GMC Sierra HD (2500 / 3500) T1XX HD
T1XX-HD 2020 – … pickup 3 engines
Engines
| Engine | Code | Fuel | cc | kW | hp | Nm | Years | ECU / TCU | Stage 1 |
|---|---|---|---|---|---|---|---|---|---|
| 6.6 Duramax L5P 445 | L5P | Diesel | 6 599 | 332 | 445 | 1234 | 2020 – 2023 | 520 hp · 1400 Nm | |
| 6.6 Duramax L5P 470 | L5P-470 | Diesel | 6 599 | 350 | 470 | 1322 | 2024 – … | — | |
| 6.6 V8 L8T 401 | L8T | Petrol | 6 571 | 299 | 401 | 629 | 2020 – … | — |
Figures are typical factory values; the ECU/TCU depends on the exact production date and market. Always identify the unit from the original read before ordering.