DEF Level Low—Initial Warning
When the DEF level is low, the following lamps notify
the driver. See Fig. 11.11. Refill the DEF tank in
order to cancel the warning sequence.
•
One bar of the DEF level indicator illuminates
amber—DEF very low, refill DEF.
•
The DEF warning lamp illuminates solid amber.
DEF Empty
When the DEF level reads empty, the following
lamps notify the drive. See
Fig. 11.12.
•
One bar of the DEF level indicator flashes
red—DEF empty, refill DEF.
•
The DEF warning lamp flashes amber.
•
The MIL lamp illuminates.
Pre-2013 Detroit engines: Power is limited, with a 55
mph (90 km/h) speed limit.
Cummins and 2013 Detroit engines: Power is limited
with progressively harsher engine power limits
applied.
DEF Tank Empty and Ignored
If the empty warning is ignored and the DEF tank is
not refilled, the red STOP engine lamp illuminates in
addition to the MIL lamp and CHECK engine lamp
(on vehicles with a Cummins ISB or ISC/L engine.)
See
Fig. 11.13.
If the DEF is not refilled, a 5 mph (8 km/h) speed
limit is applied after the next engine shutdown, while
parked and idling, or if a fuel refill is detected.
DEF Contamination or SCR Tampering
NOTICE
Once contaminated DEF or tampering has been
detected, the vehicle must be taken to an autho-
rized service facility to check the SCR system for
damage and to deactivate the warning lights and
engine limits.
If contaminated DEF or tampering with the ATS is
detected, the DEF warning light flashes and the MIL
09/25/2006 f610816a
Fig. 11.7, HEST Lamp
07/24/2009
f470542
1
2
1. Batteries 2. DEF Tank
Fig. 11.8, DEF Tank Located Behind the Battery Box
07/24/2009
f470541
1
2
1. DEF Tank 2. Fuel Tank
Fig. 11.9, DEF Tank Located Forward of the Fuel Tank
Emissions and Fuel Efficiency
11.6
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