Auto Start/Stop
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Cross-Country
Joined: Feb 2021
Posts: 87
Likes: 13
Auto Start/Stop
Ok...so I am not up to date on all this new tech stuff. Seems my 2020 F150 XLT Auto Stop/Start works sometimes and other times it does not. I know there is a button to cut it on and off. But why does it work sometimes and other it does not? This morning sitting in an hour long traffic snarl it wasn't working and then all of a sudden it did. Thinking of getting a device...the Range disabler device or something similar. Why does it work sometimes and not all the time?
Logistics Pro
Joined: Jan 2010
Posts: 4,114
Likes: 1,645
Because it is based on a multitude of parameters for it to cut out the engine and restart it. These parameters include:
Engine temp
Battery charge
External temp
Frequency of braking
Effort of braking
And a crapload of other parameters.
Basically it won't cut the motor unless the truck is warmed up, it isn't too cold out, and you come to a full and complete stop with decent pressure on the brake pedal. If you let up on the pedal it will re-start, and then won't shut off again for several minutes.
So, sitting in stop-and-go traffic, it would likely have shut the engine off while you were sitting one time, and then not the next because the battery status was too low from having to restart the truck. Or, you might have been barely pressing on the pedal to hold a stop, which isn't enough pressure to shut the engine off.
It's a confusing mess if you aren't a programmer.
Engine temp
Battery charge
External temp
Frequency of braking
Effort of braking
And a crapload of other parameters.
Basically it won't cut the motor unless the truck is warmed up, it isn't too cold out, and you come to a full and complete stop with decent pressure on the brake pedal. If you let up on the pedal it will re-start, and then won't shut off again for several minutes.
So, sitting in stop-and-go traffic, it would likely have shut the engine off while you were sitting one time, and then not the next because the battery status was too low from having to restart the truck. Or, you might have been barely pressing on the pedal to hold a stop, which isn't enough pressure to shut the engine off.
It's a confusing mess if you aren't a programmer.
Tuned
Joined: Jan 2021
Posts: 324
Likes: 113
From: Southgate Michigan
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Pretty much nailed it. I just bought a 2020 F-150. The auto start/stop feature did not start working until just over 2000 miles on the odometer. Reason: engine charging. Apparently the truck sat a while on the dealers lot and the battery was not up to a full charge. Now after the vehicle is warmed up it works every time I come to a stop.
Pretty much nailed it. I just bought a 2020 F-150. The auto start/stop feature did not start working until just over 2000 miles on the odometer. Reason: engine charging. Apparently the truck sat a while on the dealers lot and the battery was not up to a full charge. Now after the vehicle is warmed up it works every time I come to a stop.
Moderator
Joined: May 2004
Posts: 6,521
Likes: 919
From: Home Base Nebraska
I haven't taken possession of my 2020 yet so I have no experience with the stop and start but what happens when it's hot out and the ac is running will it still shut down at a stop light.
Denny
Denny
Tuned
Joined: Nov 2007
Posts: 397
Likes: 20
From: brigham city Utah
Yes it will still work, the engine will shut off but the A/C will continue to work, in fact all the functions should still work as if the truck is running.
my advice, either let it do it’s thing or get the habit of shutting it off. To me now, it’s just like putting on my seat belt. I just hit the button.
good luck.
my advice, either let it do it’s thing or get the habit of shutting it off. To me now, it’s just like putting on my seat belt. I just hit the button.
good luck.
Fleet Mechanic
Joined: Jan 2020
Posts: 1,369
Likes: 417
I bought the plug in obdii auto start / stop eliminator. I hated it auto stopping, I didn't want to do modifications to the system, as I do check it monthly to ensure all is working as it should.
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Fleet Mechanic
Joined: Jul 2005
Posts: 1,467
Likes: 107
From: Staten Island, NY
Vehicles equipped with the 2.7L EcoBoost engine or the 3.5L EcoBoost engine have the auto start-stop feature as standard equipment, which includes a cabin heater coolant pump. The cabin heater coolant pump provides coolant to the heater core whenever the HVAC system requests heat and the vehicle is in auto start-stop mode. The PCM sends a PWM signal to control the cabin heater coolant pump. Refer to the Owner's Literature, Unique Driving Characteristics for full auto start-stop enabling/disabling information.
ly....
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Moderator
Joined: May 2004
Posts: 6,521
Likes: 919
From: Home Base Nebraska
Actually....Cabin Heater Coolant Pump
Vehicles equipped with the 2.7L EcoBoost engine or the 3.5L EcoBoost engine have the auto start-stop feature as standard equipment, which includes a cabin heater coolant pump. The cabin heater coolant pump provides coolant to the heater core whenever the HVAC system requests heat and the vehicle is in auto start-stop mode. The PCM sends a PWM signal to control the cabin heater coolant pump. Refer to the Owner's Literature, Unique Driving Characteristics for full auto start-stop enabling/disabling information.
ly....
Vehicles equipped with the 2.7L EcoBoost engine or the 3.5L EcoBoost engine have the auto start-stop feature as standard equipment, which includes a cabin heater coolant pump. The cabin heater coolant pump provides coolant to the heater core whenever the HVAC system requests heat and the vehicle is in auto start-stop mode. The PCM sends a PWM signal to control the cabin heater coolant pump. Refer to the Owner's Literature, Unique Driving Characteristics for full auto start-stop enabling/disabling information.
ly....
Denny
Tuned
Joined: Jan 2021
Posts: 324
Likes: 113
From: Southgate Michigan
I thought I would not like it when I first had it on my 2019 F-150. Personally I don't mind the auto stop/start feature. How much gas you save is probably minuscule but hey, with rising gas prices any $$ saved is $$ saved.
Fleet Mechanic
Joined: Jan 2020
Posts: 1,369
Likes: 417
Just wait until you replace the starter, let us know how that expense works out. Auto stop bs is guberment hogwash.
Tuned
Joined: Jan 2021
Posts: 324
Likes: 113
From: Southgate Michigan
Not really worried about that. Have an extended warranty.
Elder User
Joined: Nov 2016
Posts: 904
Likes: 3
From: Pittsburgh
Mine has just started working some of the time. Guess maybe the warming temps have something to do with it. It's kinda strange but I guess I'll get used to it. I drove a Chevy Cruze rental car that had it on a long road trip. There was no way to disable it in that car, at least not that I could find, but I was used to it by the end of the trip.
Thread Starter
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Cross-Country
Joined: Feb 2021
Posts: 87
Likes: 13
Trailer light plug
I saw a video this morning and a Ford technician plugged a round trailer light plug in to the female connector and it stopped the Auto SS. My 2020 XLT only has the small 4 pin trailer connector so I tried doing the same thing with a 4 pin male connector. I thought it solved the SS issue but it didn't. Guess I'll just get in the habit of pressing the button on the dash or splurge for the OBD auto start / stop eliminator.