Overdrive off when raining
Thread Starter
|
Trailering
Joined: Aug 2023
Posts: 18
Likes: 1
Overdrive off when raining
As the title says, my overdrive turns off when it begins to rain. More specifically heavy or really windy rain. If it's just a light rain there's no issues. It can vary between constantly being off and flipping on and off. This past weekend I took the plug out of the PCM and cleaned the connections and put dielectric on the connector to help water proof the PCM. This apparently didn't fix the issue. I tried to open the fuse box to check if it got wet but nothing wad wet. I did notice that the PCM relay was hot though. That tells me there's still a short somewhere but I don't know where to start looking.
Cargo Master
Joined: Mar 2010
Posts: 2,230
Likes: 149
From: Higginsville, MO
I would start with the plug going into the transmission and work my way back to the engine compartment from there. Chances are the water is getting in near the trans, it shouldn’t really be wet up under the hood by the fuse box.
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
Are you sure it's coming out of 4th and going to 3rd and not just staying in 4th but releasing the torque converter clutch?
The screnario above can be a very simple brake light ground issue or as stupid as dirt buildup in the trailer connector becoming electrically conductive and shorting power between a couple pins and the trailer brake wire backfeeding through the brake controller.
If thr transmission is actually downshifting to 3rd, it will be something else entirely.
The screnario above can be a very simple brake light ground issue or as stupid as dirt buildup in the trailer connector becoming electrically conductive and shorting power between a couple pins and the trailer brake wire backfeeding through the brake controller.
If thr transmission is actually downshifting to 3rd, it will be something else entirely.
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
^ what Cleatus said, check the trailer connector.
Had the same issue with my 95. Somehow the connector got bent downwards and when I washed my truck the connector filled up with water causing the TC to release at random times. Maybe yours is doing the same thing.
Had the same issue with my 95. Somehow the connector got bent downwards and when I washed my truck the connector filled up with water causing the TC to release at random times. Maybe yours is doing the same thing.
Thread Starter
|
Trailering
Joined: Aug 2023
Posts: 18
Likes: 1
Are you sure it's coming out of 4th and going to 3rd and not just staying in 4th but releasing the torque converter clutch?
The screnario above can be a very simple brake light ground issue or as stupid as dirt buildup in the trailer connector becoming electrically conductive and shorting power between a couple pins and the trailer brake wire backfeeding through the brake controller.
If thr transmission is actually downshifting to 3rd, it will be something else entirely.
The screnario above can be a very simple brake light ground issue or as stupid as dirt buildup in the trailer connector becoming electrically conductive and shorting power between a couple pins and the trailer brake wire backfeeding through the brake controller.
If thr transmission is actually downshifting to 3rd, it will be something else entirely.
Thread Starter
|
Trailering
Joined: Aug 2023
Posts: 18
Likes: 1
Where is the plug located on the transmission?
Trending Topics
Thread Starter
|
Trailering
Joined: Aug 2023
Posts: 18
Likes: 1
I'm not 100% sure what TC means (I assume traction control but I don't think mine has that) but I'll still check out the plug next time it rains and see if it's filled.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
It is on the passenger's side of the trans. It is NOT the cause of losing fourth gear.
The wires that can turn on the OD OFF light and cause it to lose fourth gear are not in that connector. They are in the shifter handle and the PCM (Powertrain Control Module) connector. Somewhere between the PCM and the shifter you have a wire that is getting water into it and causing a short. It's probably not in the shifter handle unless the interior is getting drenched when it rains.
TC can mean traction control, transfer case, turbo charger, or in this case, torque converter.
The wires that can turn on the OD OFF light and cause it to lose fourth gear are not in that connector. They are in the shifter handle and the PCM (Powertrain Control Module) connector. Somewhere between the PCM and the shifter you have a wire that is getting water into it and causing a short. It's probably not in the shifter handle unless the interior is getting drenched when it rains.
TC can mean traction control, transfer case, turbo charger, or in this case, torque converter.
Thread Starter
|
Trailering
Joined: Aug 2023
Posts: 18
Likes: 1
It is on the passenger's side of the trans. It is NOT the cause of losing fourth gear.
The wires that can turn on the OD OFF light and cause it to lose fourth gear are not in that connector. They are in the shifter handle and the PCM (Powertrain Control Module) connector. Somewhere between the PCM and the shifter you have a wire that is getting water into it and causing a short. It's probably not in the shifter handle unless the interior is getting drenched when it rains.
TC can mean traction control, transfer case, turbo charger, or in this case, torque converter.
The wires that can turn on the OD OFF light and cause it to lose fourth gear are not in that connector. They are in the shifter handle and the PCM (Powertrain Control Module) connector. Somewhere between the PCM and the shifter you have a wire that is getting water into it and causing a short. It's probably not in the shifter handle unless the interior is getting drenched when it rains.
TC can mean traction control, transfer case, turbo charger, or in this case, torque converter.
Cargo Master
Joined: Apr 2012
Posts: 2,029
Likes: 530
From: Bottom Of Pikes Peak
In the meantime, you could scrounge around in the cab under the steering column to drivers side to see if you see any moisture/water anywhere.
I do not know if a leaking hydroboost unit would be able to leak on anything related...oops, I forgot what section I'm in. Not even sure if you have hydroboost
I do not know if a leaking hydroboost unit would be able to leak on anything related...oops, I forgot what section I'm in. Not even sure if you have hydroboost
Thread
Thread Starter
Forum
Replies
Last Post
brucewon
1948 - 1956 F1, F100 & Larger F-Series Trucks
20
Dec 28, 2009 08:53 PM
Billpatti
1999 - 2003 7.3L Power Stroke Diesel
1
Apr 23, 2005 07:57 PM
chris93
Clutch, Transmission, Differential, Axle & Transfer Case
2
Mar 10, 2003 07:30 AM