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Discussion Starter · #1 ·
have an 03 Duramax. Have been getting the error message "Range Shift Inhibited" when I’m driving down the road have to put it back in park until it decides to go into gear. I have had the tranny serviced and replaced the NSBU switch. It is still giving the error "Range Shift Inhibited" and my tranny slips randomly. When put on a scanner it shows no engine or trans codes. This has been going on for a few months & have had it to several shops that specialize in Alison transmissions- they are baffled. The tranny is mechanically sound- can anybody help?
Codes : U1000, C0306, C0327, C0359, C0379
 
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