Truck won’t shut off!!

[j.o.y.ride]

Not wise to disconnect battery of a running vehicle. That can cause a surge that blows things!
Pull something like the fuse for the injectors, fuel pump or ignition. but never pull the battery cable when a vehicle is running. You can blow electronics because it can cause a spike in voltage - alternators hate it. I've seen diodes blown to bits.

Curious what you would suggest then? If I were in this situation and it would not stop first thing I would do is the same, pop off the negative terminal. What is better? Pull fuel pump fuse and then disconnect?

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[ShadowsPapa]

Curious what you would suggest then? If I were in this situation and it would not stop first thing I would do is the same, pop off the negative terminal. What is better? Pull fuel pump fuse and then disconnect?

Yes.
F04 (? I believe is fuel pump if memory serves)
next choice F70 - kill ignition/injectors, whatever, force it to die without stress or damage.

Why I say that is that shutting down fuel would be my first choice since at that time, I'd likely be concerned, and not knowing what the #@$% is going on and wanting to kill fuel supply to an engine that won't behave - and can't shut off. Kill fuel pump you know It's going to die - and kill fuel supply to the engine bay.
Understood that if it's the first time such a thing happens, there's likely to be a WTF moment and perhaps a bit of - for lack of a better word and I'm sure there is one - "panic", so most are going to be in that hurry up just kill the danged thing mode even though unless it's a run-away engine screaming at 6,000 RPM and you can't stop the truck - you have all the time in the world to shut it down.

Yes if mine misbehaved like that I'd want the battery (batteries) disconnected because the cause would be unknown and one would rightly wonder what's "stuck". Could end up with dead batteries or worse, a smoldering truck. Could be simple and no risk at all......... I hate unknowns.

I get it - there's going to be a semi-panic going on.
Holy crap, the engine won't shut off and all sorts of things could be swimming in a person's head. Here's this thing you can't get to die. What else is wrong?
I just hate to see someone end up with bigger expenses, possible other damage from something semi-simple.
I don't know why I care what happens to a truck that's not even mine and I may never see - but I do.

 

[Smitschke]

Yes.
F04 (? I believe is fuel pump if memory serves)
next choice F70 - kill ignition/injectors, whatever, force it to die without stress or damage.

Why I say that is that shutting down fuel would be my first choice since at that time, I'd likely be concerned, and not knowing what the #@$% is going on and wanting to kill fuel supply to an engine that won't behave - and can't shut off. Kill fuel pump you know It's going to die - and kill fuel supply to the engine bay.
Understood that if it's the first time such a thing happens, there's likely to be a WTF moment and perhaps a bit of - for lack of a better word and I'm sure there is one - "panic", so most are going to be in that hurry up just kill the danged thing mode even though unless it's a run-away engine screaming at 6,000 RPM and you can't stop the truck - you have all the time in the world to shut it down.

Yes if mine misbehaved like that I'd want the battery (batteries) disconnected because the cause would be unknown and one would rightly wonder what's "stuck". Could end up with dead batteries or worse, a smoldering truck. Could be simple and no risk at all......... I hate unknowns.

I get it - there's going to be a semi-panic going on.
Holy crap, the engine won't shut off and all sorts of things could be swimming in a person's head. Here's this thing you can't get to die. What else is wrong?
I just hate to see someone end up with bigger expenses, possible other damage from something semi-simple.
I don't know why I care what happens to a truck that's not even mine and I may never see - but I do.

first thing was the fuel fuse. Then after it stopped running I just disconnected the batteries to be safe

 

[ShadowsPapa]

first thing was the fuel fuse. Then after it stopped running I just disconnected the batteries to be safe

Yeah, unlike the myth of SHC, SVH is real.
(where SHC is spontaneous human combustion and SVH is spontaneous vehicle combustion)

 

[Hootbro]

Hoping they can add a stop button to uconnect. My daughter leaves the car running as she is in a rush at work at jumps out of her wrangler. Curious if the ESS function works still.

There is too much liability of having a remote stop function built into Uconnect.

Generally kids will learn those lessons of forgetfulness the hard way to break those types of habit.

 

[Lunentucker]

first thing was the fuel fuse. Then after it stopped running I just disconnected the batteries to be safe

I'll stay out of the guessing game, but please let us know what they find.

 

[Jefe1018]

I'm wondering if the actual engine start stop switch was stuck in run. Does anyone know if this is an actual switch?

 

[wchevron]

I probably would have disconnected the battery. Wouldn't have even thought of pulling a fuse. Another good tip learned on this forum. Thanks.

 

[redriderjf87]

No one's talking down to anyone - just warning them and anyone else looking.

Fair enough - just how I interpreted the Caps lock (as yelling).

 

[ShadowsPapa]

Fair enough - just how I interpreted the Caps lock (as yelling).

Yeah, probably should use italics instead of some of those caps times. To alleviate some of those times it could be taken differently.

 

[Smitschke]

I'm wondering if the actual engine start stop switch was stuck in run. Does anyone know if this is an actual switch?

So I swapped the switch with a friends and same deal. Dealership says there’s a short on the power side of the circuit that’s not allowing the system to turn off

 

[ShadowsPapa]

So I swapped the switch with a friends and same deal. Dealership says there’s a short on the power side of the circuit that’s not allowing the system to turn off

The like is for you - not necessarily the dealer, because you took some initiative and got curious and did some testing, an experiment.
This will be very interesting - and you proved even with a key switch, there may be a problem

 

[Smitschke]

The like is for you - not necessarily the dealer, because you took some initiative and got curious and did some testing, an experiment.
This will be very interesting - and you proved even with a key switch, there may be a problem

Oh I ran codes which showed none tried another switch:button. Checked fuses , checked grounds. Etc etc. I do most of my own shit and don’t like dealers but when it comes to computer and harness problems I’m kinda stuck ya know. My keep started off as a stock gladiator and has evolved at my own hands into a capable overlanding rig

 

[ShadowsPapa]

These things have more ground points than a Falcon Heavy, I swear.
Can't wait to see how this turns out.

 

[whysoserious]

Not wise to disconnect battery of a running vehicle. That can cause a surge that blows things!
Pull something like the fuse for the injectors, fuel pump or ignition. but never pull the battery cable when a vehicle is running. You can blow electronics because it can cause a spike in voltage - alternators hate it. I've seen diodes blown to bits.

Given a fully functional alternator, and all things being equal, I didn't think you could stop a running an engine by simply disconnecting the battery.

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