Must be a grounding issue, right?

[TheButcher]

TIA for any help I may find here.

So cliff notes: 2012 Maggied LS3, Slight hesitation/mis-fire on hard acceleration at times. Went into LIMP mode, pulled over and shut it off. Car acted like a dead battery. No crank, lights dim. Jumped the car and it ran and got me home. Replaced the battery and the mis-fire was gone. Figured it was an old battery, and it was. Drove the car yesterday (two weeks later) and it did the same thing and gave me codes:P0068, P0122, and P0223. This time I waited 5 mins and the car fired right back up and drove fine the rest of the way.



So it's the car acting like a dead battery one min, and coming back on line a few mins more that make me thing grounding issue. I'm not dumb when it comes to electric, but then I'm no pro either.



Thoughts?

[0stones0]

Definitely check the grounds. One in the trunk and I believe, 2 coming off the block. One on each side, passenger side being the heavier one. Clean connections are a must.
Not to say this is your exact problem but, doesn’t hurt to check the grounds, regardless.

[Rmkuper]

Check main wireing harness on passenger side between waterpump and exhaust manifold. If you have headers especially this harness is know to fall apart and expose sensor wires. Makes ecu go bananas when the wires get hit enough to short.

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