Isuzu DEF regen problem
Posted in the Isuzu NPR Forum
#1 Sep 5, 2013
Every few weeks I have to put my NPR back in the shop because the engine reduce power light comes on. The regen required red light comes on first, but only for a couple of seconds, then the check engine and engine reduce power light comes on.
#2 Mar 22, 2014
It's obvious that you need to do manual regen done. There is a switch you need to press and it will take between 20 to 30 minutes while in park.
You are likely not telling the whole story. The system must have given messages in the dash with green regen needed. Watch some youtube videos on isuzu npr emissions and regen.
Your driving is likely short or city which will plug up the DPF more. Sustained highway driving of atleast 30 minutes would
#3 Nov 25, 2014
Got a 2012 Isuzu def light flashing and loss of power
#4 Feb 11, 2015
False. I have the same problem. I do mostly long hauls, no messages, only use she'll diesel, and I have done manual regens. They keep using the you must have bought bad fuel excuse.
#5 Jul 2, 2015
I am writing from a 2014 Isuzu NPR, on New Jersey Turnpike. Just drove to NYC from Miami, and now, on a way back - no power.
Last time it happened arround DC. This is the second time.
Extra days for crew, plus hotel, while waiting for part.
You can imagine how it makes me feel about Isuzu, and it's reputation as a reliable business tool.
Did I mention that the truck box is completely empty, in case someone wondered.
I wish we took the old one for this trip.
#6 Jul 15, 2015
Check to make sure that your service people are using the correct oil. Vehicles with a DPF require a low ash oil else the oil will actually accelerate the blocking of a DPF filter.
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