2004 Tahoe LT died while driving

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ohcrud

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Hi all.
Had to be towed to the garage that we've used for some years. They have always been good, honest.

The car just died, like flipping the ignition off. Trying to restart, the dash gauges would start up then just go to zero.
Wouldn't turn over.

This was 6 weeks ago. They still have it. Trying to troubleshoot an electrical issue, which is what they think it is. They think in the security system.

No codes. For background the car is at about 187,000 miles. Last summer the alternator was replaced.
We bought the car 5 years ago. Had to have the transmission replaced back then.
Once in a while there's short whistle, random, not loud, that seems to come from under the car.
But the car has always run strong and quiet.
Oh, also, the check engine light has been on since shortly after we bought it and had the transmission replaced, but everything always looked fine to the mechanics.

Any help would be appreciated. Also, can the security system be bypassed?

Thanks
 

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