Volvo VNL 780 Operator's Manual page 400

390 OPERATION
To disable automatic regeneration, scroll to the Aftertreatment menu in the DID, select
"Cancel REGEN" and select "Disable REGEN". When automatic regeneration is disabled,
the letters ATS with an X through them will be displayed in the DID. It is important to
enable regeneration as soon as possible by scrolling to the Aftertreatment menu, selecting
"Cancel REGEN" and selecting "Enable REGEN".
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Note: It is important to enable regeneration as soon as possible to avoid engine problems.
Long term engine operation with regeneration disabled will result in a loss of engine
performance including horsepower, torque, speed and temperature derates. Also, the DPF
filter will become overloaded with soot and require service at an authorized Volvo dealer.