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Code Question, '93 DeVille

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On my '93 DeVille with the 4.9, if the car had problems that showed up on the Codes and the problems were fixed, will the Codes erased themselves automatically?  Or do they need to be erased manually?

Thanks 

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Pretty sure they may clear themselves after X starting cycles.

Did you use the HVAC controls to check for codes?

You can also use the HVAC controls to clear them also IIRC if they are still there or stored as past codes.

Edited by sonjaab

93 DeVille-13 Chevy Impala

72 GTO - 77 Triumph Bonneville

84 Z-28

Syracuse NY

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Right, I used the Off and Warmer Buttons to produce the Codes.  Some updated info since my last post. The battery needed charging and my electric cord would not reach, therefore I pulled the battery, charged it on the bench and re-installed it.  I decided to re-check the Codes after that and I got very few in comparison.  It seems like the battery dis-connect and re-connect automatically cleared them.  Although I read that you can clear them by the Buttons as you have indicated.  

 

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