2018 Peterbilt 579 warning light. Antifreeze is topped up still this warning not going away. what this could be?

11398

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823501

{"replyTo":"","text":"Bad low coolant sensor in the bottom of your coolant tank","replyToPid":0}

11398

{"replyTo":"","text":"yes they replaced the tank costing me around $1200","replyToPid":0}

11398

{"replyTo":"","text":"don't understand why they put little wobbly sensor inside the tank","replyToPid":0}

612134

{"replyTo":"","text":"Where was this?! -3 at 12:00pm!","replyToPid":0}

11398

{"replyTo":"","text":"lol. its northern michigan last week","replyToPid":0}

925326

{"replyTo":"","text":"It’s the pedophile sensor ","replyToPid":0}

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{"replyTo":"

925326 发表于 2020-02-23 03:51:33 It’s the pedophile sensor

","text":"You grew up with whoress? Happy mother day to your mother","replyToPid":331184}

288532

{"replyTo":"","text":"Pop out the coolant sensor cross a paper clip from one entry to the other should stop that code watch your temperature tho till u get to your shop","replyToPid":0}