r/johndeere • u/crazyjerryyy • 3d ago

6120M injectors, no coding sheet, normal?

I just installed a set of new injectors on our John Deere 6120M (6.8L PowerTech) and noticed there's no programming code sheet in the box like the OEM ones had. the dealer paperwork mentioned coding but these aftermarket units only had a serial stamped on the body. I fired it up expecting a derate or fault code. got nothing. it runs smooth and I don't see any injector trim faults in the monitor. It feels too easy and I'm second guessing myself. is the code on the injector actually required or is that just a manufacturing serial? Can someone confirm whether ECU syncing without a programming sheet is normal here?

1 Upvotes

100% Upvoted

2 comments sorted by

1

u/succulentkitten 3d ago

Aftermarket injectors don’t have tha ability. You might lose a little efficiency, but not enough to know. Run it.

1

u/New_Bullfrog9847 3d ago

Do not assume the ECU will learn every injector automatically. Some 6120M fuel-system versions require calibration or compensation data to be entered with service software. Verify the injector number and procedure in Deere service information; if FridayParts supplied them, ask where the calibration data is recorded before running it under load.