Will not start

Hello,

Just to clarify, when you turn the key the car does not do anything? No clicking noise or crank?
Was there any issue before you shut the vehicle off last?

It could few different reasons for the engine not to start.
It could be for a faulty ignition switch, bad starter relay or bad starter.
Have you tried jump starting the car? I know you said plenty of power, but you want to be sure before trying any other way to fix the vehicle.

You might find this video helpful:

https://youtu.be/dCjmRL3p4Cs

https://www.2carpros.com/articles/starter-not-working-repair

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please let me know little more information.

Thank you.

The speed sensor will not keep it from starting.
So does the engine cranks over? If it is cranking but not starting you could have a bad crank sensor.
If it clicks then it could be a starter relay or solenoid. Check the relay to see if it is corroded. That relay is located under the hood in the fuse block (see diagram below).

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know what you find.

Sounds good. Just open a new thread for the Trailblazer.
Thank you.