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Q: service engine soon light and when you try to take off it feels like its in 2nd on 2003 GMC Envoy

my car has a service engine light on and i get the code p0780. how do i know what it is.
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Generally trouble codes just tell you what system in the vehicle has a malfunction - Many times people will guess as to what is wrong & just start replacing parts. The best recommendation is to find a facility that can properly diagnose the car & then let you know what needs to be repaired. The code P0780 generally relates to a transmission fault & could be an issue with the transmission itself or one of the many electronic devices that control the transmission.
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