2003 Gmc Envoy Service 4 Wheel Drive Light Came On Have4 Replacedthe Mtor

You need to have the computer scanned to see what is causing the light to come on. Try a nationally recognized parts store to have it scanned. Most will do it for free.

because a local parts store scanner wont work on the 4 wd system. you need a repair shop or dealer with a more advanced scanner. i already called them and that was their exact words.

Hello, I'm Danny.

Yes, that is correct. With all the different systems on vehicles these days a scanner or code reader has to have numerous system capabilities to provide diagnostic checks for multiple systems. Auto parts stores like AutoZone or Pep Boys may be able to provide you with a basic 'check engine light' codes but the rest are specialty. Thanks for adding to this thread to save someone some time in the future when deciding what to do when particular system codes need to be diagnosed or how we can help them. Thanks for using 2CarPros.