DeVille Fan Posted August 2, 2019 Report Share Posted August 2, 2019 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 Link to comment Share on other sites More sharing options...
sonjaab Posted August 3, 2019 Report Share Posted August 3, 2019 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. 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
DeVille Fan Posted August 4, 2019 Author Report Share Posted August 4, 2019 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. Link to comment Share on other sites More sharing options...
sonjaab Posted August 5, 2019 Report Share Posted August 5, 2019 Yes, Battery disconnect sometimes removes codes. 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
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