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Would just upgrading the grounds cause a check engine light? I don't like how thin the wire is for a ground on my 2011 malibu 2.4 liter flex fuel car that goes to strut tower
 

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Moved from being tacked onto a Gen8 thread. . . .

Observe that the ground cable has an induction loop in it for the BCM to determine the amount of power flowing into and out of the battery. Running any ground straight from the battery to anywhere will cause issues, ranging from minor to major.

If you add a larger ground cable and it goes through the loop, then it can be any size you choose and there won't be an issue.
 
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