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Engine-Codes – GMC – U216B GMC

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

Quick Answer

The U216B diagnostic trouble code (DTC) indicates that there is a communication problem with the Rear Object Detection Control Module in a GMC vehicle. Common causes include Faulty Rear Object Detection Control Module, Wiring or connection issues between the control module and sensors, Corrosion or damage to sensor components. 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 GMC indicates Lost Communication With Rear Object Detection Control Module.
Common causes
Common causes include Faulty Rear Object Detection Control Module, Wiring or connection issues between the control module and sensors, Corrosion or damage to sensor components.
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 Sep 11, 2024
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Code U216B GMC Description

The U216B diagnostic trouble code (DTC) indicates that there is a communication problem with the Rear Object Detection Control Module in a GMC vehicle. This module is responsible for controlling and monitoring the rear object detection system, which helps the driver detect obstacles or objects behind the vehicle when reversing. When communication is lost with this module, it can have a significant impact on the functionality of the rear object detection system.

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

Common Causes of U216B GMC

  1. Faulty Rear Object Detection Control Module
  2. Wiring or connection issues between the control module and sensors
  3. Corrosion or damage to sensor components
  4. Electrical issues such as a blown fuse or relay
  5. Software or programming issues within the control module

Symptoms of U216B GMC

  1. Loss of rear object detection system functionality
  2. No audible or visual alerts when objects are detected while reversing
  3. Warning light illuminated on the dashboard
  4. Limited visibility while reversing due to malfunctioning sensors

How to Fix U216B GMC

  1. Diagnose the U216B code using a diagnostic scanner to pinpoint the exact cause of the communication loss.
  2. Inspect the wiring and connections between the Rear Object Detection Control Module and sensors for any damage or corrosion.
  3. Test the sensors and components of the rear object detection system to ensure they are functioning correctly.
  4. Replace the faulty control module if necessary and reprogram it to communicate with the rest of the vehicle's systems.
  5. Clear the code from the vehicle's computer and perform a test drive to verify that the rear object detection system is operating as intended.

Cost to Fix U216B GMC

The typical repair costs for addressing the U216B DTC can vary depending on the specific cause of the communication loss. In general, replacing a faulty control module or repairing wiring issues can range from $200 to $600, including parts and labor. However, the total cost may increase if additional components need to be replaced or if there are underlying electrical issues that require more extensive repairs.

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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 U216B GMC Code

1. What are the common symptoms of OBDII code U216B GMC?

The common symptoms of code U216B GMC include a malfunction indicator light (MIL) illuminated on the dashboard, loss of rear object detection system functionality, and potential issues with parking sensors.

2. What could cause the OBDII code U216B GMC to appear?

The code U216B GMC, "Lost Communication With Rear Object Detection Control Module," can be triggered by a faulty rear object detection control module, wiring issues, a blown fuse, or a problem with the vehicle's computer network.

3. How can I diagnose the issue related to code U216B GMC?

To diagnose the issue related to code U216B GMC, you can use an OBDII scanner to retrieve the specific trouble codes, inspect the wiring and connectors related to the rear object detection control module, and perform a visual inspection for any visible damage or corrosion.

4. Are there any DIY repair tips for resolving code U216B GMC?

Some DIY repair tips for resolving code U216B GMC include checking and replacing blown fuses related to the rear object detection system, ensuring all wiring connections are secure, and resetting the trouble codes using an OBDII scanner after addressing any identified issues.

5. Can I still drive my vehicle with the OBDII code U216B GMC present?

While it may be possible to drive your vehicle with the code U216B GMC present, it is recommended to address the underlying issue promptly to prevent potential safety hazards and ensure the proper functioning of the rear object detection system.

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

The cost of repairing the U216B GMC code can vary depending on the exact cause of the issue. Simple fixes like replacing a blown fuse or repairing a damaged wire may be relatively inexpensive, while replacing a faulty control module could be more costly.

7. Is it necessary to visit a dealership or can any mechanic address the U216B GMC code?

Any qualified mechanic with experience in diagnosing and repairing automotive electrical systems should be able to address the U216B GMC code. You are not required to visit a dealership for this specific issue.

8. What other systems could be affected by the U216B GMC code?

In addition to the rear object detection system, other systems that may be affected by the U216B GMC code include the vehicle's network communication system, the parking assistance features, and potentially related safety systems.

9. How can I prevent the recurrence of the U216B GMC code in the future?

To prevent the recurrence of the U216B GMC code, it is essential to perform regular maintenance checks on the rear object detection system, address any wiring issues promptly, and ensure all electrical components are functioning correctly.

10. Is it safe to ignore the U216B GMC code if the rear object detection system is not essential to me?

While it may be tempting to ignore the U216B GMC code if the rear object detection system is not crucial to your driving needs, it is recommended to address the issue to maintain the overall health and functionality of your vehicle's electrical system.

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