Within 2 seconds, press the pedal all the way down and release.
If you are intentionally in this mode to find other codes, you can navigate using the machine's controls: How to retrieve codes on a John Deere 6420, 6000 series john deere d1a code
Immediately press the pedal all the way down and release. Within 2 seconds, press the pedal all the
If your tractor is stuck in this mode and won't move (often disabling the forward/reverse lever), it usually means a diagnostic fuse was accidentally inserted or a wiring short is tricking the system into "thinking" it should be in diagnostic mode. Common Causes for d1A Appearing Unexpectedly Within 2 seconds