RTD4 Remote Tuning Device & Custom Tune File for 2019-2023 6.6L Duramax L5P 2500HD 3500HD

Designed for remote vehicle tuning, the RTD4 works with the HP Tuners TDN App to read your vehicle's current calibration, submit tuning data, receive custom tune files, and flash updated calibrations directly to your vehicle. This complete tuning package gives you a streamlined solution for improving power delivery, enhancing throttle response, and tailoring your truck's performance to your driving needs. Every tune file included in this package supports 5-Level Switch-On-The-Fly (SOTF) tuning, allowing you to select from five available power levels. 

Key Features

1. Complete RTD4 Device & Tune File Package

SPELAB offer 2 Options for you:

Option 1: RTD4 Device+ECM Tune File Pacakge:

• RTD4 Device
• ECM Tune File
• 6 ECM Credits

Option 2: RTD4 Device+ECM+TCM Tune File Pacakge:

• RTD4 Device
• ECM Tune File
• TCM Tune File
• 6 ECM Credits+4 TCM Credits

ECM + TCM tuning can provide a more integrated driving experience by addressing both engine performance and transmission behavior.

2. ECM Tuning - 5-Level SOTF Performance Tuning

All tune files included in this package support 5-Level Switch-On-The-Fly (SOTF) tuning.

The power levels listed above are the default settings. If you have different power requirements, please contact us to discuss a customized tuning setup.

Note: Power figures are approximate tuning targets, not guaranteed dyno results. Actual performance may vary depending on vehicle condition, calibration, fuel quality, and supporting modifications. The SOTF switching method and configuration will be confirmed with your tuning package.

3. Custom Calibration for Your Vehicle

Every vehicle may have a different calibration, software version, and performance requirement. Your custom Tune File is developed based on the information and calibration data provided for your vehicle.

The tuning process includes:

• Reviewing your vehicle's current calibration

• Confirming the software version and tuning requirements

• Developing the custom calibration

• Checking file integrity before delivery

• Providing technical support for tuning-related questions

This vehicle-specific approach helps ensure the tuning solution matches your selected configuration and performance goals.

4 Tune File Support & 1-Year RTD4 Hardware Warranty

Your tuning package includes dedicated support for both the custom tune file and RTD4 hardware.

Tune File Support

• 30 days of reasonable tune file revisions after file delivery

• Revisions based on customer feedback or data logs

• Additional support for tuning-related issues

• Refund eligibility if a file issue remains unresolved after revisions within the applicable support terms

RTD4 Hardware Warranty

• 1-year limited hardware warranty

• Warranty service handled through the designated tuning provider

Please note that tune file support and RTD4 hardware warranty are separate services and are subject to their respective terms.

How RTD4 Works

Step 1 — Select Your Tuning Configuration

Choose between ECM Only and ECM + TCM tuning.

All available options include the RTD4 device and 5-Level SOTF Tune File(s).

Step 2 — Confirm Your Vehicle Information

Provide your VIN, model year, ECM/TCM information, existing modifications, and any relevant fault codes.

This information helps the tuning team confirm your vehicle's calibration requirements.

Step 3 — Connect the RTD4

Install the HP Tuners TDN App, complete the required account and device setup, and connect the RTD4 to your vehicle's OBD-II port.

Step 4 — Complete Module Preparation

Follow the provided instructions to complete any required ECM/TCM preparation or authorization.

For vehicles requiring E41 ECM OBD authorization or additional module preparation, the necessary steps must be completed before proceeding with tuning.

Step 5 — Read & Submit Your Current Calibration

Use the TDN App to read your vehicle's ECM or ECM/TCM calibration data and submit it for custom tune development.

Step 6 — Receive Your Custom Tune File

Your calibration data is reviewed, and the custom tune file is prepared according to your vehicle's software version and selected tuning requirements.

Files are typically delivered within 24 hours after the required calibration data is received. Complex custom requirements or special software versions may take longer.

Step 7 — Flash Your Vehicle

Follow the official instructions to write the custom calibration to your vehicle using the RTD4 and TDN App.

A suitable programming power supply is strongly recommended to maintain stable voltage throughout the flashing process.

Step 8 — Verify Vehicle Operation

After flashing, verify the programming result, check for fault codes, and confirm proper vehicle operation.

For SOTF tuning, verify the available power levels and switching functionality.

If any issues occur, collect the relevant fault codes, error messages, and data logs, then contact technical support for assistance.

• 2019–2023 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P Diesel

• 2019–2023 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P Diesel

• Tuning Options: Choose between ECM Only and ECM + TCM tuning. Both options include the RTD4 device and the corresponding custom tune file(s).

• SOTF Tuning: All tune files included in this listing support 5-Level Switch-On-The-Fly (SOTF) tuning. The available power levels are approximately +20 HP, +40 HP, +60 HP, +80 HP, and +100 HP.

• Authorized RTD4 Device: This RTD4 is configured for the designated tuning service. An RTD4 or MPVI4 device from another tuning provider cannot be substituted.

• Custom Tune File Preparation: Your custom calibration is developed based on your vehicle's current calibration data, software version, and confirmed tuning requirements. Please provide accurate vehicle information before ordering.

• ECM/TCM Preparation: Certain ECM/TCM configurations may require additional module preparation, OBD authorization, or unlocking before tuning. Please confirm your vehicle's requirements before proceeding.

• File Delivery: Custom tune files are typically delivered within 24 hours after the required calibration data is received. Complex tuning requirements or special software versions may require additional time.

• Stable Power Supply: A suitable battery maintainer or programming power supply is strongly recommended during the flashing process to help maintain stable vehicle voltage.

• Internet Connection: A stable internet connection is required for the remote tuning process through the HP Tuners TDN App.

• Vehicle Condition: Existing mechanical or electrical issues and fault codes should be diagnosed and resolved before tuning. Calibration should not be used to mask pre-existing vehicle problems.

• Custom Tune File Support: Reasonable tune file revisions are available within 30 days of file delivery based on customer feedback or data logs. If a file issue remains unresolved after revisions within the applicable support terms, a refund may be available.

• RTD4 Hardware Warranty: The RTD4 device includes a 1-year limited hardware warranty. Warranty service is handled through the designated tuning provider.

• Emissions Compliance: Vehicle tuning and emissions-related modifications must comply with applicable federal, state, and local regulations. This product is intended for use only where legally permitted.