Neutral Safety Switch NSBU for 5 Speed Allison 6.6l Duramax 01-04 29540479
5 Speed Allison Transmission Neutral Safety Switch NSBU for 2001-2004 6.6l Duramax LB7
Also known as a PRNDL switch. If you are getting a "shift range inhibited" message on the message center along with a flashing light under the gear or range you are attempting to shift to, this switch likely needs replaced.
Some of the symptoms of failure include:
No start condition
Gear shift indicator on dash not following properly
Trans stuck in limp mode or fail safe
DTC's set indicating pressure switch codes
Common trouble codes associated with NSBU failure include:
DTC P0708, Neutral start/backup (PNP or NSBU) switch
DTC P0847, Pressure Switch Manifold (PSM)
DTC P0872, Pressure Switch Manifold (PSM)
DTC P0875, Pressure Switch Manifold (PSM)
DTC P1711, Pressure Switch Manifold (PSM)
DTC P1713, Pressure Switch Manifold (PSM)
DTC U1000, Serial Data Communications
Blank PRNDL Display
Flashing PRNDL Display
Slow or No Engagement of Automatic Transmission
Fits: 2001-2004 6.6l Duramax LB7 with 5 Speed Allison Transmission