2017 Ram 1500, 5.7 Ltr.

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BlackGold6.4

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Your pre-trailer info telling you that you have disconnected the trailer. When you are towing do you input the trailer info, on mine I have something like 3 trailer weights I can pre-program.. but with that said , I have never seen a no trailer indicator light on my dash.
 

14hemiexpress

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If you plug a trailer in and then unhook it you’ll get that message until you shut the truck off and turn it back on again. If you happen to not feel you’re self lose a trailer it’ll show up on you’re dash. If that showed up and never hooked up a trailer/lights probably should get it checked out.

Edit page 242 of the 2017 owners manual
 

crash68

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^^^ what he stated
It's a "loss of trailer brakes" notification. When a trailer with brakes is disconnected or a problem is detected with the trailer brakes that icon will illuminate until the truck is turned off.
 
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