AutoCodes – Cadillac – U1898 Cadillac

U1898 Cadillac 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 Cadillac 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 472

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

What does this mean?

What are the Possible Causes of the DTC U1898 Cadillac?

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 Cadillac?

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 Cadillac 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 U1898 Cadillac Code

1. What are the common symptoms of OBDII code U1898 in a Cadillac related to Starter/Generator Control Module communication loss with the Hybrid Control Module?

The common symptoms include issues starting the vehicle, reduced power or performance, and illumination of the check engine light.

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

Possible causes include a faulty Starter/Generator Control Module, wiring or connection issues, a malfunctioning Hybrid Control Module, or software communication errors.

3. How can I diagnose OBDII code U1898 in my Cadillac?

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

4. What are some repair tips for addressing OBDII code U1898 in a Cadillac?

Repair tips may include checking and repairing any damaged wiring, ensuring proper connections between modules, resetting the system, updating software if applicable, and replacing any faulty modules.

5. Can I drive my Cadillac with OBDII code U1898 present?

It is not recommended to drive the vehicle with this code present, as it may lead to performance issues and potential further damage to the hybrid system components.

6. How serious is OBDII code U1898 in a Cadillac?

This code should be addressed promptly to prevent potential damage to the hybrid system components and ensure the proper functioning of the vehicle.

7. Are there any safety concerns associated with OBDII code U1898 in a Cadillac?

While there are no immediate safety concerns, addressing the code promptly is important to avoid potential issues with starting the vehicle or reduced power while driving.

8. Can OBDII code U1898 in a Cadillac be fixed at home, or do I need a professional mechanic?

Depending on your experience and access to tools, some basic repairs like checking connections and resetting the system may be done at home. However, more complex diagnostics and repairs may require a professional mechanic.

9. How much does it typically cost to repair OBDII code U1898 in a Cadillac?

The cost of repair can vary depending on the specific issue causing the code, the labor rates in your area, and whether any components need to be replaced. It's best to consult a mechanic for an accurate estimate.

10. Are there any recalls or technical service bulletins related to OBDII code U1898 in Cadillac vehicles?

It's recommended to check with a Cadillac dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any relevant recalls or bulletins related to this specific OBDII code in your vehicle.