Left work ... went into the grocery store ... was gone for about maybe 5 -10 minutes... came out and car wouldn't start.... lights came on .. radio worked... by the time my daughter came down 5 minutes ... went to start the car .... started right off..... car had been in park..... is my ignition switch going or possibly a sensor.... thank you

The problem original would have been the battery failure but if you had the jump start done incorrectly then the resultant power surge may have knocked out the cpu unit and that is why nothing works properly. Try having the cpu reset by a fault code reader and keep your fingers crossed. You may be lucky

flassed less engine power wth????????? Flashed reduced engine power ! Electronic throttle control problem ! Your best bet ,take it to a GM dealer , buick , cadillac , GMC . You do not have diagnostic test equipment or knowledge to even diagnose this.

sound like theft security problem.when you try ten minutes did you leave ignition switch on position for ten minutes until the security light turn off then turn off ignition switch for 5 seconds then try starting vechicle.when you do 10 minute trick security light has to turn off or disappear when you see security light go off turn off switch 5 seconds then try starting vechicle.

Has the battery been load tested? do that first.

REPLACE YOUR PMC POWER RELAY IN YOUR FUSE BOX.

Hello and welcome to FixYa!
One cause why it wouldn't go in reverse is because of a bad TCM (transmission control module). If the TCM is faulty something in the transmission will surely fail. Please have the TCM checked and replace if necessary.
Hope this helps and thank you for using FixYa! Have a good one!

No, the fuel gauge not working wouldn't have anything to do with your not starting problem , probably the gauge is bad . With the SECURITY light lit , anti-theft system problem ! Service light ????? Service engine soon ? Or service vehicle ? With the light's on code's DTC'S - diagnostic trouble codes are stored . Have it checked , don't guess as to what the problem is. This would prevent the buying of un needed parts .

If there is spark out of one coil than its not the crank sensor.

does this have one coil assembly with 6 posts or are there three individual coils?

If it has three individual coils try swapping the coil that works with one that doesn't. If the one that wasn't working now works and the one that was working doesn't than you have a bad module. If the coil that was working still works and the coil that doesn't work still doesn't work than you have a bad coil.

If it has one coil with 6 posts I would replace the coil and the module. It is not uncommon for the coils to go bad and take out the module at the same time.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Sounds like its a starter problem,if you can pull the starter off take it to an auto parts store,

there are many locations that have equipment to put a load on the starter, and they will be

able to tell if its bad. once you pull the starter off, if you can check the teeth on the fly wheel,

if there is a dead spot, the starter could spin and not engage the flywheel. I hope it's the

starter. the bendix on the starter the teeth that engage the flywheel could also have dead

spot's. and not engage all the time. good luck!