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Error code u18dc post battery failure

By MikeMikeMike
July 1, 2024 in Troubleshooting, Warranty & Recalls

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MikeMikeMike

Posted July 1, 2024

Posted July 1, 2024

Hi all done a few searches and googled but can't find this error

2020 GMC sierra HD 2500 Denali Diesel. My battery had depleted. Recharged it and then was able to start. I got some really odd things calibrate driver window by opening and closing. check engine light. I called onstarI mean we pay for it right they have me error code u 18 DC. I can't find a thing. Any ideas??

Enthusiast

MikeMikeMike

Posted July 1, 2024

Author

Posted July 1, 2024

One more hiccup the passenger window will no longer respond. All other windows function

2 months later...

Dusty2020Hd

New Member

Dusty2020Hd

Posted September 20, 2024

Posted September 20, 2024

Did you get this figured out. I’m having the same problem 2020 Chevy 2500 HD Duramax

1 year later...

MannyPaz

New Member

MannyPaz

Posted February 18

Posted February 18

Having the same issue today 2022 Chevy 3500 Duramax. Anyone come up with a solution.

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