My auto start/stop auto stopped and then auto started

[TONTO]

I've had my ranger for about a month and a half and the auto start/stop feature has always been enabled. I don't really mind it that much although I know it drives others crazy. Well I noticed this past week it wasn't working. Now I have a button that I can enable or disable it, and I did so to see if it would start working again but nada. Not so much that I needed it but more because it concerns me when something suddenly stops working. So tonight my wife and I were driving to dinner and I was telling her about it and wanted her to look it up in the manual. I disabled, enabled and came to numerous stops and it still wasn't working. Well lo and behold later in the evening it suddenly starts working again. I have no idea why it stopped nor started again, but I'm curious to see if anyone has any guesses.

Edit: I just noticed another similar thread to mine after I posted this so mods can delete if needed.

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[Toytec]

Defroster on, low battery voltage, ac max, or sometimes it just has a mind of it's own. Go enjoy your steak.

 

[TONTO]

Thanks for the reply. Unfortunately my wife and doctor have teamed up and tonight I ate something that was far from a nice, juicy steak. ?

 

[Dahveed]

If you go to the fuel economy menu on the instrument panel and scroll to near the bottom it has the current operating mode of the auto start/stop. If you have anything plugged into the 110v outlet, or if the battery is a bit low it won’t shut the engine off. Also the obvious things like cold engine, A/C or heat demand, or high electrical demand will prevent it from stopping the engine.

 

[wanted33]

The ASS on my other vehicle stopped working several months ago. However, no other problems have shown up. Since I'm one of those that can't get used to the thing (re: old), I've never had it checked. Keep us updated if you find the solution, or problem.

 

[egilbe]

Mine was doing that, too. It finally stopped when I unplugged my wireless charging plate from the 110 outlet. I was about to take it back to the dealership to have ASS looked at, but I figured it out

 

[TONTO]

I've had the heat going some but none of the other criteria. It seems to be working pretty consistently now.

 

[AzScorpion]

I've had the heat going some but none of the other criteria. It seems to be working pretty consistently now.

It's possible the voltage just dropped enough to disable it and when it was juiced back up re-enabled.

 

[port43]

Mine was doing that, too. It finally stopped when I unplugged my wireless charging plate from the 110 outlet. I was about to take it back to the dealership to have ASS looked at, but I figured it out

This is why @AzScorpion says to put a night light in the outlet. Any other drain on the system will cause the ASS to inactivate.

 

[Rocketeer61]

Gotta love all these problems. Just imagine how cool it would be if that wretched button wasn't even there. I wonder how many other things in my truck are answers to questions no one is asking...

 

[port43]

Gotta love all these problems. Just imagine how cool it would be if that wretched button wasn't even there. I wonder how many other things in my truck are answers to questions no one is asking...

I just like to enjoy mine and when something happens that I didn't expect? Woo, mystery. Then I go to the innerwebs. Keeps things exciting.

 

[TONTO]

Just thought I would add that this morning it was off again and then later it was on and there was no heat, AC, or anything plugged in. It was Monday morning though and I'm kind of on again off again as well.

 

[SteamiestOyster]

There might be something draining the battery overnight

 

[DukeCanBuildit]

Just thought I would add that this morning it was off again and then later it was on and there was no heat, AC, or anything plugged in. It was Monday morning though and I'm kind of on again off again as well.

Hey Matt,

Also note that selecting “S” mode on your shifter will turn off the Auto Stop/Start (ASS) feature while driving in Sport mode. If you’re switching in and out, you’ll toggle it on and off.

When not in S mode, your truck’s Battery Management System (BMS) is the gate keeper for the ASS. If the BMS determines that the battery needs charging, ASS will be disabled. Anything that draws a lot of power (A/C, Heater Fan, etc.) can affect this.

Some of your truck’s power sources remain on and then power down two hours after you‘ve turned off your truck During that time, anything that draws power can be draining your battery for two hours to the point where ASS is disabled when you get back in the next day but comes back on after driving around and charging the battery for a while. Little things like security system and the truck’s computer system draw very little And shouldn’t drain the battery enough.

So, if you’ve installed things and are taking power directly from the battery or from a hot lead that times out, or if you have a bunch of things plugged into 12v sockets (dash cam, heated seat pad, USB sockets, etc), or if something like a laptop power adaptor/charger is plugged into the console’s 110v receptacle, they might be contributing to this.

Of course, you might have a bad battery - I did, as have others. With a multi meter, measure your battery’s voltage when you park it for the night, then again when you go to drive it the next day. It will likely be well over 12v and shouldn’t drop much overnight. If it does, monitor and record this for a few days, then visit your dealer and provide those details. They can do a load test on your battery to determine if it needs replacing - should be a warranty item. You don’t want to buy it - it’s a couple hundred dollars.

Good luck!

 

[Tim H.]

Hasn’t shut off since the day I took delivery!

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