Change battery now check engine light is on?

Tiny
LEEANNE5276
  • MEMBER
  • 2003 CADILLAC ESCALADE
Left my keys in ignition (engine not totally engaged, just enough for radio to work) Forgot to remove them, they were in the car for almost 12 hours. Killed battery, bought a new one, replaced it. Now check engine light is on? What is the deal?
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Monday, November 23rd, 2009 AT 1:47 PM

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Tiny
KASEKENNY1
  • EXPERT
This is not uncommon when there is a battery disconnect. So let's run through these couple of guides and see what comes back:

Let's start with checking for codes and see what is turning on the check engine light.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Next here is a guide that covers common things that go wrong after a battery disconnect:

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

This could be just some erroneous DTCs that get set when the battery is disconnected so what I would suggest is recording the codes and then clear them and see if any of them return.

If they return then we have an issue and can track them down. However if they don't then it was just due to the battery disconnect.

Let us know and we can go from there. Thanks
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Wednesday, July 14th, 2021 AT 9:26 AM

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