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Gear shift indicator not working properly, the vehicle won't start, or the vehicle is stuck in limp mode (3rd gear) and won't move.
- Cleaning the connectors on the plug and doing a hard battery reset may help. (Link for instructional video here)
- The NSBU (Neutral Start Back-Up) Switch is mounted to the transmission and needs to be inspected especially the connector to make sure it's getting a good connection.
- These are notorious for failing on the 2001-2005 Allison transmission, however, for 2009-2015, it should still be checked if it's still in limp mode.