Where can I locate the transmission control unit for a 2012 Chevrolet Express?

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are Chevrolet Express cargo van intermittently fails to start. Battery is full power and when you go turn the key from accessory on to starting all lights go off on the dash. There is no noises at all. This will continue to happen for at shortest 10 minutes or enough to get a tow and then start by the time it makes it the mechanics. It also intermittently will just turn off while driving. You can be just driving and you lose power steering and realize the engine is just off. doesn't give any signal. Doesn't stutter, just loses power. When either of these scenarios happen, it pops codes U0100 & P0700. These codes usually clear themselves within 50 miles. The van will also go a couple days without any issues or have issues multiplied times in one day. It's been to multiple dealerships and mechanics. We've checked all the, have changed ECM and BCU. Since we're getting the P0700, I would like to try a new TCU. If anyone has an idea where it's located or any other ideas would be appreciated