Once you've cleared the D1A and regained normal display functions, you'll likely need to address the original fault that may have triggered diagnostic mode. Here's a guide:
The antenna ring around the ignition switch reads the key’s chip. If this ring is cracked, corroded, or unplugged, it cannot read any key, leading to D1A 01. john deere d1a code
However, there are temporary workarounds for moving the machine to a repair location: Once you've cleared the D1A and regained normal
Resolving the "D1A" code is often very straightforward. However, you should ignore it if you suspect a real mechanical issue. it cannot read any key
If you're interested, I can help you find a local John Deere service center. Was this guide helpful? Troubleshooting - John Deere - Technical Information Store