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Transmission in high gear from a stop, red light indicactor on 2WD is red on 2005 GMC Sierra 1500

Transmission will be in high gear starting out and will not down shift when I accelerate. The red light at the 2wd selection is red was green before.

Asked by for the 2005 GMC Sierra 1500
scan trans codes and ck fluid level and condition
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1 more answer
check tranny fluid levels and condition. review when last serviced. it may be due. bring to tranny shop for diagnostic run. tranny tech. will advise.