AutoCodes – GMC – U18CA GMC

U18CA GMC 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 GMC 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 699

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18CA 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. 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 GMC - Lost Communication With Active Safety Control Module 1 On Flexray Bus - AutoCodes.com — U18CA GMC 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 GMC?

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 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 U18CA 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.

Need more information about the U18CA GMC code?

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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 GMC Code

1. What are common symptoms of the U18CA GMC OBDII code related to lost communication with Active Safety Control Module 1 on Flexray bus?

- Common symptoms include warning lights on the dashboard, loss of functionality in safety systems like ABS, traction control, and stability control, and potential vehicle performance issues.

2. What are possible causes of the U18CA code indicating lost communication with Active Safety Control Module 1 on Flexray bus?

- Possible causes include issues with the Active Safety Control Module 1 itself, damaged wiring or connectors in the Flexray bus system, software glitches, or a faulty control module.

3. How can I diagnose the U18CA GMC trouble code for lost communication with Active Safety Control Module 1?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, inspecting the wiring and connectors in the Flexray bus system, and testing the Active Safety Control Module 1 for functionality.

4. Can I still drive my vehicle with the U18CA code present?

- It is not recommended to drive with the U18CA code active, as it may lead to safety system malfunctions and compromised vehicle performance. It's best to address the issue promptly.

5. How can I repair the U18CA error code related to lost communication with Active Safety Control Module 1 on Flexray bus?

- Repair methods may include repairing or replacing damaged wiring or connectors, reprogramming the control module, or replacing the Active Safety Control Module 1 if necessary.

6. Are there any common mistakes to avoid when addressing the U18CA GMC code?

- Common mistakes to avoid include ignoring the issue and continuing to drive the vehicle, misdiagnosing the problem without proper testing, and neglecting to check for other related codes.

7. Is it possible to reset the U18CA trouble code without fixing the underlying issue?

- While resetting the code may temporarily clear the warning lights, the issue causing the code will persist, leading to potential safety risks and performance issues. It's important to address the root cause of the problem.

8. Can a DIY enthusiast fix the U18CA code issue at home?

- Depending on the underlying cause, some DIY enthusiasts with automotive repair experience may be able to address the U18CA code by inspecting wiring and connectors or replacing components like the Active Safety Control Module 1.

9. How long does it typically take to repair the U18CA GMC code related to lost communication with Active Safety Control Module 1?

- The repair time can vary based on the cause of the issue and the complexity of the repair. Simple fixes like reconnecting a loose wire may take a short time, while replacing a control module could require more extensive work.

10. What should I do if the U18CA code keeps coming back after repairs?

- If the U18CA code persists after repairs, it may indicate a recurring issue that was not fully resolved. In such cases, further diagnostics may be necessary to identify and address the underlying problem.