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Hey I have a 2012 Kia sorento 6 cylinder , push start . I recently got an after market drone remote start put in it , got it out the same day an the traction control light was on an downhill assist then backing into my garage my car would not go into reverse or park . My brake lights worked . I unplugged the battery an restarted my car an it would go into reverse no problems . I have my sorento in every day for a week , where I had had the remote start put in an they kept telling me they had fixed it . Only to find out it was in the same state again . Thought it might be the brake switch , had a new one put in . Still doing the same thing , sept now when I put on my signal light the doors lock an unlock while driving ....... Any suggestion on what may be wrong ??? Or how to fix this problem ???

Vehicle: Sorento sx 2012 v6

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Hi there,

This code indicates an issue with the brake light. Here is a list of possible causes.

P0504 KIA - Brake Switch 'A' / 'B' Correlation

Read more: https://www.autocodes.com/p0504_kia.html

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