AutoCodes – Cadillac – U216B Cadillac

U216B Cadillac 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 Cadillac 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 676

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

What does this mean?

What are the Possible Causes of the DTC U216B Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of the OBDII code U216B in a Cadillac related to lost communication with the rear object detection control module?

- Common symptoms include inoperative rear parking sensors, disabled rear cross-traffic alert feature, and warning messages on the instrument cluster.

2. What are possible causes of the U216B code indicating lost communication with the rear object detection control module in a Cadillac?

- Possible causes include a faulty rear object detection control module, damaged wiring or connectors, software issues, or a communication bus fault.

3. How can I diagnose the U216B code related to lost communication with the rear object detection control module in my Cadillac?

- Diagnose the U216B code by checking the rear object detection control module for power and ground, inspecting the wiring and connectors for damage, and using a scan tool to communicate with the module.

4. Can I drive my Cadillac safely with the U216B code for lost communication with the rear object detection control module?

- It is generally safe to drive with the U216B code, but be aware that rear parking assistance features may be disabled, and rear object detection may not be operational.

5. How can I repair the U216B code indicating lost communication with the rear object detection control module in my Cadillac?

- Repair options include replacing the rear object detection control module, repairing damaged wiring or connectors, updating software if necessary, or addressing any communication bus issues.

6. Will resetting the OBDII code U216B related to lost communication with the rear object detection control module fix the issue in my Cadillac?

- Resetting the code may temporarily clear the warning, but it is important to diagnose and address the root cause to prevent the code from recurring.

7. Is it possible to bypass the rear object detection control module to resolve the U216B code in my Cadillac?

- Bypassing the module is not recommended as it may compromise safety features and functionality. It is best to repair or replace the module as needed.

8. Can extreme weather conditions affect the occurrence of the U216B code in a Cadillac's rear object detection system?

- Extreme weather conditions can potentially cause electrical issues or damage to components, leading to communication failures and triggering the U216B code.

9. Are there any software updates available to address the U216B code for lost communication with the rear object detection control module in a Cadillac?

- Check with your Cadillac dealership or authorized service center for any available software updates that may help resolve communication issues with the rear object detection control module.

10. How can regular maintenance help prevent the U216B OBDII code related to lost communication with the rear object detection control module in my Cadillac?

- Regular maintenance, including checking and cleaning connectors, inspecting wiring for damage, and keeping software up to date, can help prevent issues leading to the U216B code.