The tractor has entered a diagnostic state where the operator's controls are being tested.
If you see (often appearing as "diA" ) on your John Deere tractor or equipment display, it generally means the machine has entered Diagnostic Mode . john deere d1a code
Look inside the plugs for bent pins, moisture, or corrosion. The tractor has entered a diagnostic state where
Use a smart battery tender during seasonal storage to prevent deep discharges that degrade battery health and confuse electronic modules upon spring startup. john deere d1a code