We Provide Full LDM Diagnostic Services
The electronic architecture of new energy vehicles is highly integrated, especially Li Auto, which uses the LDM (Li Auto Diagnostic Module) as the core module for vehicle diagnostics, fault management, and maintenance workflow.
To help overseas owners, repair shops, and technicians quickly locate Li Auto vehicle faults, we provide professional LDM diagnostic services, offering analysis of vehicle ECUs, fault codes, data streams, and communication networks.
⭐ What is LDM?
LDM (Li Auto Diagnostic Module) = The central diagnostic module of Li Auto vehicles
It integrates diagnostic information from all ECUs, including:
- Fault code (DTC) management
- UDS diagnostic communication
- Data stream reading
- Module matching and function initialization
- OTA upgrade security management
- Cloud synchronization of fault records
Simply put:
The LDM is the “diagnostic brain” of a Li Auto vehicle.
📡 Main Functions of the LDM
✔ 1. Centralized Management of All Vehicle Fault Codes
The LDM collects and processes all ECU information from:
- Powertrain system (MCU / BMS / DCDC / VCU)
- ADAS system (cameras, radars, LiDAR)
- Body system (BCM, door modules, HVAC, lighting)
- Cabin system (instrument cluster, multimedia, gateway)
All DTCs are integrated by the LDM for quick fault localization.
✔ 2. Supports UDS Diagnostics (ISO 14229)
The LDM provides a standard diagnostic entry, supporting:
- Reading/clearing fault codes
- Real-time data monitoring
- ECU software version query
- Special functions (HV activation, brake system initialization, etc.)
- Component matching and calibration
✔ 3. Data Stream Monitoring
It can read critical new-energy vehicle data such as:
- Battery temperature / SOH / SOC
- Motor load, torque, speed
- High-voltage system status
- Thermal management system operation
- ADAS perception and fusion module status
✔ 4. OTA Upgrade Security Management
Before and after OTA updates, the LDM is responsible for:
- Verifying module communication status
- Checking power safety
- Coordinating ECUs entering flashing mode
- Recording upgrade logs
- OTA rollback strategy
It plays a key role in OTA operational safety.
🛠 Common LDM Failure Symptoms
When the LDM or its communication network fails, the vehicle may show:
- Diagnostic tools cannot connect
- Multiple fault codes appear suddenly (“CAN network avalanche”)
- High-voltage system fails to activate
- ECU version reading failure
- OTA upgrade failure
- Vehicle warning: “System fault, please contact service”
This is when professional LDM diagnostic service is needed.
🔧 Our LDM Diagnostic Services
As a professional Li Auto repair and technical team, we provide:
1. Remote LDM Diagnostics
- Remote DTC reading
- Data stream monitoring
- Vehicle status analysis
- Fault root cause determination
- Communication network analysis (CAN / Ethernet)
2. Component Matching & Initialization (depending on model)
- BMS initialization/binding
- MCU/motor controller matching
- ADAS sensor calibration
- EPS (steering) initialization
- HV activation procedure verification
3. OTA Pre/Post Diagnostic Inspection
- OTA failure troubleshooting
- Interrupted upgrade analysis
- ECU version comparison
- Functional validation after upgrade
4. In-depth Vehicle Fault Analysis
- CAN harness interference investigation
- Module short-circuit detection
- High-voltage system fault chain analysis
- Full-vehicle communication network mapping
5. Overseas Vehicle Support
For Li Auto vehicles exported overseas (no official service network):
- Online diagnostics
- Remote fault analysis
- Spare part recommendations
- Repair solutions
⭐ Why Choose Us?
We are not just a parts provider —
We are a professional used-car and new-energy vehicle technical team, specializing in Li Auto maintenance, diagnostics, and export technical support.
Our advantages:
- Deep vehicle condition analysis expertise
- Familiar with Li Auto L-series & MEGA diagnostic architecture
- Strong electronic architecture understanding
- Professional-grade remote technical support
- Overseas users can receive expert service even without official support
We deliver:
Real LDM diagnostic solutions — not just fault code reading.
🔧 Li Auto LDM Remote Diagnosis — Required Equipment & Preparation
To allow us to perform remote LDM diagnostics and fault analysis for your Li Auto vehicle, please prepare the following:
① OBD BMW ENET Diagnostic Cable (OBD → Ethernet)
This cable connects the vehicle’s OBD port to a computer network port and is essential for LDM diagnostics.
Multilingual description:
- Chinese: OBD宝马 ENET 线
- English: OBD BMW ENET Cable
- Russian: OBD кабель ENET для BMW
② A Windows Computer With USB-C or USB Network Adapter
Your computer should have:
- Windows OS
- USB-C or USB-to-RJ45 network adapter (e.g., UGREEN USB network adapter)
Multilingual description:
- Chinese: C口电脑 + USB 转接网卡
- English: A computer with a USB-C port and a USB network adapter
- Russian: Компьютер с USB-C и USB-сетевым адаптером
③ Download ToDesk Remote Software (Free)
To allow our engineers to perform remote LDM diagnostics, please install:
Multilingual description:
- Chinese: 准备 Windows 电脑并下载 ToDesk 远程软件
- English: Prepare a Windows computer and download the ToDesk remote software
- Russian: Подготовьте Windows-компьютер и скачайте программу удалённого доступа ToDesk
After installation, please provide:
- ToDesk Device ID
- One-time password
We can then begin remote diagnostics.
LEO — About Chinese Cars 
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