AutoCodes – Generic – U18A6

U18A6 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 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 8,338

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

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?

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 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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Information for Specific Makes

U18A6 Buick — Lost Communication With Right Object Detection Control Module On Dedicated Bus 1
U18A6 Cadillac — Lost Communication With Right Object Detection Control Module On Dedicated Bus 1
U18A6 Chevrolet — Lost Communication With Right Object Detection Control Module On Dedicated Bus 1
U18A6 GMC — Lost Communication With Right Object Detection Control Module On Dedicated Bus 1

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 Code

1. What are the common symptoms of OBDII code U18A6?

The common symptoms of code U18A6 include issues with the right object detection system, such as malfunctioning sensors or warning signals not working properly.

2. What could cause the OBDII code U18A6 to trigger?

The U18A6 code is typically triggered by a loss of communication between the vehicle's main control module and the right object detection control module on dedicated bus 1.

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

To diagnose the cause of code U18A6, it is recommended to check the wiring connections between the control modules, inspect the object detection sensors for any damage, and use a diagnostic scan tool to analyze communication errors.

4. Can a faulty sensor trigger the U18A6 trouble code?

Yes, a faulty sensor in the right object detection system can potentially trigger the U18A6 trouble code due to communication issues with the control module.

5. What are the repair options for OBDII code U18A6?

Repair options for code U18A6 may include checking and repairing any damaged wiring, replacing faulty sensors in the object detection system, and ensuring proper communication between control modules.

6. Is it safe to continue driving with the U18A6 trouble code present?

It is recommended to address the U18A6 trouble code promptly to prevent any potential safety hazards or further damage to the right object detection system. It is best to have the issue diagnosed and repaired as soon as possible.

7. Can a DIY enthusiast fix the U18A6 code at home?

Depending on the level of expertise and access to tools, some DIY enthusiasts may be able to address the U18A6 trouble code by checking wiring connections, inspecting sensors, and clearing the code with a diagnostic scan tool. However, more complex issues may require professional assistance.

8. How long does it typically take to repair OBDII code U18A6?

The repair time for code U18A6 can vary depending on the specific cause of the issue. Simple fixes like reconnecting a loose wire may take a short amount of time, while replacing sensors or addressing communication errors could require more extensive work.

9. Will resetting the trouble codes make the U18A6 code disappear permanently?

Simply resetting the trouble codes may temporarily clear the U18A6 code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is crucial to diagnose and repair the root cause to prevent the code from coming back.

10. How much does it cost to fix OBDII code U18A6 at a repair shop?

The cost of repairing code U18A6 at a repair shop can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different shops and compare prices before proceeding with the repair.