Help car wont start or do anything

[mr tahoe]

i have a 2007.5 sierra was working perfectly fine all of a sudden i turned it off try turning it on to no avail windows radio ac controls nothing is responding I don’t even hear the fuel pump or the starter tick nothing flip the key and nothing happens please help!!

 

[gpracer1]

i have a 2007.5 sierra was working perfectly fine all of a sudden i turned it off try turning it on to no avail windows radio ac controls nothing is responding I don’t even hear the fuel pump or the starter tick nothing flip the key and nothing happens please help!!

Check the battery connections.

 

[mr tahoe]

Did that nothing happened
Took the fuse box out cleaned it and all

 

[intheburbs]

Don't just "check" your battery connections. Actually disconnect the positive and negative wires and reconnect them.

You obviously have no power. It's a bad battery, or a bad connection.

Or, try jumpstarting it.

 

[gregoryj]

I had that happen last fall with my 07 Impala. Things showed power , battery OK, but many various things won't work: engine wouldn't turn over, power windows
wouldn't work, trunk release no working, dash display comes on delayed , key won't come out, radio not working , door locks not working, and some other things.
It turned out to be the BCM circuit. I ordered a used one off EBay from the same year and model of car and same part #. Installed, then everything worked
again but radio was locked and engine service light was on, code saying to re-align timing sensor( I think cam but not sure). Anyway, at least I could drive
40 miles to closest GM dealer to reprogram the BCM for the car and do the alignment for the sensor, then all was good. The used BCM was $65,
dealer re-setting things was $50. This may not be your problem, but worth considering if
no fault is found with the power/battery system.

 

[gpracer1]

Battery, battery connection or ignition switch (least likely)

 

[kbuskill]

Check the 175 amp mega fuse on the firewall by the battery. It's highly unlikely that it is blown but the connections on either end could need cleaning/tightening.

 

[mr tahoe]

Hey guys and gals I’ve tried everything mentioned above to no avail
Im stomped here
Literally nothing happens the dash wont even light checked engine fuse box its got power and everything but the one inside the cab is completely dead...

 

[mr tahoe]

Okay kinda odd i was fiddling with the Sierra and nothing was working so i kinda got mad and punched the airbag and the horn beeped !!!
So apparently there is power i guess ??
Im just really oddly confused
Please any help

 

[Doubeleive]

have you had the battery tested? it may put out enough voltage to beep a horn but not start or do anything else.....