Telematics Communication Control Module
Part Number: 9876781

Used OnStar TCU Replacement Unit

Critical Pre-Purchase Warning

1. This is a USED second-hand module.
2. The internal eSIM function is unavailable / cannot be activated normally.
3. This unit is NOT plug-and-play. Professional programming, coding and vehicle matching procedure is compulsory after installation.

Basic Specifications

Part Number: 9876781
Item Name: Telematics / OnStar Communication Control Module (TCU)
Condition: Used / Second Hand Pull-off Unit
eSIM Status: Function Unavailable, Cannot Activate Cellular Service
Installation Requirement: Not Plug & Play, Programming Required

Product Function Introduction

  • This is GM factory telematics control unit (TCU), responsible for OnStar system, vehicle cellular network, emergency call, remote vehicle communication, car APP data interaction.
  • Used to repair faults: OnStar system failure, vehicle 4G network offline, emergency call error, unable to bind mobile APP, telematics related trouble codes.
  • Physical plug and mounting structure matches original factory layout for direct physical installation.
  • Due to disabled eSIM chip, cellular data and network service cannot be restored on this module.

Important Installation Reminders

  • eSIM inside this module is non-functional; do not purchase if you need full working cellular network service.
  • After physical installation, professional repair shop must perform module programming, VIN matching and system configuration.
  • Buyer shall confirm this part number fits your specific vehicle model before ordering, we are not responsible for incompatibility returns caused by unconfirmed fitment.
  • Used unit may have minor cosmetic scratches from previous vehicle disassembly, normal for second-hand auto parts.

Package Includes

1 × Used Telematics Control Module (Part #: 9876781)