Engine runs after pressing off button?

KCFAN221

MEMBER
2010 BUICK LA CROSSE
3.0L
V6
2WD
AUTOMATIC
85,000 MILES

The car listed above will stay running after pressing the off button. Everything else powers down including radio, dash interior and exterior lights. The only way I've found to shut it off is pulling the ECM ignition fuse, but you can still hear a humming sound like something is still drawing power. After a day of sitting the battery is dead (new battery) and needs jumped. Help!

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

That is an interesting one. Because of the electronics involved, I feel the best place to start is by scanning the can-bus system.

CAN stands for controller area network. Basically, the different modules are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know if this is something you can do or have done.

Take care,

joe

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Tuesday, February 21st, 2023 AT 9:34 PM

KCFAN221

MEMBER
3 POSTS

It is throwing code P069E which is FPCM issue I wouldn't think those would be related by preventing car to not shut off but I could be wrong.

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Tuesday, February 21st, 2023 AT 11:14 PM

KCFAN221

MEMBER
3 POSTS

Solved. I took it to a dealership they traced it back to two corroded wires under the trunk that was causing issues. Replaced both and now runs great.

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Wednesday, February 22nd, 2023 AT 6:45 PM

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

Thank you for the update. I'm glad to know you got the problem resolved. Also, chances are your reply will likely help others.

Take care and feel free to come back anytime in the future.

Joe

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Wednesday, February 22nd, 2023 AT 7:22 PM