AutoCodes – Generic – U1897

U1897 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 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 1,891

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

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?

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 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 U1897 code?

Need more information on how to fix the U1897 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1897 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1897 Buick — Starter/Generator Control Module Lost Communication With Energy Storage Control Module
U1897 Cadillac — Starter/Generator Control Module Lost Communication With Energy Storage Control Module
U1897 Chevrolet — Starter/Generator Control Module Lost Communication With Energy Storage Control Module
U1897 GMC — Starter/Generator Control Module Lost Communication With Energy Storage 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 U1897 Code

1. What are common symptoms of OBDII code U1897?

Symptoms may include the vehicle not starting, poor acceleration, or the hybrid system not functioning properly.

2. What can cause the OBDII code U1897 to appear?

This code is typically triggered when there is a communication error between the starter/generator control module and the energy storage control module.

3. How serious is OBDII code U1897?

While the vehicle may still operate, it is important to address this issue promptly to prevent further damage to the hybrid system components.

4. How can I diagnose the source of the communication error for code U1897?

A thorough inspection of the wiring, connectors, and modules involved in the communication network is crucial. Performing a diagnostic scan using a professional OBDII scanner can help pinpoint the exact cause.

5. Can I drive my vehicle with the U1897 code present?

It is not recommended to drive the vehicle for an extended period with this code active, as it can lead to potential performance issues and further damage to the hybrid system.

6. What are some repair tips for resolving code U1897?

Check for loose or damaged wiring connections, ensure the modules are properly communicating with each other, and consider resetting the fault codes after addressing any issues found.

7. How much does it typically cost to fix OBDII code U1897?

The cost of repair can vary depending on the exact cause of the communication error. It is advisable to consult with a professional mechanic to get an accurate estimate.

8. Can a DIY enthusiast fix OBDII code U1897?

While some basic checks and repairs can be performed by DIY enthusiasts, diagnosing and resolving communication errors between complex modules may require specialized tools and expertise.

9. Will resetting the fault codes make the U1897 code disappear permanently?

Resetting the fault codes without addressing the underlying issue will likely result in the code reappearing once the fault is detected again. It is crucial to fix the root cause of the communication error.

10. How long does it typically take to repair OBDII code U1897?

The repair time can vary depending on the complexity of the issue and the availability of parts. In some cases, it may be resolved quickly, while in others, it may take more time to diagnose and fix.