AutoCodes – GMC – U1897 GMC

U1897 GMC 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 GMC 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 705

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

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 GMC?

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 GMC 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 GMC Code

1. What are common symptoms of OBDII code U1897 in a GMC vehicle?

- Common symptoms include issues with starting the vehicle, problems with the generator, and potential issues with the energy storage system.

2. What are the possible causes of OBDII code U1897 in a GMC vehicle?

- The code U1897 typically indicates a communication error between the Starter/Generator Control Module and the Energy Storage Control Module. This can be caused by wiring issues, module malfunctions, or software glitches.

3. How can I diagnose the OBDII code U1897 in my GMC vehicle?

- Diagnosing this code usually requires a professional OBDII scanner to read the code and identify the specific communication error between the modules. Checking the wiring connections and module functionality may also be necessary.

4. Is it safe to continue driving with OBDII code U1897 present in my GMC vehicle?

- It is not recommended to continue driving with this code present, as it can lead to further electrical system malfunctions and potential issues with starting and charging the vehicle.

5. Can I repair OBDII code U1897 in my GMC vehicle myself?

- While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, repairing this code often requires specialized equipment and knowledge. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. How much does it typically cost to repair OBDII code U1897 in a GMC vehicle?

- The cost of repairing this code can vary depending on the specific cause of the communication error. It is advisable to get a diagnostic from a mechanic to determine the exact repair cost.

7. Are there any preventive maintenance tips to avoid OBDII code U1897 in a GMC vehicle?

- Regularly checking the electrical connections, keeping the modules clean and free of debris, and ensuring proper battery maintenance can help prevent communication errors that trigger this code.

8. Does OBDII code U1897 affect the overall performance of a GMC vehicle?

- Yes, this code can affect the overall performance of the vehicle, particularly in terms of starting reliability, charging system operation, and overall electrical system functionality.

9. Can a faulty energy storage control module cause OBDII code U1897 in a GMC vehicle?

- Yes, a malfunctioning Energy Storage Control Module can contribute to the communication error that triggers code U1897. It is one of the components to inspect when diagnosing this issue.

10. How urgent is it to address OBDII code U1897 in a GMC vehicle?

- It is recommended to address this code promptly to prevent further electrical system issues and ensure the safe and reliable operation of the vehicle.