Service Vehicle(or engine) soon.

[phoneguyinpgh]

Yesterday I got a warning message on my dash. I can remember if it was service vehicle or the engine. We had gotten 4" of snow yesterday so I parked on the curb with my flashers on and engine off till I cleared the driveway. When I turned the truck back on this warning with a yellow wrench appeared on the dash. The truck appeared to be running normally. When I parked it in the garage I turned it off, waited 30seconds & turned it back on again, the same message came up. This morning on start up I got the same message, but the truck was running normally so I drove to work ( about 1.3 miles) and turned off the truck, waited and turned it back on again & now the message was gone.

Does anyone have any ideas as to what might have caused this warning message??

Also, once at work when I turned the truck back on the engine revved up & it sounded like I had a shop vac running under the hood. This shop vac sound has been happening randomly after an OTA software update several months ago. I assumed that the battery module determined the HVB needed a charge & was recharging the HVB. Is that a correct assumption??? When this has been happening I usually let the engine run for at least a min or more before shutting down but often the engine shuts down on its own.

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[Tiger Dude]

"Service Engine Soon" shows up in my 2023 owner's manual twice - once for overheating coolant and once for don't fiddle with emissions equipment. Check your coolant level. Look for the engine warning light, a flashing one means don't drive. You might want to pull codes at an auto-zone or similar if you don't want to go to the dealer.

 

[Sticks]

Any cheap OBDII scanner can tell you which diagnostic code it's throwing.

In extremely cold temperatures, simple errors like a MAP sensor reading out of normal range are somewhat common.

But there's literally no way to know unless you, or a qualified mechanic, do the bare minimum to investigate.

Also, yes, the hybrid engine RPM is not directly correlated to vehicle speed or throttle position. It will run at optimum efficiency (higher RPM's) to charge the HV battery.

 

[HeyBales]

Since you didn't get an Engine light and not likely a DTC to read - did you get a picture on all these times it did alert?

If you use Fordpass app - did you get a notice?

If not - be ready with phone camera next time.

The sound may the difference between ICE engaged you might say ready to be used - because the catalytic convertor reached 1000 F, compared to times it's not warmed up yet so it won't be used. There is a difference to that sound with ICE running.
You said restarted at work, so that came to mind.

And yes - if HVB lowered to 30%, or with cold temps & you have heat/fan on and it reached minimum 120 F, the ICE would be turned on just sitting there.
You don't need to wait until it shuts off or a minute if just turning it off quickly.
Next startup it'll run immediately if needed for either reason.

 

[phoneguyinpgh]

Since you didn't get an Engine light and not likely a DTC to read - did you get a picture on all these times it did alert?

If you use Fordpass app - did you get a notice?

If not - be ready with phone camera next time.

The sound may the difference between ICE engaged you might say ready to be used - because the catalytic convertor reached 1000 F, compared to times it's not warmed up yet so it won't be used. There is a difference to that sound with ICE running.
You said restarted at work, so that came to mind.

And yes - if HVB lowered to 30%, or with cold temps & you have heat/fan on and it reached minimum 120 F, the ICE would be turned on just sitting there.
You don't need to wait until it shuts off or a minute if just turning it off quickly.
Next startup it'll run immediately if needed for either reason.

I checked the Ford pass app and there is an alert for "Powertrain System Fault 'Illuminates when the system has detected a powertrain or four-wheel drive fault'"
When this message 1st popped up I was parked w/ 2 wheels(right side) up on a snow & slush covered curb and was trying to slowly backup and turn to get into my driveway. I'm going to assume this caused some AWD/4WD wonkiness and is what tripped that alert. I am also going to assume that it just stayed latched in memory when I started back up in the morning. One more assumption; Since the drive to work was normal, with no AWD/4WD intervention needed, it cleared the issue from being active to now being historical which would explain the alert not coming up when I turned the truck back on after I parked at work. I will keep an eye out for the alert again, I just hope this doesn't occur every time the AWD system needs to engage.

I always let my vehicles idle a bit after parking them in the winter to try to top off a battery charge. Father & grandfather taught me that.

 

[HeyBales]

I checked the Ford pass app and there is an alert for "Powertrain System Fault 'Illuminates when the system has detected a powertrain or four-wheel drive fault'"
When this message 1st popped up I was parked w/ 2 wheels(right side) up on a snow & slush covered curb and was trying to slowly backup and turn to get into my driveway. I'm going to assume this caused some AWD/4WD wonkiness and is what tripped that alert. I am also going to assume that it just stayed latched in memory when I started back up in the morning. One more assumption; Since the drive to work was normal, with no AWD/4WD intervention needed, it cleared the issue from being active to now being historical which would explain the alert not coming up when I turned the truck back on after I parked at work. I will keep an eye out for the alert again, I just hope this doesn't occur every time the AWD system needs to engage.

I always let my vehicles idle a bit after parking them in the winter to try to top off a battery charge. Father & grandfather taught me that.

Keep those alerts! Of course they'll be on Ford's server for access anyway by a tech.

Regarding hybrid 12V battery - totally different beast to what prior generations used.
Especially the Maverick.

By the end of a 15 min drive - the battery charge level is almost assuredly dropped to a float charge - under 1A. Maybe it'll be a solid 1A. still...

You giving it a few extra minutes will do nothing for the overall charge.
As it gets colder - just means more fuel used.

Better if it presents itself - during a longer drive for errands - if you don't need to turn off because someone will remain behind - leave On.
Longer time with float charge is better than none. And way better than leaving in Acc mode radio going.

 

[phoneguyinpgh]

Keep those alerts! Of course they'll be on Ford's server for access anyway by a tech.

Regarding hybrid 12V battery - totally different beast to what prior generations used.
Especially the Maverick.

By the end of a 15 min drive - the battery charge level is almost assuredly dropped to a float charge - under 1A. Maybe it'll be a solid 1A. still...

You giving it a few extra minutes will do nothing for the overall charge.
As it gets colder - just means more fuel used.

Better if it presents itself - during a longer drive for errands - if you don't need to turn off because someone will remain behind - leave On.
Longer time with float charge is better than none. And way better than leaving in Acc mode radio going.

I'm aware the ICE is not directly charging the 12v battery, I just thought keep up the practice might be helpful to let the truck put a charge on the HVB when it deemed so before leaving it parked for an 8hr cold soak. My drive to & from work only takes 5min and at home it is garage parked. And I only let it idle like that for 30-60 seconds, not 3-5min.

 

[HeyBales]

I'm aware the ICE is not directly charging the 12v battery, I just thought keep up the practice might be helpful to let the truck put a charge on the HVB when it deemed so before leaving it parked for an 8hr cold soak. My drive to & from work only takes 5min and at home it is garage parked. And I only let it idle like that for 30-60 seconds, not 3-5min.

I wasn't speaking to any idea the ICE did the charging.

I was speaking to the idea extra time at the end of the drive is useful for anything but potentially using fuel to recharge the HVB.

And under 1 min is a waste. With 5 min drive - you'd need to indeed let it stay On for at least 5 min to get anything useful to the 12VB.

But frankly - what's cheaper than likely using fuel as a source for the charger - use your wall outlet as a source for an actual battery charger. Once a week.

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