Waiting on 04-08 5.4, 4.6 forum to respond so figured I'd ask another 5.4L crowd. Truck is 4spd auto, 5.4L 3V 2008 F150
Good battery, alternator, checked many visual grounds and wires.
When you turn key you only get 3 single symptoms of all the normal functioning sounds, lights, power and function
1. Dash only flash air bag light
2. Speedometer jump from 10-25 mph
3. Buzz/Hum noise from somewhere above fuel tank.

Something I've noticed quite odd is truck will not shift from park with key in any position.
The chrome tab on front of gear shift rod will not depress as normal.
Even attempting to shift truck with the transmission gear selection switch (under truck on driver side transmission connects to shift lever) REMOVED and wont shift as well when depressing brake and rocking truck?


wth!? Anyone here have ways to test certain parts i.e. command start module or other possible culprits without having to throw $$ at the 08 guessing? I've got 2 1986 F350 4DR DRW to throw money at haha

 

Sounds like no voltage. Verify 12 volts at fuse box with multimeter. If yes then there has to be a ground broken somewhere.

It needs 12 volts at key on at steering column to allow you to shift out of park.

 

Resolution found.
Night before the morning truck didn't start there was a severe lightning storm.
A manufactured June 2016 battery 800cca that I charge before and after every winter which takes 6-10 hours each time was completely dead (guess the backup I used is finally worthless...a 2012).
Charged backup and truck battery about 70 days ago.
Has never went dead like this with the 2008 technology where there's never anything "accidentally left on" as all is auto.
Took a little over 48 hours to completely charge battery now truck is fine

 

great. thanks for the report back.
I have similar symptoms and have my cluster into the medic right now for a rebuild.
I'm hoping that will cure problem as I have no other ideas.