GM 8L90 / 8L45 transmission tune
2015+ Silverado, Sierra, Tahoe, Yukon; Corvette, Camaro, CTS
What we change on this platform
Firmness without the harsh 1-2 the 8-speed is known for. Converter strategy set up around the fluid you're running — tell us if it's had the Mobil 1 Blue Label service. Shift points and tap-shift behavior.
What your truck needs first
By model year, from HP Tuners' current support list. This is the owner's side of the job — interface, licensing credits, and any one-time module upgrade.
| Model years | Module | Status | Interface | Credits |
|---|---|---|---|---|
| 2015–2016 | T87 TCM | Ready to tune No service. | MPVI2 or newer | 4 |
| 2017–2019 | T87A TCM | Ready to tune No unlock service needed since Nov 2025. | MPVI2 or newer | 4 |
| 2019–2024 (Global A) | T93 TCM | Direct OBDII upgrade first One-time Direct OBDII upgrade you do yourself in VCM Suite at the truck (since Mar 2026). No shipping. Pre-refresh Silverado/Sierra, Camaro, and most 2019–2021 trucks. | MPVI3 or MPVI4 | 4 |
| 2021+ Global B models | T93 TCM (Global B) | Send-in service first 2021+ Tahoe/Yukon/Escalade, 2022.5+ Silverado/Sierra 1500, Cadillac CT4/CT5: the TCM goes to HP Tuners for the Global B service (about $300–400, roughly two weeks) and needs an MPVI4. | MPVI4 | 4 |
What you send us
- A fresh read of the vehicle saved as a .hpt file, from a module that's already upgraded if yours needs it
- Your mod list, if anything's been changed: converter, gears, tires, lift, built unit
Price
$179 for the Transmission Tune, $249 with the driveability package. One business hour turnaround, one revision included.
Order the GM 8L90 / 8L45 tune