# 2002 Chevrolet Silverado 2500HD - Won't go into reverse

**URL:** <https://community.cartalk.com/t/2002-chevrolet-silverado-2500hd-wont-go-into-reverse/173782>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, transmissions\
**Created:** [January 2, 2021, 4:13am UTC](https://community.cartalk.com/t/2002-chevrolet-silverado-2500hd-wont-go-into-reverse/173782 "2021-01-02T04:13:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jim36](https://avatars.discourse-cdn.com/v4/letter/j/6a8cbe/32.png) [@jim36](https://community.cartalk.com/u/jim36)\
**Post date:** [January 2, 2021, 4:13am UTC](https://community.cartalk.com/t/2002-chevrolet-silverado-2500hd-wont-go-into-reverse/173782/1 "2021-01-02T04:13:38Z")

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2002 chevy slv hd2500 turbo with allison trans wont go into reverse sometimes

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [January 2, 2021, 11:17pm UTC](https://community.cartalk.com/t/2002-chevrolet-silverado-2500hd-wont-go-into-reverse/173782/2 "2021-01-02T23:17:13Z")

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It’s been reported by other owners, especially when the weather is cold. One suggestion was low voltage to the NSBU. [https://lincolndieselspecialties.com/i-23847235-gm-allison-6-speed-nsbu-switch-2006-2016.html](https://lincolndieselspecialties.com/i-23847235-gm-allison-6-speed-nsbu-switch-2006-2016.html)