Question about 1999 GMC Denali
Sometimes as with mine i had to take it to the dealer or a trusted mechanic and have him hook up the diagnostic computer to clear it. it will tell him what is wrong with it too. mine was the catalytic converter. it will keep coming on if car is not fixed. i took mine to the dealer and it cost $1200.00 out of my pocket. find someone else if this is the issue and have them only cut off the catalytic converter and only replace that part. much cheaper only cost me $300.00 parts and labor for my 2003 yukon xl.
Posted on Oct 07, 2009
Sometimes it will reset if the battery is disconnected, but most likely it will need to be cleared, before its cleared, read the code and write it down, along with what the code means. then you can determine if its OLD or a NEW code. if it comes back you can check further,
Posted on Oct 01, 2009
Disconnect battery for a few minutes and reconnect this is called a hard crash for the computer
Posted on Dec 15, 2010
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Posted on Jan 02, 2017
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