AutoCodes – Chevrolet – U18CA Chevrolet

U18CA Chevrolet Code - Lost Communication With Active Safety Control Module 1 On Flexray Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Active Safety Control Module 1, Active Safety Control Module 1 harness is open or shorted, Active Safety Control Module 1 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: U18CA Chevrolet indicates Lost Communication With Active Safety Control Module 1 On Flexray Bus.
Common causes: Common causes include Faulty Active Safety Control Module 1, Active Safety Control Module 1 harness is open or shorted, Active Safety Control Module 1 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 580

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18CA Chevrolet 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. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18CA Chevrolet - Lost Communication With Active Safety Control Module 1 On Flexray Bus - AutoCodes.com — U18CA Chevrolet Code - Lost Communication With Active Safety Control Module 1 On Flexray Bus

What does this mean?

What are the Possible Causes of the DTC U18CA Chevrolet?

Faulty Active Safety Control Module 1
Active Safety Control Module 1 harness is open or shorted
Active Safety Control Module 1 circuit poor electrical connection

How to Fix the DTC U18CA Chevrolet?

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 U18CA Chevrolet 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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Need more information on how to fix the U18CA Chevrolet code? Get Access to Factory Service Manuals

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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 U18CA Chevrolet Code

What does the OBDII code U18CA mean for my Chevrolet?

The U18CA code indicates a lost communication with the Active Safety Control Module 1 on the FlexRay bus, which can impact various safety features in your vehicle.

What are the common symptoms of the U18CA code?

Common symptoms include warning lights on the dashboard, malfunctions of safety features like adaptive cruise control or lane-keeping assist, and possible erratic behavior of the vehicleâ€™s electronics.

What can cause the U18CA code to trigger?

Causes can include wiring issues, a faulty Active Safety Control Module, poor connections or corrosion in the wiring harness, or problems with the FlexRay communication bus.

How can I diagnose the U18CA code accurately?

To diagnose the U18CA code, use an OBDII scanner to confirm the code, check the wiring and connectors related to the Active Safety Control Module, and test the module itself for proper function.

Can I drive my Chevrolet safely with the U18CA code present?

While you can drive the vehicle, it is not recommended as safety features may be compromised, potentially increasing the risk of accidents.

What are some repair tips for fixing the U18CA code?

Repair tips include inspecting and repairing any damaged wiring, cleaning connectors, replacing the Active Safety Control Module if it's faulty, and ensuring the FlexRay bus is functioning correctly.

Is it necessary to reset the code after repairs?

Yes, after performing repairs, itâ€™s essential to clear the code with an OBDII scanner and perform a test drive to ensure that the issue is resolved and the code does not return.

Can the U18CA code be caused by other OBDII codes?

Yes, other related codes may indicate additional issues, so itâ€™s advisable to check for any other codes that could provide more insight into the underlying problem.

How much does it typically cost to repair the U18CA code?

Repair costs can vary widely based on the issue's root cause, but expect to pay anywhere from $100 to $1,000 or more, depending on whether you need wiring repairs or a module replacement.