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

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

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

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