AutoCodes – Cadillac – U18A6 Cadillac

U18A6 Cadillac Code - Lost Communication With Right Object Detection Control Module On Dedicated Bus 1

Quick Answer

The side object sensor modules use radar to determine the presence of objects nearby. Common causes include Faulty Right Object Detection Control Module, Right Object Detection Control Module harness is open or shorted, Right 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: U18A6 Cadillac indicates Lost Communication With Right Object Detection Control Module On Dedicated Bus 1.
Common causes: Common causes include Faulty Right Object Detection Control Module, Right Object Detection Control Module harness is open or shorted, Right 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 2,324

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18A6 Cadillac Description

The side object sensor modules use radar to determine the presence of objects nearby. The left side object sensor is the master that communicates on serial data. There is a private communication network between the left and right sensors. The scan tool can communicate only with the left sensor. Side blind zone alert is active when the vehicle is out of the park or the parking brake is off on manual transmission vehicles. If a vehicle is detected in the side blind zone, the warning symbols will illuminate on the appropriate side. The warning symbols will vary brightness based on the ambient light conditions. When an object is detected in the left side blind zone, the side object sensor module sends a message to the right sensor through serial data. The right sensor then supplies voltage to illuminate the visual indicator on the left side outside rearview mirror. When an object is detected in the right-side blind zone, the right side object sensor will supply a voltage to illuminate the visual indicator on the right side outside rearview mirror. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18A6 Cadillac - Lost Communication With Right Object Detection Control Module On Dedicated Bus 1 - AutoCodes.com — U18A6 Cadillac Code - Lost Communication With Right Object Detection Control Module On Dedicated Bus 1

What does this mean?

What are the Possible Causes of the DTC U18A6 Cadillac?

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

How to Fix the DTC U18A6 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 U18A6 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 U18A6 Cadillac Code

1. What are the common symptoms of OBDII code U18A6 in a Cadillac related to "Lost Communication With Right Object Detection Control Module On Dedicated Bus 1"?

- Common symptoms include malfunctioning right object detection system, disabled parking sensors, and error messages on the dashboard.

2. What are the possible causes of OBDII code U18A6 in a Cadillac?

- The code U18A6 can be triggered by issues such as a faulty right object detection control module, damaged wiring or connectors, or a communication bus fault.

3. How can I diagnose the cause of OBDII code U18A6 in my Cadillac?

- Diagnosis involves checking the wiring and connectors for damage, testing the right object detection control module, and using a diagnostic scanner to assess communication on the dedicated bus.

4. Can I still drive my Cadillac with the U18A6 code present?

- It is generally safe to drive the vehicle with the U18A6 code, but it is recommended to address the issue promptly to ensure the proper functioning of the object detection system.

5. How can I repair OBDII code U18A6 in my Cadillac?

- Repair options include replacing the right object detection control module, repairing any damaged wiring or connectors, and clearing the fault code with a diagnostic scanner.

6. Are there any tips for preventing OBDII code U18A6 from recurring in my Cadillac?

- Regularly inspecting the object detection system components, ensuring proper wiring connections, and addressing any issues promptly can help prevent the code from reoccurring.

7. Can a DIY enthusiast fix the OBDII code U18A6 issue in a Cadillac?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to address the U18A6 code by following repair guides and using diagnostic equipment.

8. Is it necessary to reset the OBDII code U18A6 after making repairs in a Cadillac?

- After repairing the underlying issue causing the U18A6 code, it is essential to clear the code using a diagnostic scanner to reset the system and ensure proper functionality.

9. Will the U18A6 code cause my Cadillac to fail an emissions test?

- The U18A6 code is not directly related to emissions, so it should not cause your Cadillac to fail an emissions test. However, it is still recommended to address the issue promptly.

10. Can extreme weather conditions affect the occurrence of OBDII code U18A6 in a Cadillac?

- Extreme weather conditions, such as temperature fluctuations or moisture exposure, can potentially impact the object detection control module and wiring, leading to the U18A6 code.