Weird winter remote lock problem
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
Weird winter remote lock problem
2007 Ford E250
The key fob remote doesn't work in cold weather. Once the weather gets down into the 30's Fahrenheit (sometimes even low 40s) the key fobs won't unlock the doors. Nothing happens when I hit the button.
If I press it repeatedly for a minute or two sometimes it'll work on one of the hits but sometimes not. Occasionally it'll work just fine on the first press.
It is NOT the remote(s). I have two of them and I've installed new batteries in both. They are both kept in the house and plenty warm. Neither one will unlock the doors when it's cold.
I've opened the transceiver/controller box on the side wall under the dash in the passenger footwell and all the connections are clean and good.
Once I start the van and drive it a little everything will usually work fine for the rest of the day. If I leave it parked for a few hours and it cools off enough it'll sometimes act up again.
This is very frustrating as the key doesn't work in any of the locks except the side cargo door. I don't know why, it was that way when I bought it.
This has been a problem with this vehicle ever since I bought the thing eight years ago. I've searched all around the interwebs but haven't found anyone else with the same issue.
The key fob remote doesn't work in cold weather. Once the weather gets down into the 30's Fahrenheit (sometimes even low 40s) the key fobs won't unlock the doors. Nothing happens when I hit the button.
If I press it repeatedly for a minute or two sometimes it'll work on one of the hits but sometimes not. Occasionally it'll work just fine on the first press.
It is NOT the remote(s). I have two of them and I've installed new batteries in both. They are both kept in the house and plenty warm. Neither one will unlock the doors when it's cold.
I've opened the transceiver/controller box on the side wall under the dash in the passenger footwell and all the connections are clean and good.
Once I start the van and drive it a little everything will usually work fine for the rest of the day. If I leave it parked for a few hours and it cools off enough it'll sometimes act up again.
This is very frustrating as the key doesn't work in any of the locks except the side cargo door. I don't know why, it was that way when I bought it.
This has been a problem with this vehicle ever since I bought the thing eight years ago. I've searched all around the interwebs but haven't found anyone else with the same issue.
Mountain Pass
Joined: Mar 2023
Posts: 222
Likes: 54
Do you hear any sounds at the door(s) when you try to unlock? I assume not which points to the Vehicle Security Module (VSM) which you've already realized.
It sounds like a heat thing... maybe try to heat just the VSM with a hair dryer (rather than heating the whole truck) when it doesn't work to see if that changes anything. If it does I'd look for bad solder joints in the VSM module.
It sounds like a heat thing... maybe try to heat just the VSM with a hair dryer (rather than heating the whole truck) when it doesn't work to see if that changes anything. If it does I'd look for bad solder joints in the VSM module.
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
Besides I can't imagine that system uses much juice at all.
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
Do you hear any sounds at the door(s) when you try to unlock? I assume not which points to the Vehicle Security Module (VSM) which you've already realized.
It sounds like a heat thing... maybe try to heat just the VSM with a hair dryer (rather than heating the whole truck) when it doesn't work to see if that changes anything. If it does I'd look for bad solder joints in the VSM module.
It sounds like a heat thing... maybe try to heat just the VSM with a hair dryer (rather than heating the whole truck) when it doesn't work to see if that changes anything. If it does I'd look for bad solder joints in the VSM module.
I've had that little module entirely out (nice to know what it's called) and poked and prodded around on it looking for anything obvious and didn't find diddly. Of course a microcrack or cold solder joint wouldn't be glaringly apparent.
I've tried banging on that fender panel just under the A pillar and shaking the truck while rapidly clicking the unlock button to see if I could shake anything loose but that never accomplishes anything.
I'll have to open that module case and poke around in there when it's cold and acting up to see if I can find anything.
Mountain Pass
Joined: Mar 2023
Posts: 222
Likes: 54
You may want to try tapping on the module itself while trying to unlock.
Another thought... you could push the "Panic" button on the remote while unlock isn't working. It would prove that the VSM is getting the signal from the remote.
Another thought... you could push the "Panic" button on the remote while unlock isn't working. It would prove that the VSM is getting the signal from the remote.
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
I have tried hitting the lock button when the unlock isn't working and nothing happens there either.
It's 37* outside now so I think I'll go play with it a little. Of course it'll work just fine this time since I want it to fail.
Trending Topics
Mountain Pass
Joined: Mar 2023
Posts: 222
Likes: 54
Exactly... I was hoping to see if the issue is reception of the signal or operation of the lock/unlock function although your test of the lock function points to the receiver.
You could also try holding the remote right against the VSM to see if it might work over that very short distance.
You could also try holding the remote right against the VSM to see if it might work over that very short distance.
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
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
Progress! YAY! 
If I put a little pressure against the right end of one of the connection blocks it'll quit working. If I put a finger behind it and pull it out it'll work just fine.
So I brought the VSM inside and broke out the digital microscope. All the connections on that corner of the PCB look good. Now I'm wondering if it's a problem in that wiring harness... although that doesn't make sense to me since it would be a "rattle loose" failure rather than a temperature induced issue.
Time to go back out to the truck and look at the connection block.
If I put a little pressure against the right end of one of the connection blocks it'll quit working. If I put a finger behind it and pull it out it'll work just fine.
So I brought the VSM inside and broke out the digital microscope. All the connections on that corner of the PCB look good. Now I'm wondering if it's a problem in that wiring harness... although that doesn't make sense to me since it would be a "rattle loose" failure rather than a temperature induced issue.
Time to go back out to the truck and look at the connection block.
FTE Community Team
Joined: Jan 2019
Posts: 10,772
Likes: 1,510
Noticed this one up on the main ford-trucks.com page. Interesting issue and progress!
I've seen connectors act badly in cold and/or hot weather. I'm guessing tiny bit of corrosion built up and the temperature causes that slight bit of motion to break connection. Usually I've had good luck unplugging/replugging like 5 times and it clears up. I'll do clean-up on the bad ones.
I've seen connectors act badly in cold and/or hot weather. I'm guessing tiny bit of corrosion built up and the temperature causes that slight bit of motion to break connection. Usually I've had good luck unplugging/replugging like 5 times and it clears up. I'll do clean-up on the bad ones.
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
Noticed this one up on the main ford-trucks.com page. Interesting issue and progress!
I've seen connectors act badly in cold and/or hot weather. I'm guessing tiny bit of corrosion built up and the temperature causes that slight bit of motion to break connection. Usually I've had good luck unplugging/replugging like 5 times and it clears up. I'll do clean-up on the bad ones.
I've seen connectors act badly in cold and/or hot weather. I'm guessing tiny bit of corrosion built up and the temperature causes that slight bit of motion to break connection. Usually I've had good luck unplugging/replugging like 5 times and it clears up. I'll do clean-up on the bad ones.
The little red X seems to be the problem spot.
Mountain Pass
Joined: Mar 2023
Posts: 222
Likes: 54
If it acts up again, you may want to spray both sides of the connection with an electrical cleaner, plug it in and out a few times to scrape anything the cleaner loosens up and then spray again to flush out any crud.
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
I'm not sure the connection is the issue though. It's quite possible pressing on the connector block twisted the board enough to press something together elsewhere on the board.
Tracking a bad connection is like trying to find a water leak. Where you see the evidence isn't necessarily where the problem is.
We'll see.
Hotshot
Joined: Jul 2020
Posts: 10,536
Likes: 2,664
From: Near Salt Lake City
I would not be looking at the module at all, I would be looking at replacing the remote
There is a diagnostic procedure in the book
There are tricks to see if the remote is putting out a signal
Throw your remote in the freezer for a while, and then start the testing
Use an actual battery tester for the battery in the remote (or a DVOM) to verify it has at least 1.5 volts coming out of the 2025 battery
New remote battery, (not from China) first, then a new remote is where I would start
There is a diagnostic procedure in the book
There are tricks to see if the remote is putting out a signal
Throw your remote in the freezer for a while, and then start the testing
Use an actual battery tester for the battery in the remote (or a DVOM) to verify it has at least 1.5 volts coming out of the 2025 battery
New remote battery, (not from China) first, then a new remote is where I would start
Thread Starter
|
Trailering
Joined: Dec 2024
Posts: 17
Likes: 5
I would not be looking at the module at all, I would be looking at replacing the remote
There is a diagnostic procedure in the book
There are tricks to see if the remote is putting out a signal
Throw your remote in the freezer for a while, and then start the testing
Use an actual battery tester for the battery in the remote (or a DVOM) to verify it has at least 1.5 volts coming out of the 2025 battery
New remote battery, (not from China) first, then a new remote is where I would start
There is a diagnostic procedure in the book
There are tricks to see if the remote is putting out a signal
Throw your remote in the freezer for a while, and then start the testing
Use an actual battery tester for the battery in the remote (or a DVOM) to verify it has at least 1.5 volts coming out of the 2025 battery
New remote battery, (not from China) first, then a new remote is where I would start