Select your Duramax year:
ecmsync™ Pro Software Guide
Select a selection below to jump to detailed instructions with visual guides.
🚀 Getting Started
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- Software Installation
- System Requirements
- Safety Percautions
System Requirements & Setup Guide:
Essential Requirements:
- Windows® operating system (Windows 10 or newer recommended)
- Stable internet connection
- ecmsync™ device and appropriate cables
- Battery maintainer/charger
- Indoor workspace with adequate clearance
Compatible Operating Systems:
Recommended:
- Windows® 10 or newer
- Windows® 11
Limited Support:
- Windows® 8 (Compatibility Mode)
IMPORTANT: macOS® and Linux® operating systems are not supported.
Hardware Requirements & Connection Types:
2017-2023 GM Duramax vehicles:
- OBDii Cable
- Pigtail (for the fuse connection)
Workspace Requirements:
SAFETY CHECKLIST:
Required Equipment:
Essential Tools:
- Battery maintainer/charger
- Laptop power supply
- Basic hand tools for battery/ECM access
- Safety gloves
- ecmsync™ device
- Model-specific cables (see connection guide above)
Installation Process:
Software Size: 83 MB
Step-by-Step Installation:
- Download the installer from this page here
- Run the installer package
⚠️ Critical Safety Warnings:
VOLTAGE STABILITY REQUIREMENTS:
- Maintain constant battery voltage using battery maintainer
- Keep laptop connected to power supply
- Ensure stable internet connection
- DO NOT change status of doors/windows/hood during programming
WARNING: Loss of power or connectivity during programming may result in ECM failure.
Version Information:
- Current Software Version: ES-R-D1-U2-4.0L
- Supports GM Duramax vehicles 2017-2023
- Updates available at ecmsync.com/pages/download-ecmsync-pro
Version Information:
For technical assistance:
- Contact your authorized ecmsync™ vendor
- Review our FAQ page
Developed by ecmsync Corp. All trademarks are property of their respective owners.
🔌 Physical Connections
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- Computer Setup
- Vehicle Connection
- Common Connection Issues
Cable Identification and Setup
Provided Cables
Computer Connection Cable
- USB Type-A to USB Type-B cable
- Connects ecmsync™ device to computer
Vehicle Connection Cables
- OBDii Cable
- Pigtail (for the fuse connection)
2017-2023 GM Duramax:
Connection Procedures by Model Year
2020-2023 GM Duramax
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If not already connected, connect the pigtail end to the OBDii end.
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Remove the fuse box within the engine bay.
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Remove the ECM (15A) fuse 78 from the fuse box.
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Insert the pigtail blade into the fuse slot closer to the driver side wheel.
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Connect the OBDii cable under the drivers side dash.
- Connect white serial connector to ecmsync™ device "Vehicle" port
- Connect USB cable to "Computer" port on device
⚠️ Critical Warning: If for any reason you disconnect the ecmsync™ device from the computer, please restart the ecmsync™ software when reconnecting the device.
🚗 Vehicle Selection & Unlock
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- Vehicle Selection Process
- Selection Parameters
- Available Configurations
Software Connection Sequence
- Launch ecmsync™ Pro Software
- Complete EULA acceptance (full scroll required)
- Select either Guided Mode or Pro Mode. Guided mode has detailed instructions for first time users. Pro mode for experienced users with hidden instructions.
- Wait for initialization
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Vehicle Selection:
- Make: GM Duramax
- Year: Select applicable year
- Body: Choose Pickup or Cab & Chassis
- Module: Select ECM or TCM
- Confirm selection (two-step verification)
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Connect device (Device Block)
- Successful connection shows serial number
- # of segments found
- VIN Number (only for ECM)
- Button turns red, displays "Disconnect"
- Connect vehicle (Vehicle Block)
NOTE: The instructions can be opened by selecting the Show/Hide instructions button on the top-right hand corner of the program.
Connection Verification
ECM Module:
- VIN populated
- Module number displayed
- Serial number displayed
TCM Module:
- Module number displayed
- Serial number displayed
- Note: VIN will not populate
Status Indicators
Top-Right Icons:
- ⚪ White: Powered on & ready to connect
- 🟢 Green: Connection successful
- 🔴 Red: Disconnected
⚠️ CRITICAL SAFETY NOTES:
- Follow connection sequence exactly as specified
- Never force connectors
- Verify battery maintainer connection before proceeding
- Ensure stable power supply throughout process
- If in doubt, contact authorized vendor support
Common Connection Issues
- Failed OBD-II terminal connection
- Incorrect cable disconnection sequence
- Insufficient battery charge
- Improper cable seating
For detailed troubleshooting steps, refer to your authorized ecmsync™ vendor.
Developed by ecmsync Corp. All trademarks are property of their respective owners.
L5P Unlock Procedure
Once the vehicle is connected, a popup stating the status of your ECU appears.
- If the ECU is locked, the software will ask you to unlock this ECU (steps are below).
- If the ECU is unlocked, it will direct you to either create an ecmsync file, or select that you have an ecmsync file.
For unlocking an ECU, please follow the steps below:
- Click Yes on the "This GM ECU" is currently locked" popup.
- Check off the "I understand and accept the risks involved in this ECU"
- Click the green "Unlock ECU" button
- The unlock process can take several minutes to start, and will take roughly 30 minutes to complete.
📄 File Generation
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- File Generation & Management
- Understanding ecmsync™ Files
Configuration Files (.ecma)
- Generated unique to each device and session
- Contains device-specific security information
- Required for creating tune files
- Single-use files that expire after successful write
Tune Files (.ECMT)
- Encrypted tune files for vehicle programming
- Generated by authorized vendors using your .ecma file
- Specific to each programming session
Generating Configuration Files
Method 1: Quick Access:
- Press Ctrl + S
- Select desktop as save location
- File automatically named: [DeviceSerialNumber]_config.ecma
Method 2: Menu Navigation:
- Click "Menu"
- Select "Device"
- Choose "Save Configuration"
Method 3: Direct Button:
- Click "I need to Generate an ecmsync™ File" button
- Follow save location prompt
⚠️ IMPORTANT: Configuration files must be regenerated for each programming session. Previous files cannot be reused.
File Handling Best Practices
Save Location:
- Recommended:
- Desktop folder
- Downloads folder
Why?
- Easy accessibility
- Prevents lost files
- Quick transfer to vendors
File Verification:
- Check file size:
- Valid files: Above 1KB
- Invalid files: 0KB or 1KB
If file size is invalid:
- Disconnect device
- Reconnect device
Working with Vendors
- Sending Files to Vendors:
- Generate fresh .ecma file
- Verify file size
- Send to authorized vendor
- Await .ECMT file return
Receiving .ECMT Files:
- Save received file to desktop
- Keep file easily accessible
- Use file only with matching configuration
Critical Reminders
⚠️ REGENERATION REQUIREMENTS:
- New config file needed after each ECU write
- Fresh config required after any error
- New config needed for each upgrade
- Previous files become invalid after use
Troubleshooting
Invalid File Indicators:
- File size 0KB or 1KB
- Error during generation
- Failed verification
Resolution Steps:
- Disconnect all devices
- Close software
- Reconnect devices
- Regenerate configuration file
- Verify file size
- Proceed with programming
Best Practices Summary:
🔃 Sync Process
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- Vehicle Sync Process
⚠️ CRITICAL SAFETY REQUIREMENTS
| Requirement | Status | Note |
|---|---|---|
| Ignition | ON | Must remain ON throughout process |
| Engine | OFF | Must remain OFF throughout process |
| Battery Voltage | >12V | Maintain with battery charger |
| Device Connection | STABLE | DO NOT disconnect during sync |
| Vehicle Condition | STATIC | DO NOT alter door/window positions |
Pre-Sync Checklist:
WARNING: Once sync begins, vehicle status (doors, windows, electronics) must remain unchanged until process completes.
Sync Process
Phase 1: File Loading:
- Select .ECMT file using "Browse" button
- Click "Load File to device"
- Wait for file loading (up to 5 minutes)
- Progress indicator will show status
- Do not interrupt process
Phase 2: Active Sync:
- Click "Ready to Sync" button
- The file warning before the sync process will pop up. Please read all points and click the "I understand" button
- Wait for progress to initiate
- Progress meter will begin at 0%
- Status messages will update regularly
DURING SYNC (up to 30 minutes):
- Maintain complete vehicle stability
- Do not touch vehicle
- Monitor progress indicator
- Watch for status messages
- ⚠️ DO NOT:
- Touch the vehicle
- Open/close doors
- Adjust windows
- Change vehicle power state
- Disconnect any cables
- Close software
- Sleep/shut down computer
Phase 3: Completion & Verification:
- Wait for "Finishing up" message
- Follow prompt to click "Disconnect"
- Click "Reconnect and Verify"
- Observe 10-second countdown
- Verify repopulation of:
- Module number
- Serial number
- VIN (except TCM)
Phase 4: Key Regeneration:
- Respond to key regeneration prompt - you can either disconnect your vehicle now, or regenerate your keys for the next use. We recommend completeting the key generation process right away so there are no delays the next time you want to use the device.
- Wait for process completion (up to 4 minutes)
- Follow disconnection prompts:
- Disconnect vehicle in software
- Disconnect device in software
Status Indicators
Normal Progress Signs:
- Steady progress bar advancement
- Regular status updates
- Green connection indicators
Warning Signs:
- Stalled progress
- Error messages
- Connection warnings
- Voltage warnings
Emergency Procedures:
If any critical issues occur:
- Do not panic
- Do not force-close software
- Do not disconnect devices
- Contact authorized vendor immediately
For optimal results, complete all steps in sequence without interruption. Process requires approximately 35-40 minutes total completion time.
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