I used the remote start to start my 07sierra, it started just fine. Went out to it put the key in and turned it on and the truck shut off. Went to start it again and got nothing but dummy lights. Fuel pump didn’t kick on no click and the gauges won’t even turn on. Service air bag and service 4 wheel drive popped up. (Was never there before). I replaced a few relays, tried relearning the pass key but the security light doesn’t stay on. Replaced the theft control module and nothing changed. Also when I turn the key on just the check engine light comes on right away then about 5 seconds later the rest come on. I can’t use the remote, lock unlock doors, windows, nothing. I’ve used remote start many times before and I did nothing different than before. I’m lost and really need to use my truck again. If anyone has any ideas they would be much appreciated.

Is it aftermarket? If so, unhook it and see what you get.

The remote? No it’* the factory remote.

It sounds like maybe something went wrong with the key or the RF transceiver (that RF-checks the key).

Have you tried a different known-good key?

No I only have one key. Only came with one when I got it.

I feel like my only option is to order an ECM.

Why not just take it to the dealer and have them diag it? Pointless to throw money at it when its quite clear you have no idea what you are doing.

I agree with Mike ^^^^^^^

Take it to a dealer.

A locksmith might be able to help if a dealer is not available.

I would change the title of this thread to something that resembles what going on. It sounds like he'* locked out(DOOR LOCKS) of the vehicle itself.

Good catch Mike, Title Changed.