Are you experiencing speedometer inaccuracies in your 2013 Ram 2500 after changing tire sizes? It’s a common issue, and fortunately, recalibrating your speedometer is now something you can easily handle yourself. Forget expensive trips to the dealership for simple programming adjustments. With the right tools and software, you can achieve dealer-level customization right in your driveway. This guide will walk you through how to use the OBDLink MX and AlfaOBD software to calibrate your speedometer on your 2013-2018 Ram 2500, ensuring accurate readings and optimizing your truck’s performance.
For 2013-2018 Ram 2500 models, the power to customize your vehicle’s settings is more accessible than ever. Traditionally, modifications like speedometer calibration were dealer-exclusive services. However, thanks to innovative tools like AlfaOBD software and OBD2 scanners such as the OBDLink MX, you can now perform these adjustments yourself. This combination provides a user-friendly and cost-effective way to fine-tune various aspects of your Ram 2500, going beyond just speedometer corrections.
What You Need for Speedometer Calibration
To get started with calibrating your 2013 Ram 2500 speedometer, you’ll need a few key components. These tools are not only effective for speedometer adjustments but also unlock a wide range of customization options for your truck.
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AlfaOBD Software: This powerful software is the heart of the operation. It’s available for Android and Windows devices, offering dealer-level diagnostic and programming capabilities for FCA group vehicles, including Ram trucks. You can find AlfaOBD on platforms like the Google Play Store or the AlfaOBD website for Windows. Important Note: AlfaOBD is not compatible with iOS (Apple) devices.
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OBDLink MX or MX+ OBD2 Scanner: This OBD2 adapter serves as the communication bridge between your vehicle’s computer system and your Android or Windows device running AlfaOBD. The OBDLink MX and MX+ are recommended for their reliable performance and compatibility with AlfaOBD. While cheaper OBD2 scanners exist, their compatibility and performance with AlfaOBD and Ram trucks can be inconsistent. You can purchase the OBDLink MX from online retailers like Amazon.
While the OBDLink MX+ is also compatible with iOS for basic diagnostics and gauges, remember that AlfaOBD, which is required for programming, is not available on iOS. Therefore, for speedometer calibration and other programming tasks, an Android or Windows device is necessary.
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Android or Windows Device: As mentioned, you’ll need an Android phone or tablet, or a Windows laptop or tablet to run the AlfaOBD software. If you don’t own one, borrowing one or purchasing an affordable Android device specifically for this purpose can be a worthwhile investment, considering the capabilities AlfaOBD unlocks.
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Dealer PIN (for certain functions): For some modifications, including tire size and TPMS settings, you will need a 4-digit PIN code from your Ram dealership. This PIN is usually provided free of charge. Visit the parts department of your local Ram dealer with your vehicle registration and driver’s license to request your PIN. Ensure you request the 4-digit PIN, as a 5-digit PIN is not compatible with AlfaOBD for these functions.
An OBDLink MX OBD2 scanner, essential for connecting your 2013 Ram 2500 to AlfaOBD software for speedometer calibration and other customizations.
Step-by-Step Speedometer Calibration with AlfaOBD
Once you have gathered all the necessary tools, you can proceed with the speedometer calibration. Here’s a general outline of the steps involved:
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Install AlfaOBD: Download and install the AlfaOBD software on your Android or Windows device.
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Connect OBDLink MX: Plug the OBDLink MX scanner into your Ram 2500’s OBD2 port, typically located under the dashboard on the driver’s side.
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Establish Connection: Turn your vehicle’s ignition to the “Run” position (engine off). Launch AlfaOBD on your device and establish a connection to your vehicle using the OBDLink MX adapter. Follow the software prompts to select your vehicle model and engine type.
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Navigate to Speedometer Calibration Settings: Within AlfaOBD, navigate to the “Body Computer” or “PCM (Powertrain Control Module)” section, depending on your specific Ram 2500 model year and AlfaOBD version. Look for options related to “Speedometer Calibration,” “Tire Size,” or “Gear Ratio.” The exact menu names may vary slightly.
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Enter New Tire Size or Parameters: AlfaOBD will typically allow you to enter your new tire size in millimeters (diameter) or select from a list of standard tire sizes. Alternatively, you might be able to input gear ratio changes if applicable. Refer to tire size calculators online to determine the correct diameter in millimeters for your new tires if needed.
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Enter Dealer PIN (if prompted): If AlfaOBD prompts you for a PIN during the calibration process, enter the 4-digit PIN you obtained from your Ram dealership. This is often required for security-sensitive modifications like speedometer and TPMS adjustments.
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Perform Calibration: Initiate the speedometer calibration procedure within AlfaOBD. The software will communicate with your Ram 2500’s computer to update the necessary parameters. Follow the on-screen instructions carefully and wait for the process to complete.
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Verify Calibration: After the calibration is complete, test drive your Ram 2500 to verify the speedometer accuracy. Use a GPS-based speedometer app on your smartphone or a standalone GPS device to compare your truck’s speedometer reading against the GPS speed. Make further adjustments in AlfaOBD if necessary to fine-tune the calibration.
AlfaOBD Software Interface
Beyond Speedometer Calibration: Unlocking Your Ram 2500’s Potential
The combination of AlfaOBD and OBDLink MX extends far beyond just speedometer calibration. Once you have these tools, you can access and modify a wide array of settings on your 2013-2018 Ram 2500. Some popular customizations include:
- TPMS Threshold Adjustment: Modify the Tire Pressure Monitoring System (TPMS) warning thresholds, especially useful if you frequently adjust tire pressures for off-roading or towing.
- Enable/Disable Factory Options: Add or remove factory options like backup cameras, heated seats, and fog lights, even if they were not originally installed on your truck.
- Lighting Modifications: Configure your truck’s lighting system to accommodate LED bulbs without error codes, enable fog lights to stay on with high beams, and customize other lighting behaviors.
- Mirror Tilt in Reverse: Activate or deactivate the mirror tilt feature when reversing.
- And Much More: The extensive list of configurable parameters includes options for various comfort, convenience, and performance settings. Refer to online forums and AlfaOBD documentation for a comprehensive list of available modifications for your specific Ram 2500 model year.
Conclusion
Calibrating your 2013 Ram 2500 speedometer after changing tire sizes is easily achievable with the AlfaOBD software and an OBDLink MX scanner. This DIY approach not only saves you money compared to dealership services but also empowers you with dealer-level control over your vehicle’s settings. Beyond speedometer correction, this powerful combination unlocks a world of customization options for your Ram 2500, allowing you to tailor your truck to your exact preferences and needs. Take control of your truck’s programming and experience the full potential of your 2013-2018 Ram 2500.
