Engine Protection System
Warning: When the red STOP engine lamp illuminates, most engines are programmed to shut down automatically within 30 seconds. The driver must immediately move the vehicle to a safe location at the side of the road to prevent causing a hazardous situation that could cause bodily injury, property damage, or severe damage to the engine.
See Fig. for an explanation of the aftertreatment system (ATS) warning indicators, and actions required to avoid further engine protection steps.
Fig. 1, ATS Warning Lamps
The STOP engine lamp illuminates when the engine protection system is activated in one of two ways. On some engines, the engine protection system derates the engine, allowing it to run at lower rpm and slower vehicle speed. Drive the vehicle to a safe location or to a service facility.
Important: Safely bring the vehicle to a stop on the side of the road and shut down the engine as soon as the red light is seen. If the engine shuts down while the vehicle is in a hazardous location, turn the key to the OFF position for a few seconds, then restart the engine and move the vehicle to a safer location.
On other engines, the engine protection system shuts down the engine. It first derates the engine, then shuts it down completely 30 to 60 seconds after the indicator illuminates (depending on the critical fault type) if the condition does not improve. Bring the vehicle to a stop on the side of the road before the engine shuts down.
Some vehicles may have a shutdown-override switch, which may be used to momentarily override the shutdown sequence. See EPA07 Aftertreatment System (ATS) for detailed information regarding the shutdown process.
Important: Do not attempt to restart the engine while the vehicle is moving. Bring the vehicle to a safe stop, then restart the engine.
To restart the engine, turn the ignition switch to OFF for a few seconds, then turn the ignition switch to ON and let the gauge sweep complete before starting the engine. The engine will run for a short period and shut down again if the condition does not improve.