AutoCodes – Chevrolet – U1889 Chevrolet

U1889 Chevrolet Code - Hybrid Control Module Lost Communication With Body Control Module

Quick Answer

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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: U1889 Chevrolet indicates Hybrid Control Module Lost Communication With Body Control Module.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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 530

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1889 Chevrolet Description

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The Diagnostic Trouble Code (DTC) is reported on a class 2 link to the scan tool by Powertrain Control Module (PCM) even if they may be set by different modules. The DTC will set when a node alive message has not been received from an identified module within the last 5 seconds after establishing class 2 serial data communication, or a supervised high-speed GMLAN message has not been received.

OBDII Code U1889 Chevrolet - Hybrid Control Module Lost Communication With Body Control Module - AutoCodes.com — U1889 Chevrolet Code - Hybrid Control Module Lost Communication With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U1889 Chevrolet?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC U1889 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 U1889 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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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 U1889 Chevrolet Code

1. What are common symptoms of the U1889 Chevrolet OBDII code?

Common symptoms include loss of communication between the hybrid control module and body control module, erratic behavior of electrical components, and warning lights on the dashboard.

2. What are the possible causes of the U1889 Chevrolet code?

Possible causes may include a faulty hybrid control module, a malfunctioning body control module, damaged wiring or connectors between the modules, or a software issue.

3. How can I diagnose the U1889 code?

Diagnosis typically involves using a professional OBDII scanner to communicate with the modules, checking the wiring and connectors for damage, and verifying software updates for the modules.

4. Can I drive my vehicle with the U1889 code?

It is not recommended to drive the vehicle with the U1889 code present, as it can lead to unreliable performance and potential safety hazards due to communication issues between critical control modules.

5. How can I repair the U1889 Chevrolet code?

Repair options may include replacing the faulty hybrid control module or body control module, repairing damaged wiring or connectors, and performing software updates to ensure proper communication between the modules.

6. Will resetting the code make it go away permanently?

Resetting the code may temporarily clear the warning lights, but if the underlying issue causing the U1889 code is not addressed, it is likely to reappear once the communication problem between the modules persists.

7. Is the U1889 code specific to certain Chevrolet models?

The U1889 code is specific to Chevrolet vehicles with hybrid powertrains and may not apply to all models within the brand's lineup.

8. Can a DIY enthusiast repair the U1889 code at home?

While some basic troubleshooting steps can be performed at home, diagnosing and repairing the U1889 code often requires specialized equipment and professional expertise due to the complexity of communication modules in modern vehicles.

9. How much does it typically cost to fix the U1889 Chevrolet code?

The cost of fixing the U1889 code can vary depending on the underlying issue, parts needed for replacement, labor costs, and whether the repair is done at a dealership or an independent repair shop. It is recommended to obtain quotes from multiple sources.

10. How urgent is it to address the U1889 code?

It is important to address the U1889 code promptly to ensure the proper functioning of critical control modules in the vehicle and to prevent potential performance issues or safety concerns associated with communication failures between the hybrid control module and body control module.