Questions
Do I need my own HP Tuners interface?
Yes. An MPVI2, MPVI2+, MPVI3 or MPVI4 with your vehicle licensed on it — a few newer trucks need an MPVI3 or MPVI4, and GM Global B vehicles need an MPVI4. We only ever touch the file; the reading, the license credits and the write are all yours, which is also why you never have to ship anything or leave the truck anywhere.
Does my truck need an unlock first?
Some do. HP Tuners requires a one-time module upgrade on certain newer controllers before they'll take a tune: a send-in service for 2015+ Ram/Dodge gas PCMs, 2022–2024 Ram Cummins ECMs and GM Global B transmissions, or a Direct OBDII upgrade you do yourself for GM T93 transmissions on Global A vehicles. Most GM 2017–2019 trucks and every Ford on our list need nothing. The order form checks your platform and model year and tells you before you pay; the full list is on the what-your-truck-needs page.
Can you do the unlock for me?
The module has to physically go to HP Tuners, so the shipping is on your end — but we'll send you removal and relearn notes for your truck. For 2022–2024 Ram Cummins there's a no-shipping option through an authorized HP Tuners reseller; email us and we'll point you to one.
If I only want the transmission tuned, do I still need the engine unlock?
Depends on where the transmission tables live. On Ram Cummins (2010+) and Ram Hemi HD trucks the transmission is controlled inside the engine ECM or PCM, so yes — the ECM/PCM upgrade is required even for transmission-only work. On GM 8/9/10-speeds, Allisons and every Ford on the list the transmission has its own module that licenses separately, so no engine-side service is needed.
Does my interface need to be plugged in while you tune?
No. Tuning is file-based: you read the truck, send us the .hpt, we edit it, you write it. Your interface is only needed at the truck — to read, to license, to write, and to run any Direct OBDII upgrade the first time.
How fast is one business hour, really?
Orders placed between 8 am and 6 pm Central, Monday through Saturday, are delivered within 60 minutes of payment. Anything after hours is first in the queue the next morning. Your order page shows the promised time the moment you pay.
Will it throw codes or hurt my warranty?
The tables we change don't set codes on a healthy transmission. Any calibration change can affect your factory warranty, and a dealer can see that a vehicle has been tuned — we don't hide that from you. Keep your stock file; we send it back to you with every order.
Is this an emissions thing?
No. We work in transmission and driveability tables only. We don't modify or disable emissions equipment or its diagnostics, on gas or diesel, and we won't take orders asking us to.
What if I don't like how it drives?
Tell us what you feel and send a log. One revision is included for 30 days and we keep revising until it's right. Delivered files aren't refundable — they're digital goods — so the guarantee is the revision, not the refund.
What's in a log and how do I take one?
VCM Scanner, channel list we send you with the file: gear, commanded gear, TCC slip, trans temp, throttle, engine torque, and shift time. A 15-minute drive with a few full-throttle pulls is plenty.
I have a built transmission or an aftermarket converter.
Good — say so on the order form with the stall speed and what's been done. Converter stall and clutch pack changes change what the right numbers are.
What happens to my file?
It's stored for 90 days so we can do revisions, then deleted. It's never shared, sold or reused for anyone else's vehicle.