Engine shuts off while driving

[sasso]

what you will probably want to do besides a good visual inspection is when it happens, then a run a complete scan and see what module is not talking, something is likely going to show a communication error when the no start occurs. The reason for no codes is because whatever it is self checks later when it does start and passes, so no code.
that's why the dealer and anybody is not going to have a hard time finding it unless it is "actively happening" when diagnosing.
some guesses
crack in fuse box, poor wire connection "somewhere", module getting hot and loosing connection.
I would start inspecting/cleaning at the battery and battery top fuse block, then move over to the fuse box, pull it up and check the connections.
as for the fuel pump, I would check the fuel pressure when it happens versus throwing a fuel pump at it.

Yeah i guess ill try and look for what isnt communicating once it happens again. its at the shop right now so gotta get it to turn off again tomorrow and start working on it again. Will check for fuel pressure, although the scanners live data shows that there is good pressure when i go to crank.

As for the battery, and fusebox, i would assume that it wouldnt start at all, it only has this issue at operating temperatures so im kinda leaning more towards a failing module

 

[Doubeleive]

Yeah i guess ill try and look for what isnt communicating once it happens again. its at the shop right now so gotta get it to turn off again tomorrow and start working on it again. Will check for fuel pressure, although the scanners live data shows that there is good pressure when i go to crank.

As for the battery, and fusebox, i would assume that it wouldnt start at all, it only has this issue at operating temperatures so im kinda leaning more towards a failing module

maybe, the fuse box is a brain of sorts if there was a bad connection leading to say the ecm then it may not start.
It's just something to maybe take a look at, really could be anything.
sometimes intermittent problems can put us at wit's end

 

[Hpb99]

Not sure about a 2023 model but i had the same issue couple yrs ago 99 tahoe, mine was the fuel pump relay, i jumped with a piece of wire & was running only did it on longer runs ( had a bad fuel pump causing it ). Another item to check ,as ive had it happen on a ford & toyota was a bad gas cap ,caused a vapor lock, vehicles would run at night or early morning ,but not during the heat of the day .

 

[sasso]

Alright everyone, so after it being at the garage for a couple of days starting up just fine, they left it on idle for 2+ hours and it wouldn’t stall. I decided to try myself and switched it on, revved it up after it idled for 10 mins, and it refused to stall. I then turned on the AC and it still wouldn’t stall. I then tried to rev it, release the pedal apply the brakes and some steering input and that finally stalled it (still in its place, didn’t drive at all) and it refused to turn on after. Still cranks but doesn’t start. No codes.

 

[blanchard7684]

Alright everyone, so after it being at the garage for a couple of days starting up just fine, they left it on idle for 2+ hours and it wouldn’t stall. I decided to try myself and switched it on, revved it up after it idled for 10 mins, and it refused to stall. I then turned on the AC and it still wouldn’t stall. I then tried to rev it, release the pedal apply the brakes and some steering input and that finally stalled it (still in its place, didn’t drive at all) and it refused to turn on after. Still cranks but doesn’t start. No codes.

Is auto start-stop active when doing this?

 

[sasso]

Is auto start-stop active when doing this?

Yes

 

[blanchard7684]

Yes

Is this more dependent on steering input or brake input?

Edit: if brake input is causing this it could be a leaky brake booster. Any funny whooshing type noises near the brake master cylinder?

If it is steering input my instinct is that something is disrupting the ignition switch . Not sure why it would take 2 hours to show up though…thermal input of some type?

If it is truly the perfect combo of brake and steering then I’m think there is some chafed wiring or something to that effect going on.

 

[sasso]

Is this more dependent on steering input or brake input?

The auto start stop? Not sure. But in park it never switches the vehicle off. Only in D and even if seatbelt is off the vehicle will not switch off

 

[blanchard7684]

The auto start stop? Not sure. But in park it never switches the vehicle off. Only in D and even if seatbelt is off the vehicle will not switch off

See edit. I was thinking it may be good to disable this to see if there is an effect.

 

[sasso]

See edit. I was thinking it may be good to disable this to see if there is an effect.

Tried disabling auto start stop. No change