Because the DPF is under the car, not 'close coupled' in the exhaust manifold, the car needs to be driven quite a long way (50 miles) at 2000 - 2500 rpm to get the DPF hot enough to promote a passive regeneration.

I have this 2012 NPR, Im calling out more professionals for assistance, seeing as many of my die hards have left the mothership and came here. But I am stumped, my local Isuzu "lead tech" is stumped. This truck came in with a p244b - dpf high differential pressure, p2463 - dpf high soot accumulation, p2459 - dpf regen frequency. I perform a forced selective regen. System goes 200 - regen…

The symbol does not switch on during every DPF regeneration, but only when driving conditions require that the driver is notified. To turn off the symbol, keep the vehicle in motion until the regeneration process is over. On average, the process lasts 15 minutes.

1. If the DPF light is illuminated, the DPF will need to be regenerated. If you check the manufacturer’s handbook it explains that you will need to drive the vehicle for about 20 to 25 minutes at over 2,500 RPM. 2. If the engine management light comes on and the glow plug light flashes then you will not be able to regenerate the DPF by

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    • how long does a dpf regeneration last