2018 p3056 code

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Snoke29

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Dec 26, 2022
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Hello,
Hoping for some help. Hopefully this is okay to post here.
My SIL has a 2018 Equinox LT 2.0
We had a p3056 code but now we can’t get it to come back on.
His car won’t start in cold temps but starts just fine with a battery pack. He also gets the messages: brake assist steering assist is reduced and stablitrack. He also said the auto start at stop lights takes longer than normal to to start up after releasing the brake.
His battery is good. Checked the voltage. I’m leaning toward it needs a new battery current sensor on the negative post but I’m not sure.
Anyone else have an issue similar to this?
 

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