Hello everyone, I just joined this forum so I could post here, so be gentle.
My son purchased 2015 F150 Lariat, 5.0, not from a dealer. 116,000 miles
It has been shutting down randomly when coming to a stop. Happens several times a week. Extremely dangerous!
When it happens it throws code P0339, Crankshaft Position Sensor. Got that replaced by a mechanic. Still happens.
At my wits end so we take it to dealer. They could not make it happen even after a week. Paid $1000 for a starter. Still happens.
I asked if this is a known problem, "No they've never heard of it", but this forum has many examples.
So many thoughts and opinions on what the cause is, but I can't see where there is an actual answer.
Anyway I just wanted to add myself to the list of this happening.
Is there a class action regarding this? Or should I report to NHTSA?
@Ford Motor Co.

 

P0339 - Crankshaft Position Sensor-A Circuit Intermittent

Description:
This DTC sets when several erratic profile ignition pickup (PIP) pulses have occurred in the crankshaft position (CKP) sensor signal within a calibrated time period when the camshaft speed exceeds the equivalent speed of engine idle or the starter motor is engaged.

Possible Causes:

• CKP+ circuit intermittent open (VR type)
• CKP- circuit intermittent open (VR type)
• CKP circuit intermittent open (Hall effect type)
• VREF circuit intermittent open (Hall effect type)
• SIGRTN circuit intermittent open (Hall effect type)
• CKP+ circuit intermittent short to voltage (VR type)
• CKP- circuit intermittent short to voltage (VR type)
• CKP circuit intermittent short to voltage (Hall effect type)
• VREF circuit intermittent short to voltage (Hall effect type)
• SIGRTN circuit intermittent short to voltage (Hall effect type)
• CKP+ circuit intermittent short to ground (VR type)
• CKP- circuit intermittent short to ground (VR type)
• CKP circuit intermittent short to ground (Hall effect type)
• VREF circuit intermittent short to ground (Hall effect type)
• SIGRTN circuit intermittent short to ground (Hall effect type)
• CKP sensor incorrectly installed
• Damaged CKP sensor
• Incorrect, damaged or corroded connections
• Arcing secondary ignition components (coil, wires and plugs)
• Arcing relays or other high current devices (cooling fan or starter motor)
• On board 2-way radio transceiver
• Radio frequency interference or electromagnetic interference from an external source
• Incorrectly grounded high power aftermarket equipment

Since you have already had the CKP sensor replaced I would be looking at a wiring issue next. RFI from poor performing ignition parts also should be checked. Any 2-way radios?

 

Why would there be a class action for a vehicle that needs repair? If that was the case, anything that ever needed fixing on a vehicle could have a lawsuit on it. Things break and need fixing, that’s part of being an adult and owning a vehicle.

 

Noted.
You should probably just fix your old truck. Things break now and then when you get that kind of miles on one. Unfortunately there could be several potential causes on a truck with that many miles and at least one previous owner who may have messed with the wiring, so even though the problem is probably something simple, identifying it may not be so simple.