AutoCodes – GMC – U1887 GMC

U1887 GMC Code - Energy Storage Control Module Lost Communication With Starter/Generator 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 Starter/Generator Control Module (SGCM), Starter/Generator Control Module harness is open or shorted, Starter/Generator 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: U1887 GMC indicates Energy Storage Control Module Lost Communication With Starter/Generator Control Module.
Common causes: Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module harness is open or shorted, Starter/Generator 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 554

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 U1887 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 U1887 GMC - Energy Storage Control Module Lost Communication With Starter/Generator Control Module - AutoCodes.com — U1887 GMC Code - Energy Storage Control Module Lost Communication With Starter/Generator Control Module

What does this mean?

What are the Possible Causes of the DTC U1887 GMC?

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

How to Fix the DTC U1887 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 U1887 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.

Need more information about the U1887 GMC code?

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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 U1887 GMC Code

What does the OBDII code U1887 mean?

The OBDII code U1887 indicates that there is a communication issue between the Energy Storage Control Module (ESCM) and the Starter/Generator Control Module (SGCM) in a GMC vehicle.

What are the common symptoms of the U1887 code?

Common symptoms include warning lights on the dashboard, reduced engine performance, difficulty starting the vehicle, and issues with the hybrid or electric vehicle system.

What could cause the U1887 code to trigger?

The code can be triggered by faulty wiring or connectors, a malfunctioning ESCM or SGCM, software issues, or a dead battery affecting communication between the modules.

How can I diagnose the U1887 code effectively?

To diagnose the U1887 code, start by checking the vehicle's battery voltage, inspect wiring and connectors for damage, use a scan tool to check for additional codes, and verify that the modules are functioning correctly.

What are some common repair solutions for the U1887 code?

Common repairs may include replacing damaged wiring or connectors, reprogramming or replacing the ESCM or SGCM, and ensuring proper battery voltage and connections.

Is it safe to drive a vehicle with the U1887 code?

While it may be possible to drive the vehicle, it is not recommended due to potential reduced performance and the risk of further damage to the hybrid or electrical systems.

How much does it typically cost to fix the U1887 code?

Repair costs can vary widely based on the cause of the code, ranging from a simple wiring repair costing around $100 to more complex module replacements that can exceed $1,000.

Can the U1887 code affect fuel economy?

Yes, the U1887 code can affect fuel economy, especially in hybrid or electric vehicles, as it may lead to inefficient operation of the propulsion system.

Do I need a special tool to clear the U1887 code?

Yes, you typically need an OBDII scanner or diagnostic tool to read and clear the U1887 code and perform any necessary reprogramming of the modules.