GM L5P/L5D Shift on the Fly

Modified on Thu, 26 Oct 2023 at 08:49 AM

We are proud to introduce “Switch on the Fly” (SOTF), the world’s first integrated ECM map switching
solution for GM L5D/L5P applications! This feature has been designed to work seamlessly with your vehicle
as if it were included from the factory. Follow these simple instructions to configure the feature on your
calibration and learn how to utilize the switching interface


See the attached guide for setting up and utilizing SOTF (Shift on the Fly) for your L5P or L5D equipped vehicles. 


Q: Can I use this feature with an aftermarket steering wheel?
A: Yes! This feature is available when using the HPT Diesel Switch.
Q: I forgot what slot I’m currently in, how can I tell which slot is active?
A: Use VCM Scanner to monitor the “Active Slot” parameter or press the “Coast” button.
Q: I made a bunch of calibration changes, but nothing seems to change when I switch slots?
A: Make sure that each set of SOTF tables has the SOTF Enable set to “OEM+SOTF”.
Q: I set my Default Slot to 4 but when I start the car it is Slot 0, what’s going on?
A: If the Default Slot is greater than the Max Allowed Slots it will default to Slot 0.
Q: I shut off the car in Slot 3, and when I started it back up the Active Slot was 3! How did that happen?
A: We thought it’d be cool if this feature remembered your previous slot and restored it for you on startup.
Q: I’ve tried everything, I just can’t get this to work! Can you tell me what I’m doing wrong?
A: Yes! Contact us at to proceed with diagnosing the cause.
Q: Will this work in my (insert currently unsupported application here)?
A: We will be adding more applications based on demand and availability!

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