No shift after 4000 RPM
Thread Starter
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Junior Member
Joined: Aug 2020
Posts: 2
Likes: 0
From: Spartanburg SC
No shift after 4000 RPM
Hi there. New member here. I have a 2017 F150 5.0. Truck shifts and drives normally, but when I floor it, it gets to about 4000 RPM and does not want to shift. Ran diagnostic and it gave me a P0339. Reset all codes and it still has same issue without the code coming back. Don't think it's the crankshaft position sensor or the fuel pump because the truck runs fine at lower rpms and higher speeds. Any thoughts? Thanks in advance.
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
Yes, your second guessing the computer code.
339 says >>intermittent<<. Crank sensor circuit.
Don't dismiss codes. They never fail to give a hint. Re setting to clear a code does not clear any trouble.
What does ya think? Maybe vibration sensitive?
Better at least check the plug-up seating.
Good luck.
339 says >>intermittent<<. Crank sensor circuit.
Don't dismiss codes. They never fail to give a hint. Re setting to clear a code does not clear any trouble.
What does ya think? Maybe vibration sensitive?
Better at least check the plug-up seating.
Good luck.
Thread Starter
|
Junior Member
Joined: Aug 2020
Posts: 2
Likes: 0
From: Spartanburg SC
Yes, your second guessing the computer code.
339 says >>intermittent<<. Crank sensor circuit.
Don't dismiss codes. They never fail to give a hint. Re setting to clear a code does not clear any trouble.
What does ya think? Maybe vibration sensitive?
Better at least check the plug-up seating.
Good luck.
339 says >>intermittent<<. Crank sensor circuit.
Don't dismiss codes. They never fail to give a hint. Re setting to clear a code does not clear any trouble.
What does ya think? Maybe vibration sensitive?
Better at least check the plug-up seating.
Good luck.
Last edited by vadim4120; Aug 21, 2020 at 09:40 PM.