x box x shutting off

your truck doesn't provide enough power. Even if it's rated for 400 W, no power supply provides what it's actually rated for. Example computer power supplies are considered to be excellent at 80% efficiency

Do you need at least six or 700 W to reliably run a series X. I recommend you try for the series S with lower power consumption that in something you could fit in the truck will probably do the job just fine

Dont use wireless. Do hardwired. If you are hardwired then do a hard system restart by holding the X button on the x box console, not the x on the controller. Hold it down until your system shuts off. This bypasses sleep mode and actually turns the x box
off. Most problems in GTA can be fixed using this method.

Well that really depends, are you able to turn it back on? Has this happened before? Can you give me more information?

Here are some possibilities:

The Auto-Off setting could be enabled, try to disable it.

The console was too hot, wait for it to cool down.

Might be a problem with the power supply.

Which Xbox 360 do you have? The original, the S, or the E?

Hi Steve. I'm glad to know you are fine.

I'm happy to know that you managed to solve your problem. If you have any other problem, you can write here again.