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5.4L Randomly Dies with Wrench Light and P2105

Last Modified : Mar 30, 2021
Dash of a 5.4 with a Wrench light on

Came across a rare issue recently. This applies to F150, Superduty, or E series vans with a 5.4L 3v Triton. Engine randomly dies, wrench light comes on; vehicle will not restart until you cycle the key off and back on again. DTC's present P2105 and possible U0300. The fix is baffling. Came across a rare issue recently. This applies to F150, Superduty, or E series vans with a 5.4L 3v Triton. Engine randomly dies, wrench light comes on; vehicle will not restart until you cycle the key off and back on again. DTC's present P2105 and possible U0300.

If you follow diagnostic methods, you'll likely replace the electronic throttle body and then the PCM, but the issue will still be present. I have had experience with this before. It baffles my mind each time but I knew right where to look.

I can leave all the coils, swap them around, but it results in no change. The only single thing I have to do is install a Motorcraft coil on cylinder number 1. The other time I ran into this issue was on an Expedition using AC Delco coil packs. In that particular case, we had to replace all the coils.

You can read about other Ford 5.4L Triton Common Problems in Trucks.