# 2008 GMC Sierra 1500 - Alarming problem

**URL:** <https://community.cartalk.com/t/2008-gmc-sierra-1500-alarming-problem/128965>\
**Category:** Maintenance/Repairs\
**Tags:** gmc\
**Created:** [November 16, 2018, 4:12pm UTC](https://community.cartalk.com/t/2008-gmc-sierra-1500-alarming-problem/128965 "2018-11-16T16:12:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Thomas25](https://avatars.discourse-cdn.com/v4/letter/t/977dab/32.png) [@Thomas25](https://community.cartalk.com/u/Thomas25)\
**Post date:** [November 16, 2018, 4:12pm UTC](https://community.cartalk.com/t/2008-gmc-sierra-1500-alarming-problem/128965/1 "2018-11-16T16:12:27Z")

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Horn goes off for no reason and lights flash and this truck starts automatically with out me pushing any buttons. It woke up the neighborhood! I know it will do it again so what should I do?

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [November 16, 2018, 8:31pm UTC](https://community.cartalk.com/t/2008-gmc-sierra-1500-alarming-problem/128965/2 "2018-11-16T20:31:11Z")

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Check under the dash to see if an aftermarket remote start system was added to the vehicle.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [November 16, 2018, 10:26pm UTC](https://community.cartalk.com/t/2008-gmc-sierra-1500-alarming-problem/128965/3 "2018-11-16T22:26:43Z")

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> [@Nevada\_545](#):
>
> see if an aftermarket remote start system was added to the vehicle

And then RIP the thing OUT. Aftermarket remote starters are nothing but trouble.