Stuck in drive
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3rd Gear
Joined: Nov 2022
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Stuck in drive
I have a 2018 ford f-150 xl 4x4 2.7l 10 speed. The truck is stuck in drive even when the shifter is in park, reverse, neutral, driveIt shows on the cluster that it switches and its changing on the transmission so it's not the shifter cable.. I was thinking possibly the tcm but on this model it does not have one so I don't know where to start
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3rd Gear
Joined: Nov 2022
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it's not the cluster that just shows drive, the cluster changes like it's supposed to it's just the truck is in drive in all gears.. p,r,n,d,m I took the body/frame ground of and same issue but instead of drive on all gears it's in reverse on all gears.. I'm lost with Diagnosis
Logistics Pro
Joined: Jun 2017
Posts: 3,986
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From: Edmond, OK
Did you ford a creek recently or was your truck flooded? I wouldn't modify the body and frame grounds on a modern truck, especially since our trucks are aluminum. Reconnect that ground and see if the truck changes symptoms again.
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3rd Gear
Joined: Nov 2022
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the last night it was drove it was raining badly.. and the ground cable Is connected in the original place.. I updated the idn for the trans just in case something messed up in the system and it's know stuck back in reverse in all gears.. when I initially put it in reverse it does go in hard.
Moderator
Joined: May 2005
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From: San Antonio, TX
Unplug the transmission wiring harness and spray it out with some WD40. Put a little smear of dielectric grease around the seal on the plug, then put it back together. Make sure it clicks! There is a good chance that a little bit of water got in there. Also, you'd be surprised to know how many vehicles are delivered new that don't have 100% of the harness connections fully seated, as in they weren't connected to the point of locking/clicking together.
Fleet Mechanic
Joined: Dec 2008
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From: Burleson, Tx
What is meant by this? Aluminum conducts electricity quite well, in most cases better than steel (depending on it's alloy composition).
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Logistics Pro
Joined: Jun 2017
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From: Edmond, OK
Messing with body/module grounds and chassis bonding in any modern vehicle is a recipe for disaster. I'm surprised that dealers deliver trucks for sale with incomplete grounding and bonding. Probably because it's all FM to most folks (or even technicians). 
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Lead Driver
Joined: May 2015
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From: Mts. S. of San Francisco
The issue for the aluminum body on a steel frame is galvanic action. In general, "the less noble metal" will corrode toward the more noble metal. Direct connections between steel (for example) and aluminum will corrode the aluminum. In the electrical world this became an issue when aluminum wires met copper connectors, or when you wanted to connect an aluminum wire to a copper wire. There is a goo that you can apply called NOX (or something like that) that you squirt into the connector/connection to kill the oxidation that would otherwise occur.
Fleet Mechanic
Joined: Dec 2008
Posts: 1,914
Likes: 136
From: Burleson, Tx
The issue for the aluminum body on a steel frame is galvanic action. In general, "the less noble metal" will corrode toward the more noble metal. Direct connections between steel (for example) and aluminum will corrode the aluminum. In the electrical world this became an issue when aluminum wires met copper connectors, or when you wanted to connect an aluminum wire to a copper wire. There is a goo that you can apply called NOX (or something like that) that you squirt into the connector/connection to kill the oxidation that would otherwise occur.
But, the factory sure doesn't mind connecting grounds to the body. They're everywhere. As long as it is a clean connection it'll be fine.
As for the corrosion, some people make a huge deal of it but how long does a good solid connection take to corrode is my question. I've had my truck 6 years and none of the steel bolts in aluminum look bad. Heck, how many steel bolts are in aluminum blocks, heads and body panels and have been that way for 15+ years and nothing has happened?
Logistics Pro
Joined: Jun 2017
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From: Edmond, OK
I did a ham radio install in my 96 Oldsmobile and I use an aluminum baking pan as a counter poise. I'd like to get a CB radio too but I think I'd install it in my Bullnose truck instead of my F150.
Sorry,
Sorry,