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A common issue with the Allison transmission. Installs in about 30 minutes with basic tools.
Symptoms of a bad NSBU switch
- No Start condition.
- Sets DIC codes MAY suggest the NSBU as the cause: P0700, P0708, P0847, P0872, P0875, P1711 and P1713.
- PRNDL display may not show up or flash.
- Delayed or No Engagement of the transmission.
- SEL (service engine light) message that reads something like "shift range inhibited".
Installation Guide