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Symptoms the Allison NSBU switch is going bad


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Old 12-16-2007, 07:53 PM   #1
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What are some of the symptoms that the NSBU switch is going bad?
  • following DIC codes MAY suggest the NSBU as the culprit: P0700, P0708, P0847, P0872, P0875, P1711 and P1713.
  • PRNDL display may not show up or only a partial display
  • no engagement even though your shifter is in D or R (like you were in neutral)...this was my situation (and I received a SEL (service engine light) code P0700).
  • you will only have forward motion in 3rd gear or reverse.
  • SEL (service engine light) message that reads something like "shift range inhibited".

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