Volvo VNL 780 Operator's Manual page 406

396 OPERATION
To perform a parked regeneration, the accelerator pedal must not be depressed, the
transmission must be in the neutral position and the vehicle speed must not be above zero.
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A minimum exhaust temperature of 250 C (482 F) is required for regeneration. The
minimum vehicle speed for an automatic regeneration is 40 km/h (25 mph). When Disable
REGEN is selected in the Cancel REGEN submenu, regeneration is inhibited. Select Enable
REGEN to allow regeneration.