Allison NSBU Switch 2001-2004
One of the most common problems with the Allison transmission is failure of the Neutral Start Back Up switch.
2001-2004 Part# 29540479
Some of the symptoms of failure include but are not limited to:
This switch easily installs with just common hand tools.
- 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