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Discussion Starter · #1 ·
We own a 2020 Denali with 18k miles on it. We are second owners purchasing it about 3 months ago. We sold our 2013 after it had a windshield leaking issue making our electronic system to fail.

yesterday, we took the vehicle through the car wash. We wash the vehicle weekly. About 30 minutes later, it started flashing “service parking break” along with lots of other errors such as “service transmission”, “service engine”, etc. The car would not shift. We pulled over, turned it off and turned it back on. After dismissing the errors, it would drive. We were away from home so needed to try to baby it home. We also live in the country with mice so we popped the hood to make sure a mouse hadn’t found his way in there chewing wires. No signs of wire issues.
On the way home, car completely shut off while we were driving. It was extremely scary as we had our young kids in the back on a busy road. We managed to get it into a parking lot and called friends to bring us a trailer to get it home.
we couldn’t even load the car onto a trailer. We got the front tires on the trailer and the car completely stopped working again, flashing all the same codes as before. A friend who has knowledge with newer vehicles suggested we held down the emergency break button, start button, and reverse so we could get it off the trailer. That worked. We had to wait 3 hours to have it towed to dealership.
We think maybe the electronic emergency break is engaging and not disengaging? It’s strange the car will move if we hold it down.
Any insights will be appreciated.
 

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Did you buy from a GM dealer and was it a preowned Certified sale? Did you request a Carfax of preveious repairs or issues with it before your purchase?
This does sound serious, but not unheard of. It does sound curious that the issue commenced shortly after the car wash.
I would check the fuse box on the passenger side under the dash near kick panel as well as check on the driver side. Check for any wet carpet on the driver and passenger side.
Does you Denali have a sunroof?

There are drain tubes that become disconnected from the sun roof and allow water to drip into the inside fuse boxes which will cause shorts and if left unattended . .. .. permanent corrosion.
 

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Discussion Starter · #3 ·
We did purchase GM dealer and was a certified sale. It’s still under manufacture warranty which is great. We checked for signs of water damage as we had a similar issue with our 2013 so we knew ahead of time about water leakage issues. No signs of anything. It does have a sunroof and also a second panel in the back that lets lights in. We also thought it could be connected to the car wash. Just strange how it’s gone through many times before this without an issue.
more of a hassle than anything
 

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We did purchase GM dealer and was a certified sale. It’s still under manufacture warranty which is great. We checked for signs of water damage as we had a similar issue with our 2013 so we knew ahead of time about water leakage issues. No signs of anything. It does have a sunroof and also a second panel in the back that lets lights in. We also thought it could be connected to the car wash. Just strange how it’s gone through many times before this without an issue.
more of a hassle than anything
Thanks for the reply and hoping the dealer can get to the root cause.
Please do keep the forum with any updates and resolution. It will invariably help another owner down the road who may experience a similar issue.
 
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