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Re: 2012 Isuzu NRR mystery exhaust system problem
Posted to HD/Fleet Forum on 10/12/2020

If you have performed a repair then you will need to perform the drive cycle in order for the computer to take it out of limp mode. Clearing the code will not take it out of limp mode. I find it much easier to just reprogram the ecm and def module to reset it. Login to read more.