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Responding to Diesel Exhaust Fluid Messages
By Blog Post on July 1, 2010 4:36 PM
The exhaust aftertreatment technology of the new Duramax 6.6L diesel engine available on the 2011 Silverado and Sierra trucks and 2010 interim and 2011 Express and Savana vans features the use of Diesel Exhaust Fluid (DEF).
The DEF system must be refilled periodically in order to maintain proper operation. Refer to the June edition of TechLink for details on DEF system operation.
The DEF required for emission reduction is contained in a 5.3 gallon (20 liter) reservoir, providing a range of approximately 5,000 miles (8,000 km) between refills. If the DEF is not refilled, the vehicle's speed will be limited.
The Driver Information Center (DIC) will provide the driver with current information about the DEF system operation and range. These messages include:
· EXHAUST FLUID RANGE: 1000 MI
· EXHAUST FLUID RANGE: 300 MI
Below 300 miles (500 km) of range, the range message or speed limiting messages will appear every time the vehicle is started.
TIP: DEF should be added prior to receiving an Exhaust Fluid Empty DIC message; however, it may take several miles of driving for the DIC message to update.
With an empty DEF tank, limited speed messages will be displayed:
· 55 MPH MAX SPEED UPON RESTART (Vehicle speed limited to 55 mph (89 km/h) at the next restart.) (Fig. 7)
· 4 MPH MAX SPEED NEXT FUEL FILL (Vehicle speed limited to 4 mph (7 km/h) after the second fuel fill without refilling the DEF tank.)
If the Exhaust Fluid Empty message is displayed:
· When refilling, more than one gallon of DEF must be added to release the vehicle from speed limitation.
· Wait for up to 30 seconds with the engine running for the Exhaust Fluid Empty DIC message to clear.
· If the vehicle is driven prior to the Exhaust Fluid Empty message clearing, the vehicle will still be speed limited.
· If the Exhaust Fluid Empty message clears while driving, the vehicle must be brought to a complete stop to release the speed limitation. If DEF is added under freezing conditions, additional time may be required to release speed limitations.
The DIC also provides similar warning messages for poor quality of DEF and tampering of the DEF system.