How to do a Parked Regen

    1. Keep engine at slow idle (cannot be in Fast Idle or PTO Mode). Put transmission in neutral (if equipped with an automatic transmission, cycle it into gear and then back to neutral).

Air tank pressure must be high enough for the parking brake switch to hold in the OFF position.


    1. Set park brake (cycle the park brake OFF then ON for CPC R21 or lower software).

    1. Press and release clutch pedal once per ignition cycle (if configured).

  1. Hold DPF Switch to the ON position for five seconds and then release (engine speed will increase and DPF lamp will go out). regen-buttonEPA07/10/GHG14 Exhaust – EGR – ATS Manual (DDC-SVC-MAN-0083) | 37 EPA10/GHG14 Aftertreatment System Overview | 37.9 Performing a Parked Regeneration – EPA10/GHG14When the parked regeneration request is accepted, the Diesel Particulate Filter (DPF) Regeneration lamp will turn ON one time for one second and then turn off for the remainder of the parked regeneration. The High Exhaust System Temperature (HEST) lamp will flash for one second every ten seconds and eventually become solid when the tailpipe temperature is above 525°C (977°F).The engine speed will increase to 1100 RPM for all DD Platform engines. The regeneration will take 30 to 40 minutes. The regeneration is complete when the engine returns to low idle and the DPF lamp remains OFF. The HEST lamp will remain ON, but the vehicle may be driven.

    NOTE: A parked regeneration will STOP and the engine will return to low idle if any of the following happens:


    • The key is turned to the OFF position
    • The vehicle is put into gear
    • The clutch is cycled
    • The parking brake is released
    NOTE: If a parked regeneration is being performed to check NOx conversion, the calculated ambient temperature in the ACM (AS053) must be above 0°C (32°F) or the test will fail.
    NOTE: If the HEST LAMP is FLASHING, a regeneration is in process and the system is coming up to temperature.

12 thoughts on “How to do a Parked Regen

  1. German

    Did everything step by step and still won’t do a park regen

  2. Mechanic Post author

    Any check engine lights?

  3. German

    Solid check engine light is on

  4. Tim Kline

    During parked regen, the HEST lamp never comes on, does this mean parked regen is not functioning? 2007 Kenworth.

  5. Mechanic Post author

    No, if anything everything is working correctly.

  6. Greg

    Note to add? My 2011 cascadia dd15 requires exhaust brake to be off as well as the cruise control to be off.

    If cruise is on or high idle using cruise in an over night idle, it will try to do a regen but will not complete cycle, it will just idle up and down.( Annoying cycling that will wake everyone)

    Just a few things I’ve noticed

  7. Toy

    TRyna do a regen also on 2010 freightliner Cascada and it won’t regen really need help

  8. Mechanic Post author

    any lights on in the dash?

  9. AnthonyLassiter

    It’s 7 degrees and last night it regen on its own while keeping the truck warm then about 60min the truck cut off and the yellow and red lights were on it started it back it then cut off ….help me

  10. Mechanic Post author

    cover the front grill and hold the regen button to start a regen. Or turn the battery disconnect switch on & off 4 times to reset the computer

  11. sunny

    I have 2012 cascadia just put the quanity control valve did the park regan and force regan but yellow light still blinking and the stop light is on it say dpf soot is to high i have brand new 1 box dealer put for me two moths ago can some one help me please!

  12. Mechanic Post author

    tell me what the faults are

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