Strange Issue on 2019 F150

Joined
Jan 14, 2015
Messages
2,226
Location
missouri
Did the radio forget it's stations?

I have seen batteries with an internal crack in the intercell connector intermittently go bad. Sometimes a good slap on the battery will restore it. For a while.
 
Joined
Jul 15, 2003
Messages
2,733
Location
MN
Probably some glitch or maybe something with the security system that tripped and wouldn't allow anything. Even if the FOB doesn't work you can still press the start button and the accessory stuff will come on if I remember right? There may be codes stored in the computer that a dealer or somebody with the ForScan app would be able to read.

Batteries can go bad, but the Motorcraft AGM battey should last more than a year or 2
 
Joined
Jan 2, 2021
Messages
244
Location
Central FL
Key fob battery low/dying...

Unable to lock/unlock/remote crank from the fob...

Likely you had either sat on or squished up the fob in a pocket. This could randomly strike the buttons and/or hold them long enough to cause considerable fob battery drain. But, the fob may have fallen out of sync with the receiver on the truck.

As I understand it, fob remotes use a rotating cipher that stays in sync with the receiver...typically. But if the buttons are pushed too many times and the ciper changes without being in range of the receiver, that can cause them to lose sync and nothing happens when you're back in range and start pushing buttons.

But: within 10 ~ 20 repeat attempts, (manufacturer dependant) the fob and receiver realize that they lost sync and will re-sync after multiple fob button presses. But if the fob had a weak battery, it may have missed the cue from the vehicle receiver to restart the hash sync. 🤔
 

redhat

Thread starter
Joined
Dec 7, 2012
Messages
2,321
Location
WNY
This truck has a physical key to start. So dying fob battery shouldn't effect it much with the transponder being so close to the lock cylinder. But great info! Didn't know a lot of this stuff.

And what was strange was even after I got into the cab, putting the key in in the igntiion and turning it did absolutley nothing. So strange.
 
Joined
Feb 20, 2007
Messages
5,290
Location
Southeast
Curiousity - i had a second-owner 2009 volvo which had a lot of bells and whistles. It would do this a couple of times per year and would eventually start after a hat dance and multiple attempts. Get out, close the door. Lock, unlock, get back in. During the no-starts, it would display “vehicle immobilizer” or something like that. Ford started going to the advanced can bus interfaces after they bought volvo - I wonder if this is tech-sharing glitch. Volvo was key-start.
 

Nick1994

$50 Site Donor
Joined
Feb 19, 2013
Messages
13,885
Location
Phoenix, AZ
Check the battery cables to make sure they aren't loose.

Family member's Tahoe was working fine and then in my driveway was totally dead. Battery cables were a little bit loose.
 
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