What happens if the vehicle runs out of DEF?
Vehicles in 2010 that will use DEF will have two indicators on the dash that will alert the driver to quantity of DEF on board. One, there will be a new DEF gauge very similar to a fuel gauge today that will indicate level of DEF (i.e. full, half, quarter, etc.) Second, there will be a new DEF low level warning lamp that will illuminate when less than 10% of DEF is in the tank. If the vehicle is operated such that one would run completely out of DEF the vehicle will not be shut down; however, power will be reduced enough to encourage the operator to refill the DEF tank. Once the tank has been refilled the engine will resume normal power levels. FAQ Sections: 2010 Heavy-Duty and MidRange products Cummins Aftertreatment System Diesel Exhaust Fluid Properties and Handling Guidelines Environmental and regulatory issues. For more information, please use the links above, or use the drop-down box at the top of this section.
