AutoCodes – GMC – U216B GMC

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

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Object Detection Control Module, Rear Object Detection Control Module harness is open or shorted, Rear Object Detection Control Module 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: U216B GMC indicates Lost Communication With Rear Object Detection Control Module.
Common causes: Common causes include Faulty Rear Object Detection Control Module, Rear Object Detection Control Module harness is open or shorted, Rear Object Detection Control Module 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 832

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 Jun 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U216B GMC Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U216B GMC - Lost Communication With Rear Object Detection Control Module - AutoCodes.com — U216B GMC Code - Lost Communication With Rear Object Detection Control Module

What does this mean?

What are the Possible Causes of the DTC U216B GMC?

Faulty Rear Object Detection Control Module
Rear Object Detection Control Module harness is open or shorted
Rear Object Detection Control Module circuit poor electrical connection

How to Fix the DTC U216B GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U216B GMC 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 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.