There have been several questions by members regarding error codes. Iíve found that the John Deere TractorPlus app that is available in the Apple App Store and on Google Play has an error code lookup function. Once installed on your phone, you set it up with your tractor model, loader, backhoe, transmission and station, open or cab.
The app has a tractor setup section which is a basic manual, a safety section, icon glossary, error code lookup and a notes section. I had hoped the app would allow record keeping of hours and maintenance but it does not. At least not yet.
The error code lookup seems to be the most usable function. Hopefully others will find it useful too.