2018 Tahoe LT 4WD Intermittent Start problem, occasionally will not turn on

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Birdie

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After turning off the vehicle, the Tahoe sometimes loses all electrical charge and will not start, and even the power doors lock.

After a few hours, or overnight, it sometimes just comes back on and starts normally again. The last time it happened, I wiggled the wire connections to the 12v battery and this seemed to fix something, because the car turned on normally after doing so.

The 12v battery gauge shows a normal 12:00 o'clock reading (ie a normal reading), and the SUV seems to charge and hold a charge properly. The alternator works, the vehicle has plenty of power when running, and things work normally with no signs of low or fluctuating power levels(when the car does turn on normally, that is).

Sometimes, the car asks me to open and close the driver's side window and then open and close the passenger side window.

Looking for a do it yourself solution.
 

STORMIN08

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like all things electrical, inspect and clean all larger powered connections, grounds ect.
 

Big Mama

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X2 on the connections. Wouldn’t hurt to get the battery load tested to see if there’s a dead cell.
 

Bob2C

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Check the ground behind the engine block on the driver side near firewall. I have heard of people having issues with it not secured properly


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16rgs

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I had the same issue on my 18 Tahoe. Intermittent until one morning it would not start at all. Towed to dealer. They diagnosed it as the starter. Replaced under warranty. No problems since.
 

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