AutoCodes – Chevrolet – U18D0 Chevrolet

U18D0 Chevrolet Code - Lost Communication With Active Safety Control Module 2 On High Speed CAN 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 2, Active Safety Control Module 2 harness is open or shorted, Active Safety Control Module 2 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: U18D0 Chevrolet indicates Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus.
Common causes: Common causes include Faulty Active Safety Control Module 2, Active Safety Control Module 2 harness is open or shorted, Active Safety Control Module 2 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 1,805

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 U18D0 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 U18D0 Chevrolet - Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus - AutoCodes.com — U18D0 Chevrolet Code - Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18D0 Chevrolet?

Faulty Active Safety Control Module 2
Active Safety Control Module 2 harness is open or shorted
Active Safety Control Module 2 circuit poor electrical connection

How to Fix the DTC U18D0 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 U18D0 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.

Need more information about the U18D0 Chevrolet code?

Need more information on how to fix the U18D0 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 U18D0 Chevrolet Code

What does the OBDII code U18D0 mean on a Chevrolet?

The U18D0 code indicates that the vehicle has lost communication with the Active Safety Control Module 2 on the high-speed CAN bus.

What are common symptoms of the U18D0 code in a Chevrolet?

Symptoms may include an illuminated check engine light, malfunctioning safety features like lane-keeping assist or adaptive cruise control, or warning messages on the dashboard.

What causes the U18D0 code to appear?

The code is typically caused by issues such as a faulty Active Safety Control Module 2, damaged wiring or connectors in the CAN bus, or software glitches in related control modules.

Can I drive my Chevrolet with the U18D0 code active?

While the car may still be drivable, critical safety features may not function properly, so itâ€™s important to address the issue promptly.

How do you diagnose the U18D0 code on a Chevrolet?

Diagnosis involves scanning for related codes, inspecting the wiring and connectors on the CAN bus, and testing the Active Safety Control Module 2 for proper operation.

What tools are needed to troubleshoot the U18D0 code?

Youâ€™ll need an OBDII scanner with CAN bus diagnostic capabilities, a multimeter for electrical testing, and the vehicleâ€™s wiring diagram for reference.

How can the U18D0 code be fixed?

Repairs may include replacing a damaged Active Safety Control Module 2, repairing or replacing damaged wiring or connectors, or updating module software.

Is the U18D0 code specific to Chevrolet vehicles?

While the code can appear on other makes, the specifics of the issue and the affected module depend on Chevroletâ€™s system design.

Can a low vehicle battery cause the U18D0 code?

Yes, a weak or low battery can cause communication issues on the CAN bus, potentially triggering the U18D0 code.

How much does it cost to repair a U18D0 code on a Chevrolet?

Repair costs can vary widely depending on the root cause, ranging from $100 for wiring repairs to over $1,000 if the Active Safety Control Module 2 needs replacement.