. Conduct a road test to verify that the rear object detection system is now functioning correctly.

Cost to Fix U216B

The typical repair costs for resolving the U216B code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, replacing a faulty Rear Object Detection Control Module can cost anywhere from $200 to $500, including parts and labor. However, additional diagnostic time and potential wiring repairs may increase the total cost. It's recommended to inquire with local auto repair shops for a more accurate estimate based on the vehicle's make and model.

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Code U216B Information for Specific Makes

  • U216B Buick — Lost Communication With Rear Object Detection Control Module
  • U216B Cadillac — Lost Communication With Rear Object Detection Control Module
  • U216B Chevrolet — Lost Communication With Rear Object Detection Control Module
  • U216B GMC — Lost Communication With Rear Object Detection Control Module
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 U216B Code

1. What are the common symptoms of OBDII code U216B, Lost Communication With Rear Object Detection Control Module?

The common symptoms include malfunctioning rear object detection system, disabled parking assistance features, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code U216B?

The code U216B can be triggered by issues such as a faulty rear object detection control module, damaged wiring or connectors, low battery voltage, or software glitches.

3. How can I diagnose the root cause of code U216B?

To diagnose the issue, you can perform a visual inspection of the wiring and connectors, check the battery voltage, use a diagnostic scanner to retrieve trouble codes, and conduct a proper diagnostic procedure to pinpoint the exact cause.

4. Is it safe to continue driving with OBDII code U216B present?

While the vehicle may still be operable with this code, it is not recommended to ignore it. It is crucial to address the underlying issue promptly to ensure the proper functioning of the rear object detection system.

5. Can I repair OBDII code U216B on my own?

Depending on your automotive knowledge and skills, you may be able to address the issue on your own by checking the wiring, connectors, and control module. However, for complex repairs or software-related issues, it is advisable to seek professional help.

6. How much does it typically cost to repair OBDII code U216B?

The cost of repairing code U216B can vary depending on the root cause of the issue, the extent of the damage, and whether you choose to address it yourself or take it to a mechanic. Costs may range from a simple connector repair to a complete module replacement.

7. Will resetting the trouble codes make OBDII code U216B disappear permanently?

Simply resetting the trouble codes may temporarily clear the code, but if the underlying issue is not fixed, it is likely to reappear after a short period. It is essential to diagnose and address the root cause for a permanent solution.

8. How long does it take to repair OBDII code U216B?

The repair time for code U216B can vary depending on the complexity of the issue, the availability of parts, and the expertise of the technician. Simple fixes may take a few hours, while more involved repairs could take longer.

9. Can extreme weather conditions affect the occurrence of OBDII code U216B?

Extreme weather conditions such as extreme heat or cold can potentially impact the electrical components and wiring associated with the rear object detection control module, leading to the triggering of code U216B. Regular maintenance and inspections can help prevent weather-related issues.

10. Is OBDII code U216B a common issue in specific vehicle makes or models?

Code U216B related to lost communication with the rear object detection control module can occur in various vehicle makes and models equipped with this feature. It is not limited to a specific manufacturer but may be more prevalent in vehicles with advanced parking assistance systems.

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