JOHN DEERE · L21 ECU

JOHN DEERE T550 L21 tuning files

The JOHN DEERE T550 on the L21, mapped from stock file to finished result. Across the matched variants stock power runs from 305 to 305 HP. 2 distinct variants are catalogued here. We start conservative here — Stage 1 and Stage 2 are the dependable baseline. We match the right calibration to your exact software and validate it before delivery.

Upload your file →All T550 coverage

Available solutions

Solutions that apply to the L21 on this vehicle platform. The exact set depends on the specific engine and software version.

Stage 1 Stage 2

Engine variants & ECU software

2 distinct variants for the JOHN DEERE T550 on the L21 ECU. Reference the engine and controller software when you upload.

Variant 1

ECU

Catalog engine: 6800 305HP
Controller brand: PHOENIX
ECU: L21
Stock power: 305 HP

Variant 2

ECU

Catalog engine: 6800 305HP
Engine code: 6068HZ490
Controller brand: PHOENIX
ECU: L21
Stock power: 305 HP
ECU SW: SW61510C
ECU HW: RE551415

Related vehicles

Other vehicles built on the L21 controller or the same engine — handy when a platform spans several models and makes.

Questions, answered.

Which tuning solutions are available for the JOHN DEERE T550 on the L21?

Stage 1, Stage 2. The exact set depends on the specific engine and software version.

Do you cover the L21 ECU software on this model?

Yes — the JOHN DEERE T550 on the L21 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.