2004 Silverado check engine light is on when you hook up scanner multiple errors or problems ? Truck runs fine shows dash cluster is bad , engine preheat air is bad etc etc ?

Asked by Aug 31, 2016 at 04:21 PM about the 2004 Chevrolet Silverado 2500HD 4 Dr LS 4WD Extended Cab LB HD

Question type: Maintenance & Repair

Every thing in truck runs fine. Duramax diesel, code scanner shows many
errors but every thing works fine ?? It shows dash cluster bad , engine
preheat air relay bad, class 2 data link malfunction.. loss of communications
to engine control system , rear wheel speed sensor malfunction, glow plugs
bad ?? and a couple other items, Gees the truck runs fine so why is it saying
truck is needing total over haul ??? any ideas ????  

2 Answers


Those silverados are really sweet rides but when that check engine light comes on you better have it checked by a shop w/ all the right stuff; sorry, but those lights don't come on for frivolous reasons and did you know a used car dealer will not buy any vehicle that displays a check engine light? This can result from lack of regular maintenance checkups that would replace oil at so many miles, etc. very important to do; u gonna need a pro, sorry and best results for you

That is what is weird I have this truck serviced like clock work if there is an issue of any kind I have it fixed asap. But to have it think the truck fell of a scrap truck ?? Am betting the Processor or PC has taken a crap.... But want it fixed .............

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