Variant 1
ECU- Catalog engine
- 6600 451HP
- Controller brand
- DELCO
- ECU
- E86
- Stock power
- 451 HP
- ECU SW
- 12667378
- ECU HW
- 12657305
GMC · E86 ECU
GMC SIERRA E86 tuning files
The GMC SIERRA on the E86, mapped from stock file to finished result. Across the matched variants stock power runs from 400 to 451 HP. There are 5 distinct variants on file for this combination. We start conservative here — Stage 1 and Stage 2 are the dependable baseline. Your file is built against the exact ECU software on the car, then operator-verified.
Available solutions
Applicable work for the E86 on this vehicle. The available set firms up once the exact engine and software are known.
Engine variants & ECU software
5 distinct variants for the GMC SIERRA on the E86 ECU. Reference the engine and controller software when you upload.
Variant 2
ECU- Catalog engine
- 6600 451HP
- Controller brand
- DELCO
- ECU
- E86
- Stock power
- 451 HP
- ECU SW
- 12667378
- ECU HW
- 12657305
- Calibration
- E886B2FA7F6B461E
Variant 3
ECU- Catalog engine
- 6600 451HP
- Controller brand
- DELCO
- ECU
- E86
- Stock power
- 451 HP
- ECU SW
- 12649245
- ECU HW
- 12649331
- Calibration
- 85C3FFEE079793FF
Variant 4
ECU- Catalog engine
- 6600 V8 400HP
- Controller brand
- DELCO
- ECU
- E86
- Stock power
- 400 HP
- ECU SW
- 12646250
- ECU HW
- 12646251
- Calibration
- 636FF6228BF506CA
Variant 5
ECU- Catalog engine
- 6600 V8 400HP
- Controller brand
- DELCO
- ECU
- E86
- Stock power
- 400 HP
- ECU SW
- 12644095
- ECU HW
- 12644096
- Calibration
- 62A7AA84938A3FAE
Related vehicles
Other vehicles built on the E86 controller or the same engine — handy when a platform spans several models and makes.
Questions, answered.
Which tuning solutions are available for the GMC SIERRA on the E86?
Stage 1, Stage 2, Swirl Flaps Off, Lambda / O2, OPF/GPF Off. The exact set depends on the specific engine and software version.
Do you cover the E86 ECU software on this model?
Yes — the GMC SIERRA on the E86 ECU is part of the catalog. Upload your original file and it is matched to the right calibration before any work is done.
How is the file delivered?
Through the TuningBay workflow with operator validation and one safe, sensible result per job. Files we deliver, we stand behind.