Variant 1
ECU- Catalog engine
- 4500 125HP
- Engine code
- 4045HL495
- Controller brand
- PHOENIX
- ECU
- L21
- Stock power
- 125 HP
- ECU SW
- SW62075C
- ECU HW
- RE558737
JOHN DEERE · L21 ECU
JOHN DEERE 6125 L21 tuning files
The JOHN DEERE 6125 on the L21, mapped from stock file to finished result. The matched variants sit between 125 and 125 HP from the factory. There are 5 distinct variants on file for this combination. For this platform the dependable path begins with Stage 1 and Stage 2. Every file is matched to the exact calibration on your vehicle and signed off by an operator.
Available solutions
Solutions that apply to the L21 on this vehicle platform. The exact set depends on the specific engine and software version.
Engine variants & ECU software
5 distinct variants for the JOHN DEERE 6125 on the L21 ECU. Reference the engine and controller software when you upload.
Variant 2
ECU- Catalog engine
- 4500 125HP
- Controller brand
- PHOENIX
- ECU
- L21
- Stock power
- 125 HP
Variant 3
ECU- Catalog engine
- 4500 125HP
- Engine code
- 4045HL495
- Controller brand
- PHOENIX
- ECU
- L21
- Stock power
- 125 HP
- ECU SW
- SW62075D
- ECU HW
- RE551416
Variant 4
ECU- Catalog engine
- 4500 125HP
- Engine code
- 4045HL495
- Controller brand
- PHOENIX
- ECU
- L21
- Stock power
- 125 HP
- ECU SW
- SW62075B
- ECU HW
- RE551416
Variant 5
ECU- Catalog engine
- 4500 125HP
- Engine code
- 4045HL495
- Controller brand
- PHOENIX
- ECU
- L21
- Stock power
- 125 HP
- ECU SW
- SW62075D
- ECU HW
- RE543423
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 6125 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 6125 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.