2012 Chev Suburban 162K mikes … won’t start … normally …

… after 6 hour diagnostic time tech states computer is sending wrong codes to Powertrain relay.
Computer sending wrong codes to relay?? WTF!

Also .. tech states car cranks randomly in lot …. No reason …

they have tool to override relay … and car starts and runs just fine …until you turn it off … then no start.

recommend i take car to dealer to have computer reprogrammed…

so…does this sound reasonable? Anyone else in world run into this problem? Could there be another reason?

car is home … so I can’t start it … it will have to be towed unless I can figure out another option.

any direction would be greatly appreciated…

ben
monroe, Mich

6 hours and that'* what you get.....Run......fast and far.....run..

I agree: WTF.

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Sounds like a short somewhere to me. Bare copper, bad connection, something.

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There'* always a reason.

This tells me something wrong in the path between the ignition switch and BCM. While it is running, if the broken thing tries to command start again, it would be ignored. I good diagnostician would look for this to help diagnose better than whatever this is. It probably does it more often while running.

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​​​​​​​Reprogrammed to what?

"Hello dealership, please reprogram my computer so it doesn't randomly try to start itself."

Does this mechanic think that this is programmed into the PCM or something?

[randomlyTriggerStarter=Enable] . . . ??? LOL

No.

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Probably.

Yes.

Does it crank randomly in your driveway/garage/etc.?

If you're handy, get a relay bypass kit for $25.00 at Amazon. Now you can start your car. Take it to a mechanic that knows how to diagnose electrical issues.

Michigan. Rust. Corrosion. Misery for cars.

Get a manual, chase down every ground path and trace all wires. Also check the solenoid wires to/from the starter to wherever they go. Make sure it all looks good and fix what doesn't. I'd give 75% chance your problem would get solved just by doing this.

Too late for that.

Okay . . . ?