AutoCodes – Generic – U1889

U1889 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 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 1,052

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

What does this mean?

What are the Possible Causes of the DTC U1889?

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?

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 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 U1889 code?

Need more information on how to fix the U1889 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1889 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1889 Buick — Hybrid Control Module Lost Communication With Body Control Module
U1889 Cadillac — Hybrid Control Module Lost Communication With Body Control Module
U1889 Chevrolet — Hybrid Control Module Lost Communication With Body Control Module
U1889 GMC — Hybrid Control Module Lost Communication With Body Control Module

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 Code

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

- Common symptoms include loss of communication between the hybrid control module and body control module, dashboard warning lights, and potential drivability issues.

2. What could cause the Hybrid Control Module to lose communication with the Body Control Module?

- Possible causes include wiring issues, faulty connectors, a damaged control module, software glitches, or a weak battery.

3. How can I diagnose the problem related to code U1889?

- Diagnosis typically involves using a scan tool to retrieve the code, checking for other related trouble codes, and conducting a thorough inspection of the wiring and connectors between the modules.

4. Is it safe to drive with OBDII code U1889 present?

- It is not recommended to drive with this code active, as it can lead to potential safety hazards and further damage to the vehicle's systems.

5. Can I repair OBDII code U1889 by resetting the system?

- Resetting the system may temporarily clear the code, but it is important to identify and address the underlying cause to prevent the code from reoccurring.

6. How much does it typically cost to repair OBDII code U1889?

- The cost of repair can vary depending on the exact cause of the communication loss, but it may involve labor charges for diagnosis and repair, as well as potential parts replacement.

7. Are there any DIY tips for troubleshooting OBDII code U1889?

- DIY tips may include checking for loose or damaged wiring, inspecting connectors for corrosion, and ensuring all modules are securely connected.

8. Can a software update fix OBDII code U1889?

- In some cases, a software update provided by the manufacturer may resolve communication issues between modules and eliminate the code.

9. What kind of specialist should I consult for help with OBDII code U1889?

- Consulting a qualified automotive technician or a dealership specializing in hybrid vehicles is recommended for diagnosing and repairing issues related to this code.

10. How long does it typically take to repair OBDII code U1889?

- The repair time can vary depending on the exact cause of the communication loss and the complexity of the repair process, but it may take a few hours to a day to resolve the issue.