caterpillar warning symbols and meanings

The first time I saw the DEF warning, I thought the machine was about to shut down for good. I’m new here too, but I’m already learning a ton from these replies. I might have to make one of those cheat sheets myself!
 
totally feel you some of those symbols look like hieroglyphics...I keep a quick cheat sheet in the cab now and yeah its a lifesaver
 
some of those cat warning symbols really do keep you guessing :LOL:

has anyone ever had one pop up mid-job that turned out to be something completely different than you thought?
 
On newer machines, that’s your DPF (Diesel Particulate Filter) screaming for a regen (regeneration). If you keep pushing, the machine will eventually go into a forced shutdown mode and refuse to work until it runs its little cleaning cycle. It's the most annoying time-waster ever.
 
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