I have had my 2020 F150 3.5L EB for over 3 years now, just rolled 56,000km (34,800 miles) and it threw its first CEL... P0300:00-EC - Random Misfire Detected. On the way to work this morning it was -38°C (-36°F) so it was a nice cool brisk morning here in Northern BC.. Almost a beach day. Truck ran fine no CEL at this point... I plugged in the block heater all day at work and 15 minutes before home time I remote started it let it get decently warm.. -25°C (-13°F) at this point, warmed a little during the day.. Hop in to go home and the CEL is on.. It seemed to be running fine, I drove home and it didn't seem to affect any performance at all. I massaged it home and hooked into FORScan to see:

PCM P0300:00-EC - Random Misfire Detected
PCM P0316:00-6C - Misfire Detected on Startup (First 1000 Revolutions)
PCM P0C2C:00-28 - Electric Transmission Fuel Pump Control Module Feedback Signal Range/Performance
OBDII P0300-C - Random Misfire Detected

I cleared the codes while the engine was still warm.. Started it up.. Let it run for a couple minutes, CEL did not return. I then took it for a 15 minute drive and again no CEL.

Thinking at this point the cold weather and cold start maybe just didn't make it or something happy at first? Even though it was plugged in, still in these temperatures most things aren't happy anyways... Curious to know if anyone else has had this issue or what their thoughts are... I was kinda chocking it up to a cold start and unless the CEL comes back I am hoping I shouldn't be to concerned other than trying to stay warm during this arctic air flow... Good news is Monday we should be back to the -10°C (14°F) temps and expecting more snow so the cold wont be around for long!

Thanks

 

Typically, you see this when the plugs are getting a tiny bit flaky.

Really cold weather tends to uncover ignition problems. I'm not saying it's a dire thing to cope with right now, but I have seen SO MANY spark plugs that work great with just the tiniest bit of heat, but get just a tiny bit crochety when it's super cold.

Tim

 

It has been -32 to -35°C here all day. No CEL for me and my 7 year old battery started my truck this AM without it being plugged in.

Factory spark plugs in it too.

 

The most important code is the P0c2c. it tells that the Transmission internal fluid pump circuit had a failure of some sort.
If it comes back repeatedly, it has to be addressed more. Auto Stop Start will fail if This pump fails but manual start should not be affected..
The cylinder misfires likely are due to the low temperature, some age on the plugs, fuel injector a bit dirty and fuel has Ethanol and a bit harder to fire in low temps or a combination of these possible causes..
Note: cold starting uses a separate fuel injector table for enrichment. This is controlled by the CHT and Ambient Temp Sensors and has a relationship with the Trans..
Once the CHT Temp rises above about 0 c, a warm running table is switched over to.
.
Its all just a combination of mileage under severe low temp conditions and may even be some low voltage involved to aggravate the situation..
It lets you know the vehicle is getting some age and needs some attention.
Good luck.

 

Interesting.. I have a auto/start stop eliminator installed that disables it until I press the button.. Basically just remembers my last setting.. Had it basically since I got the truck as the small city im from doesnt have super long switching traffic lights so it seemed kinda useless.. not like the big cities were you wait 4 or 5 minutes for a light to change..

What sort of mileage/kilometers should one be considering new plugs just for general maintenance?

 

Code 300 appears two times. 316 is a random detection during cranking and running, then clears if the engine keeps running.
Neither one Ids any specific cylinder.
As close as you can come is look in Mode 6 at the cylinder misfire count history.
If one or more cylinders have counts out of limits it could be the Plugs, it can be fuel too lean. etc.
Pull some plugs and look at the Gaps. Are the tips eroded back allowing the Gap to widen etc.
You just have to work with it to have any chance of clearing under the circumstances.
Use a Battery low amp charger with an AGM program when it so cold. Hook it up from + to chassis, closed the Hood , lock the doors overnight.
If the engine starts, does not miss (no cylinder specific code) and runs ok otherwise, don't worry too much about it unless there is a drivability issue.
Don't use fuel with Eth any higher than E10.
Good luck.