AutoCodes – Buick – U1897 Buick

U1897 Buick Code - Starter/Generator Control Module Lost Communication With Energy Storage 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 Energy Storage Control Module (ESCM), Energy Storage Control Module harness is open or shorted, Energy Storage 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: U1897 Buick indicates Starter/Generator Control Module Lost Communication With Energy Storage Control Module.
Common causes: Common causes include Faulty Energy Storage Control Module (ESCM), Energy Storage Control Module harness is open or shorted, Energy Storage 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 541

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 U1897 Buick 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 U1897 Buick - Starter/Generator Control Module Lost Communication With Energy Storage Control Module - AutoCodes.com — U1897 Buick Code - Starter/Generator Control Module Lost Communication With Energy Storage Control Module

What does this mean?

What are the Possible Causes of the DTC U1897 Buick?

Faulty Energy Storage Control Module (ESCM)
Energy Storage Control Module harness is open or shorted
Energy Storage Control Module circuit poor electrical connection
Faulty Starter/Generator Control Module (SGCM)

How to Fix the DTC U1897 Buick?

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 U1897 Buick 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 U1897 Buick Code

1. What does the OBDII code U1897 mean on a Buick?

U1897 indicates that the Starter/Generator Control Module (SGCM) has lost communication with the Energy Storage Control Module (ESCM). This is typically related to a communication issue within the vehicle's network.

2. What are the common symptoms of code U1897 in a Buick?

Symptoms may include a Check Engine Light, reduced hybrid/electric vehicle performance, failure to start, or limited charging functionality.

3. What causes the U1897 code to appear?

The code can be caused by faulty wiring or connectors, a failed SGCM or ESCM, a network communication issue, or a software-related malfunction.

4. Can a weak battery cause the U1897 code?

Yes, a weak or failing 12V battery or issues with the high-voltage battery system can disrupt communication between modules and trigger this code.

5. How do you diagnose a U1897 code on a Buick?

Start by checking the wiring and connectors between the SGCM and ESCM for damage or corrosion. Use a scan tool to monitor communication signals and test the functionality of both modules.

6. Is the U1897 code specific to Buicks with hybrid or electric systems?

Yes, this code is typically associated with Buick hybrid or electric vehicles that utilize a Starter/Generator Control Module and Energy Storage Control Module.

7. Can you drive a Buick with the U1897 code?

Driving with this code is not recommended, as it may lead to reduced performance, charging issues, or potential damage to the hybrid/electric system.

8. How much does it cost to fix a U1897 code on a Buick?

Repair costs vary depending on the cause, but diagnosing and repairing wiring issues may range from $100 to $300, while module replacement can cost $500 or more.

9. What tools are needed to repair a U1897 code?

Youâ€™ll need an advanced scan tool capable of reading manufacturer-specific codes, a multimeter for testing circuits, and possibly module reprogramming equipment.

10. Can a software update fix the U1897 code on a Buick?

In some cases, a software update for the affected modules may resolve communication issues and clear the code. Check with a dealership for available updates.