Transmission shifting Blues
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Junior Member
Joined: Jan 2019
Posts: 1
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Transmission shifting Blues
I have a 2011 F150 that is a 5.0 automatic overdrive and it goes into Fail-Safe where the transmission erratically shifts now and it's almost undrivable now on not knowing what gear is going to take off in it says po720 speed sensor I wash the engine could I have done anything to anything under the hood that would have possibly done this and another thing is when it does go into this deal where it don't shift the speedometer. Quit working and the throttle acts funny
Senior Member
Joined: Dec 2006
Posts: 43,532
Likes: 817
From: Joplin MO
https://www.obd-codes.com/p0720
Symptoms of a P0720 trouble code may include:
Delayed shifts
Speedometer not working
Check Engine Light illuminated (Malfunction Indicator Lamp)
Causes of this DTC may include:
Output shaft speed sensor
Electrical wiring or connections
Transmission fluid temperature sensor
Read more at: https://www.obd-codes.com/p0720
Copyright OBD-Codes.com
You should never wash a modern engine. There are too many electronics to make it safe.
Symptoms of a P0720 trouble code may include:
Delayed shifts
Speedometer not working
Check Engine Light illuminated (Malfunction Indicator Lamp)
Causes of this DTC may include:
Output shaft speed sensor
Electrical wiring or connections
Transmission fluid temperature sensor
Read more at: https://www.obd-codes.com/p0720
Copyright OBD-Codes.com
You should never wash a modern engine. There are too many electronics to make it safe.
Technical Article Contributor
Joined: Jan 2007
Posts: 10,636
Likes: 264
From: Vernon, NY
Yes, glc is right, don't wash a modern engine, unless it is absolutely necessary.
If you really must, make sure it's on a sunny dry day. Unhook the battery, and cover key areas with plastic garbage bags. Also, don't do it with the engine hot, you'll run the risk of cracking the block. Before energizing the truck, have it sit at least 24-48 hours to make sure it is all dried out. The use of a fan hung from the hood latch also helps.
In fact, there are key areas that are outlined on pages 364 through 366 in your owners manual as to where to place protection when washing.
Lastly, DO NOT use a pressure washer or corrosive acids to clean an engine.
If you really must, make sure it's on a sunny dry day. Unhook the battery, and cover key areas with plastic garbage bags. Also, don't do it with the engine hot, you'll run the risk of cracking the block. Before energizing the truck, have it sit at least 24-48 hours to make sure it is all dried out. The use of a fan hung from the hood latch also helps.
In fact, there are key areas that are outlined on pages 364 through 366 in your owners manual as to where to place protection when washing.
Lastly, DO NOT use a pressure washer or corrosive acids to clean an engine.
