Express 2500 V8-6.6L DSL Turbo (2010)
detection should still function properly.
If the tank is frozen, the detection process can be delayed.
Warning Level Strategy
Warning Level Strategy
The following information describes the warning level strategy.
An adequate on-board supply of diesel exhaust fluid (DEF) is critical for the reduction of exhaust oxides of nitrogen (NOx) levels within the selective
catalyst reduction (SCR) stage. This vehicle provides the driver with an elaborate series of prompts and warnings that are initiated when the DEF level
falls below a calibrated value to insure the vehicle remains compliant to emissions regulations.
The engine control module (ECM) monitors the DEF level and consumption rate in order to calculate an estimated range in miles remaining until the
DEF reservoir is empty. DEF levels are detected by the position solid-state DEF level sensor. Typically, DEF warnings begin once the estimated mileage
falls below 1,609 km (1,000 mi). Once initiated, DEF warnings grow increasingly more serious as the remaining mileage decreases without a DEF refill.
The vehicle's current DEF warning level is displayed on the scan tool as Reductant Level Warning Indicator Command Level 1 through Level 9. If the
vehicle is not in any warning strategy, it will be displayed as "None."
Warning Level 1
Warning Level 1 is triggered when the DEF level falls below the top-most position of the DEF Level Sensor and the estimated range remaining is greater
than 1609 km (1000 mi). No prompts or warnings are presented to the driver.
Warning Level 2
Warning Level 2 is triggered when the estimated range remaining falls below 1,609 km (1,000 mi) based on current DEF consumption rates. The driver
information center (DIC) displays the message Exhaust Fluid Range X MI, where X is the estimated range remaining in miles. This message remains on
the DIC until acknowledged by the driver.
Warning Level 3
Warning Level 2 automatically advances to Warning Level 3 when the ECM detects an ignition ON to ignition OFF event. A level 3 warning remains
active as long as the estimated range remaining is greater than 644 km (400 mi) based on current DEF consumption rates. No prompts or warnings are
presented to the driver.
Warning Level 4
Warning Level 4 is triggered when the estimated range remaining falls below 644 km (400 mi) based on current DEF consumption rates. The message
Exhaust Fluid Range X MI, where X is the estimated range remaining in miles is displayed on the DIC. This message is also displayed at the beginning
of each ignition cycle. This message remains on the DIC until acknowledged by the driver.
Warning Level 5
Warning Level 5 is triggered when the estimated range remaining is less than approximately 121 km (75 mi) based on current DEF consumption rates.
