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dont have a scanner. Will go to dealership monday

i have a 2017 longhorn and my check engine light and def light are on . i show 1/2 full on def gauge. The truck is tuned with gde in sept. What can cause this to happen

thanks

With tune can i bypass egr recall for repair

does GDE hot tune turn off egr , or what else needs to be done to eliminate it .

Thanks

egr cooler is nation wide recall. for warranty i have to take to dealership when parts are in or i could loose warranty. That is why i wonder if they can see i have a gde tune that could affect my warrnty also

no problems. but when they get parts for egr cooler repair i have to take to dealership. i wasecu flashed in june and gde tune in july

i do not have the stock ecu. It was sent to GDE

can dealerships know if you switched your ecu to a GDE flashed one when you have service done

I noticed my fuel economy was no ,t that great afterwards also. especialy city driving. It goes down when i drive in the highway but not as good as before tune with gde. No problem taking off when engine cold though