DiabloSport Unlocked Replacement PCM for 2021-2022 Ram 1500 5.7L HEMI - PCM-DR578S21

The DiabloSport PCM-DR578S21 is an unlocked replacement powertrain control module for the 2021-2022 Ram 1500 with the 5.7L HEMI (non-eTorque). The factory module on these trucks is locked; this one is unlocked and programmed for your vehicle so a DiabloSport inTune i3 or Trinity 2 can flash a tune. On its own it changes nothing.

Buy it if you already own an inTune i3 or Trinity 2 from another vehicle, want a second PCM so you can swap back to stock for dealer service, or need a vehicle license on a new truck. If you need the tuner too, the inTune i3 PCM swap kit 8322-X and Trinity 2 EX PCM swap kit 9322-X bundle the device with the PCM cross-ship.

Vehicle compatibility

• 2021-2022 Ram 1500 with the 5.7L HEMI and 8-speed automatic, non-eTorque
• eTorque trucks use the PCM-DR57ET21; check your build sheet or the eTorque badge before ordering
• Works only with DiabloSport inTune i3 and Trinity 2 tuners

What you get

• Unlocked for DiabloSport inTune i3 and Trinity 2
• Programmed for your vehicle; your VIN goes on the DiabloSport PCM form that accompanies the module, not in the checkout notes
• Direct replacement for the factory PCM with the factory software loaded
• Removal and installation videos are on DiabloSport's YouTube channel

Installation and limitations

Before you remove the factory PCM, save the stock calibration with your DiabloSport tuner. The instructions packed with the unlocked PCM walk through it; skipping this step can leave you without a stock file to return to. Swapping the PCM may set a trouble code that does not show on the dash. Not for use in California.

Specifications

• Part number: PCM-DR578S21
• Brand: DiabloSport
• Emissions: Not legal for sale or use in California
• Warranty: 1 year manufacturer warranty
• Country of origin: United States
• Packaged size: 12 x 6 x 6 in, 4 lb
• UPC: 810065212115

Frequently asked questions

Do I still need a tuner?

Yes. This is the unlocked module only. To load a tune you need an inTune i3 or Trinity 2. The 8322-X and 9322-X kits include the device.

Will it work with HP Tuners or another brand?

No. DiabloSport unlocked PCMs are matched to DiabloSport devices only.

How does DiabloSport get my VIN?

Through the DiabloSport PCM form that comes with the module. Fill it in with the VIN and return it with the PCM paperwork; nothing is needed at checkout.

Does it fit the eTorque 5.7L?

No. This part number is for the non-eTorque 5.7L. The eTorque module is PCM-DR57ET21.

Why save the stock calibration first?

On 2021 and newer trucks the stock file has to be read from the original PCM before it is removed. Without it there is no stock calibration to return to later.