Remote ECU tune · 6.6L Duramax L5P V8 turbo-diesel
A custom Stage 1, 2 or 3 calibration for your Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P, built by hand by a real tuner from your own stock file and datalog, and back with you within three hours of the file arriving. We tune these cars remotely, worldwide: you read and flash with your own HP Tuners interface, and you pay only once the tune is delivered.
Stock vs tuned
From the factory the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P makes 445 hp and 910 lb-ft (1,234 Nm). A Stage 1 tune typically adds 60–130 hp and 111–291 lb-ft, for around 505–575 hp in total. With bolt-ons and a Stage 2 calibration that grows to +80–150 hp, and a Stage 3 build — upgraded turbo — typically lands at 590–690 hp.
| Stage | Added power | Added torque | Total power | Total torque |
|---|---|---|---|---|
| Stock | — | — | 445 hp | 910 lb-ft (1,234 Nm) |
| Stage 1 | +60–130 hp | +111–291 lb-ft (+150–395 Nm) | 505–575 hp | 1,021–1,202 lb-ft (1,384–1,629 Nm) |
| Stage 2 | +80–150 hp | +140–317 lb-ft (+190–430 Nm) | 525–595 hp | 1,050–1,227 lb-ft (1,424–1,664 Nm) |
| Stage 3 | +145–245 hp | +251–369 lb-ft (+340–500 Nm) | 590–690 hp | 1,161–1,279 lb-ft (1,574–1,734 Nm) |
Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
Tuner's notes
The L5P ECM has to be unlocked before it can be flashed.
Supported versions
HP Tuners lists 4 Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P entries covering 2017–2026, with 6.6-litre engines, diesel versions included. Interface: MPVI3/4 for some years.
| Years | Make | Model / engine as HP Tuners lists it | Controller | Credits | Interface |
|---|---|---|---|---|---|
| 2017–2023 | Chevrolet | Silverado 6.6 Duramax (Diesel) (L5P) | Engine | 4 | MPVI2/2+/3/4 |
| 2017–2023 | GMC | Sierra 6.6 Duramax (Diesel) (L5P) | Engine | 4 | MPVI2/2+/3/4 |
| 2024–2026 | Chevrolet | Silverado 2500/3500 6.6 Duramax (Diesel) (Global B – L5P) | Engine | 8 | MPVI3/4 |
| 2024–2026 | GMC | Sierra 2500/3500 6.6 Duramax (Diesel) (Global B – L5P) | Engine | 8 | MPVI3/4 |
Support data per HP Tuners' supported-vehicle list (June 2026). Check your exact car on HP Tuners' vehicle list before you buy credits.
Stages & prices
One flat price per stage, the same for every car: $250 for Stage 1, $450 for Stage 2 and $650 for Stage 3. Ordering is free and you pay only once the finished tune is delivered. 2 free revisions are included with every order. Gearbox (TCM) shift tuning is included wherever your car's transmission controller can be accessed.
Software only. Every map in the engine ECM is recalibrated for the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P as it sits today — spark, fuelling, throttle response and limiters — against the datalog you send.
For a Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P with bolt-ons fitted — intake, exhaust, headers or downpipe, and an intercooler where the car has one. The airflow and fuelling are rebuilt around the hardware you actually have.
Stage 3 on the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P means upgraded turbo. The fuel, spark and boost maps are written from scratch for your exact combination.
Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
Before you order
How it works
FAQ
Typically 60–130 hp and 111–291 lb-ft (150–395 Nm) over the stock 445 hp, for around 505–575 hp in total. Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
An HP Tuners interface (we recommend the MPVI4), the HP Tuners credits needed to license the engine ECM for writing, and your stock file plus a datalog of a drive. You read and flash the car yourself; we build the calibration.
Your custom tune is delivered within three hours of your stock file arriving. Six tuners work three shifts, so a file that lands in the middle of the night is picked up just as fast.
Stage 1 is $250, Stage 2 is $450 and Stage 3 is $650, flat. Ordering is free and you pay only once the finished tune is delivered. 2 free revisions are included with every order.
Stage 3 on the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax L5P means upgraded turbo. The maps are written from scratch for your build, and typical results are 145–245 hp over stock. Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
