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2017 l5p Check engine light is on & def gage is showing——— % any idea what’s going on. Thanks
 

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Sounds like it knows it can't read the def level sensing.

Connector came apart? Harness damaged?

Getting the code might give another clue
 

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Welcome to DieselPlace
(y)
 

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Lots of autoparts places will check codes for you if a dealer isn't near by.
Dealers often will check codes in service receiving bay without an appointment.
 
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