Just adding onto this growing thread - I have the same issue. Despite my "Comprehensive" warranty, the Honda dealership wants me to pay them $150 for the diagnosis they did it and another $300 to fix it - in my case, the water has filled up the rear taillight, leaked down the rear hatch and has been tripping the alarm in the middle of the night. I wonder if they'll pay for it when the entire electrical system shorts? Or when my neighbours smash out my windows? How about if the taillight fills so much that it stops working? Then maybe?
Really disappointed - got this car from a KIA dealership less than 90 days ago; bought a third-party warranty too (not realizing the car had the existing "Comprehensive" on it). I've escalated the case to Honda Canada Customer Relations/Retention - hopefully someone will help me with this.
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