# 2009 Chevrolet Silverado 3500 check engine light

**URL:** <https://community.cartalk.com/t/2009-chevrolet-silverado-3500-check-engine-light/119854>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, silverado3500\
**Created:** [June 26, 2018, 4:25pm UTC](https://community.cartalk.com/t/2009-chevrolet-silverado-3500-check-engine-light/119854 "2018-06-26T16:25:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Gary35](https://avatars.discourse-cdn.com/v4/letter/g/a587f6/32.png) [@Gary35](https://community.cartalk.com/u/Gary35)\
**Post date:** [June 26, 2018, 4:25pm UTC](https://community.cartalk.com/t/2009-chevrolet-silverado-3500-check-engine-light/119854/1 "2018-06-26T16:25:37Z")

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check engine light & brake light came on at same time &set the code Uo101

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [June 26, 2018, 6:11pm UTC](https://community.cartalk.com/t/2009-chevrolet-silverado-3500-check-engine-light/119854/2 "2018-06-26T18:11:40Z")

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> **[U0101 Chevrolet - Lost Communication With Transmission Control Module](https://www.engine-codes.com/u0101_chevrolet.html)**
>
> Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules...

Tester