The engine/transmission needs servicing/repair.
Daytime running light module may be the problem
Unplug daytime running light module. It is located on driver side just under the front of the truck.
wrench
No - you do not need to have the truck running.
what about the day running lights? You want to know how to turn them off?If you do then once you start the truck turn the light switch to the left and that shuts them off.
passlock
If the check engine light is flashing with the engine running , that means a spark plug misfire has been detected
the oil pressure in the engine rises when the truck is warming up causing the light to show, if continues after the truck has been running, change oil and oil pump.
it means that you have a bulb out somewhere on your truck.... IE backup light, brake light, turn signal, running light.. etc etc..
By running out of it.
The daytime running light module is found on the front driver of the Ford F 150. It is underneath truck mounted to the front bumper and connected to the wire harness.
with a torque wrench