No crank, no start, CEL flashes 8 times and stays on, All battery power turns off when trying to start

Asked by Jared Jan 17, 2020 at 09:10 AM about the 2007 Ford F-150 Lariat SuperCrew 5.5ft Bed 4WD

Question type: Maintenance & Repair

I was on my way to work one morning in my 2007 F-150 Lariat and was
going up a slight incline. My pickup has struggled with jerking and riding
rough occasionally when going up a hill or accelerating heavily. This time, it
made a pretty "sudden jerk" and all power/acceleration was lost. In the heat
of the moment, I shifted it into neutral and gave it a couple taps on the gas
pedal. I noticed it was still reading this as I watched the RPMs go up. I
slowly rolled up to the stoplight (still in neutral) and thought it was just a
random one time issue. I shifted it into drive at the light and when I pressed
on the gas to accelerate it completely died on me and would not start. It
would indeed crank at this point, but I was not getting any CEL. The only
thing I was seeing was the "low oil pressure" message when trying to start. I
ended up having to get towed from the intersection I broke down at. I had it
towed back to my house where i've done some general checks based upon
some information I've been reading when people run into a similar issue. I
instantly pulled the battery and had it checked in which it tested bad. I
received a new battery and installed that. I then tried to start the vehicle
multiple times but it was really struggling to fully start. It would crank, but
never fully "catch". I randomly got it to fire up one time and backed out of
my driveway and slowly reversed/started driving up my street (without
pressing the gas whatsoever/let it coast). As soon as I even slightly began to
touch the gas pedal, all power was lost. I ended up pushing it back down to
my house and parked it in the driveway and continued to do more research.
The main issue I see occurs with a lot of 2004-2008 model F-150s is the
Fuel Pump Driver Module (FPDM) corrodes and ends up leaving you
stranded one day due to it's relation to the fuel pump and other aspects of
the vehicle. Since this was a relatively easy/cheap remove and replace, I
decided to go ahead and swap it out with a new one. Everything seemed to
fit and connect perfectly fine. After swapping this, I was going to attempt a
start but noticed this time that my check engine light now flashes roughly 8
times at me and stays on. When I go to actually attempt a start, it
completely kills all power and the only way to fix it is to disconnect the
battery (or at least the negative terminal) and reconnect. As soon as I do
this, all battery power is applied. I have read a mix of things as to what the
flashing CEL means, with most commonly seeing that it is hinting at a
misfire related issue. The only strange thing about this is that most people
are able to pull codes from the vehicle when they run into this issue, but I
am unable to pull any codes from my OBD-II reader. It literally just says "No
Codes Found on Module" which makes me think it's something different. I
have checked some of the main fuzes/relays that I saw others mentioning
and did not see any issues but am not 100% sure if I checked all of the
applicable ones. I plan to check all of them this weekend. The vehicle does
not crank whatsoever now. I turn the key to the "ON" position and hear the
"ding, ding" noises and my stereo/windows/dash lights all come on. The
battery seems completely fine. As soon as I begin to turn the key the rest of
the way to start, I hear one quick "click" and then all battery power is killed
until I once again disconnect/reconnect the battery. I've seen a lot of other
theories of this having something to do with the PATS system but am not
entirely sure. It definitely seems like between the CEL flashing those specific
amount of times and staying on/it not cranking AT ALL now that it's almost
like the vehicle knows something is going on and doesn't even allow me to.
I'm not sure if this is security related since I removed/replaced the battery or
if it is reading something is severely wrong and doesn't want to start. (Not
even sure if there is such thing but just an idea) I do not have an actual key
fob with unlock/lock/panic buttons, it's just a plain Ford key which could
possibly still have some sort of chip in it though? I'm starting to think it
could be security/alarm/PATS related but that's not saying there isn't still
going to be an issue after that. Any help would be greatly appreciated!

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