AutoCodes – Generic – U1898

U1898 Code - Starter/Generator Control Module Lost Communication With Hybrid 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 Hybrid Control Module (HCM), Hybrid Control Module harness is open or shorted, Hybrid 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: U1898 indicates Starter/Generator Control Module Lost Communication With Hybrid Control Module.
Common causes: Common causes include Faulty Hybrid Control Module (HCM), Hybrid Control Module harness is open or shorted, Hybrid 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 812

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 U1898 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 U1898 - Starter/Generator Control Module Lost Communication With Hybrid Control Module - AutoCodes.com — U1898 Code - Starter/Generator Control Module Lost Communication With Hybrid Control Module

What does this mean?

What are the Possible Causes of the DTC U1898?

Faulty Hybrid Control Module (HCM)
Hybrid Control Module harness is open or shorted
Hybrid Control Module circuit poor electrical connection
Faulty Starter/Generator Control Module (SGCM)

How to Fix the DTC U1898?

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 U1898 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 U1898 code?

Need more information on how to fix the U1898 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1898 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1898 Buick — Starter/Generator Control Module Lost Communication With Hybrid Control Module
U1898 Cadillac — Starter/Generator Control Module Lost Communication With Hybrid Control Module
U1898 Chevrolet — Starter/Generator Control Module Lost Communication With Hybrid Control Module
U1898 GMC — Starter/Generator Control Module Lost Communication With Hybrid 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 U1898 Code

1. What are the common symptoms of OBDII code U1898?

Common symptoms include the vehicle not starting, the engine stalling, poor performance, and the hybrid system not engaging properly.

2. What are the potential causes of OBDII code U1898?

Possible causes include damaged wiring or connections between the starter/generator control module and the hybrid control module, a faulty control module, or software issues.

3. How can I diagnose OBDII code U1898?

Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking the wiring and connections between the modules, and conducting a thorough inspection of the control modules.

4. What are some repair tips for resolving OBDII code U1898?

Repair tips may include repairing or replacing damaged wiring, ensuring all connections are secure, updating software if applicable, and replacing the faulty control module if necessary.

5. Can OBDII code U1898 be fixed without professional help?

While basic troubleshooting like checking connections can be done by DIY enthusiasts, resolving the code may require advanced diagnostic equipment and expertise, so seeking professional help is recommended.

6. Is it safe to continue driving with OBDII code U1898 present?

It is not recommended to continue driving with this code active, as it can lead to further damage to the hybrid system and potentially cause safety issues on the road.

7. How much does it typically cost to repair OBDII code U1898?

The cost of repair can vary depending on the specific issue causing the code, but it may range from a hundred to a few hundred dollars for parts and labor.

8. Will resetting the OBDII code U1898 make it go away permanently?

Simply resetting the code without addressing the underlying issue will not make it go away permanently. The problem causing the code needs to be diagnosed and fixed to prevent it from reoccurring.

9. Are there any recalls related to OBDII code U1898?

Recalls related to this specific code may vary depending on the vehicle make and model, so it's recommended to check with the manufacturer or a dealership for any relevant recall information.

10. Can extreme weather conditions affect OBDII code U1898?

Extreme weather conditions like excessive heat or moisture can potentially exacerbate electrical issues that may trigger this code, so it's important to keep the vehicle well-maintained in all weather conditions.