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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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2011gmc deneli doimax computer displays poor quality def

Customer Question

2011gmc deneli doimax computer displays poor quality def fluid speed cut back to 55mph chevy garage not able to come up with a solution said they tested everything, first time they reset computer ,next time changed def fluid 94000 miles each time after so many miles engine light also comes on
Submitted: 1 year ago.
Category: GMC
Expert:  pETER replied 1 year ago.

I need you Vin nr. Also I have to know if software update was performed on engine computer. Here at my shop we have a lot of problems with does trucks and Def system. Poor quality might also mean that your injector is not injecting sufficient amount of fluid. Your nox Sensors might read wrong. Or there's not sufficient Def pump pressure . So catalyst doesn't occur and computer recognize it as poor Def quality.