Express 2500 V8-6.6L DSL Turbo (2010)
In the event of a refill, the scan tool may show that fluid has been added, but the vehicle may not release from the warning level unless it is driven for
greater than 10 km/h (6 mph) for approximately five minutes.
If the vehicle speed has been limited and DEF has been added, it may take up to 30 seconds after engine start with the vehicle stopped for the
EXHAUST FLUID EMPTY message to clear. If the vehicle is driven prior to the DIC message clearing, the vehicle speed will still be limited. If the
DIC message clears while driving, the vehicle must be completely stopped to remove the speed limitation.
If DEF is added under freezing conditions, additional time may be required to remove speed limitations.
Warning Level 9
Warning Level 9 is triggered on the next ignition cycle following a second refueling event without a refill of the DEF reservoir. The driver will hear four
chimes on entering Warning Level 9. The four chimes will repeat every three minutes until the DEF reservoir is refilled. The DIC displays the following
messages:
-
Exhaust Fluid Empty Refill Now
-
Speed Limited to 6 km/h (4 mph)
The messages are alternately displayed every five seconds on the DIC. Both messages remain on the DIC until acknowledged by the driver; however, the
Speed Limited to 6 km/h (4 mph) Max, message remains locked on the DIC.
The DEF Indicator in the instrument panel flashes continuously. The vehicle remains in Warning Level 9 until the DEF reservoir is refilled.
Vehicle speed is limited to 6 km/h (4 mph) maximum.
If the vehicle speed has been limited and DEF has been added, it may take up to 30 seconds after engine start with the vehicle stopped for the
EXHAUST FLUID EMPTY message to clear. If the vehicle is driven prior to the DIC message clearing, the vehicle speed will still be limited. If the
DIC message clears while driving, the vehicle must be completely stopped to remove the speed limitation. For this condition, it is highly recommended
to allow the message to clear prior to driving the vehicle.
If DEF is added under freezing conditions, additional time may be required to remove speed limitations.
Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality)
A supply of clean, fresh diesel exhaust fluid (DEF) is critical for optimum selective catalyst reduction (SCR) efficiency. Selective catalyst reduction
(SCR) efficiency is determined by monitoring the nitrogen oxide (NOx) sensors located upstream and downstream of the SCR. This vehicle provides the
driver with an elaborate series of prompts and warnings that are initiated when the engine control module (ECM) detects a drop in the SCR NOx
reduction efficiency suggesting a diluted or contaminated DEF supply.
When contaminated or diluted DEF is suspected, the ECM initiates the DEF Quality warning process. Once initiated, DEF quality warnings grow
increasingly more serious as the vehicle continues to be driven. The vehicle's current DEF quality warning status is displayed on the scan tool. When a
drop in SCR efficiency is detected, the normally OFF Reductant Field Quality Warning Indicator Command will display Warning Level 1 through
Warning Level 5 depending on the number of miles driven, the number of ignition cycles, and if a refueling event was detected. The series of DEF
Quality Warnings alert the driver that DEF system service is urgently needed.
Warning Level 1
Warning Level 1 is triggered when the ECM first detects the SCR efficiency is below a calibrated value. The driver information center (DIC) displays
the following messages:
-
Exhaust Fluid Quality Poor
-
See Owner's Manual Now
-
89 km/h (55 mph) Max Speed on Restart
The messages remain on the DIC until acknowledged by the driver. The DEF Indicator in the instrument panel is illuminated
Warning Level 2
Warning Level 2 is triggered when the distance driven since receiving the first DEF poor quality message exceeds approximately 805 km/h (500 mi).
The driver will hear four chimes on entering Warning Level 2. The DIC displays the following messages:
-
Exhaust Fluid Quality Poor
-
See Owner's Manual Now
-
89 km/h (55 mph) Max Speed on Restart
