ISSUE
Detroit™ DT12™ automated manual transmissions may experience difficulty going into gear, especially when the transmission is not at operating temperature.
CAUSE
The steel split rod wears on the aluminum transmission housing, causing the split rod to stick. The Shift Controller cannot read the correct position of the split rod and will not shift into gear. To correct this, a hardened steel bushing and new design split rod with three flattened sides were implemented with transmissions built in August, 2016. For Detroit-built transmissions (transmission serial number beginning with 716), the change took place on August 9, 2016, with approximate transmission serial number 716310E0008107. For German-built transmissions (transmission serial number beginning with 715), the change took place on August 29, 2016, with approximate transmission serial number (last seven digits) 1806530. See Figure 1 for the new bushing and split rod.