Hey guys I am in desperate need of help. Was driving back home from Houston and stopped for bathroom break. Tried to start truck and it won't crank. Throwing errors all over the place. My sct tuner says error 21000 when I try to clear dtc. I unplugged the battery for now but any ideas will help. I'll take pic of the dash in a few when I reconnect the batt.

 

No such thing as 21000 as far as I know. Should be like p0306. Something like that... Give us some details. Did it try to start? Exterior temp? Which engine? Do you have the smart key? Are you towing currently? Truck on flat ground? Any sign of issue before stopping? If not the battery reset should fix your issue.

 

Not towing anything. It's 3.5 Eco blade key. And no signs of anything before this.

 

Will it start?

 

No it acts like the battery is dead with all the above msgs. I unplugged the battery for about 10 mins but didn't do anything.

 

Same thing happened to me.....ended up being a bad ground connection to the PCM

https://www.f150forum.com/f118/2016-...inutes-355255/

 

I'm guessing battery issue if it won't crank. Low voltage would probably trigger all kinds of warnings.

It'd be kind of nice if the OP would have taken time to create a signature so we knew year and model and powertrain. And if it's tuned........

 

It's 2015 xlt 3.5 Eco and it has mpt tune. But I have had it for 8 months or so no issues.

 

Are you running an aftermarket tune? If so reflash to stock and see if it starts. If it does put your tune back on and should be good to go.

 

Here's a pic of where I believe the PCM is grounded. They had to replace the connector. Not sure which one but I'd check to see if those are connected well...you can see in the pic the red nuts they scratched when removing...