When Monitored

WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

This monitor only runs once after a key on event or after the DEF Tank has been refilled while the key is on. Also, the DEF fluid temperature measured by both the DEF Quality/Temperature Sensor and the DEF Level/Temperature Sensor must be above -4°C (25°F). When the ambient air temperature is below 10°C (50°F), the vehicle will have to be driven at least 25 minutes to allow the monitor to run. When the ambient temperature is above 10°C (50°F), the monitor will run and complete after 5 minutes with the ignition on. The NOx Sensor monitor runs after the DEF Tank has been refilled. NOx Sensor data is gathered over varying engine speeds and loads. When enough data has been gathered, the monitor will run, make a pass/fail decision, and begin to gather data again.