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Pete
Pete, GMC Mechanic
Category: GMC
Satisfied Customers: 24729
Experience:  GM training and dealer tech for 14+ years. Diagnostics
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14 2500 hd duramax Code p0191 Have a punisher programmer

Customer Question

14 2500 hd duramax
Code p0191
Have a punisher programmer with egr dpf and def delayed
Changed oil & filter &fuel filter than drove 950 miles. Truck ran great. Started it the next morning ran fine. Stopped at a store for a minute came out and truck was squilling, running rough than died
Where should I start
Submitted: 1 year ago.
Category: GMC
Expert:  Pete replied 1 year ago.
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Check for any fuel contamination.In some cases this can be caused by bad fuel or contamination in the fuel with the fuel needing replaced.If this is checked and found to be o.k. let me know.
Thanks Pete