Which two conditions must be satisfied before performing a Parked Regen?

• A. Engine fully warmed and coolant above 185 F
• B. Engine cold and coolant below 150 F
• C. Engine warm and oil level high
• D. Battery threshold met

Answer: (A)

Parked Regen is a controlled diesel particulate filter regeneration done while the vehicle is stationary. It relies on generating and sustaining high exhaust temperatures to burn off soot. To start and complete safely, the engine needs to be fully warmed and the coolant temperature must be above about 185 degrees Fahrenheit. When the engine is at operating temperature, heat is reliably produced and transferred, allowing the exhaust to reach and maintain the temperatures required for effective regeneration. The coolant being up to temperature helps prevent overheating of the engine and cooling system during this heat-intensive process. If the engine is cold or the coolant is not yet warm, the exhaust won't reach the necessary temperature, risking incomplete regeneration or potential damage. While battery status and oil level matter for overall vehicle readiness, they are not the primary conditions required to initiate a parked regen.