Reprogram fob?

GALLARDOSTEPHY88

MEMBER
2011 FORD EXPLORER
V6
4WD
AUTOMATIC
60,680 MILES

So I have the vehicle listed above that I just got a couple months ago through trade in. Everything was fine but recently my dashboard says no key detected. I couldn't get into my car one day and it wouldnt start so I changed the fob battery and Napa tested the battery stating it was at 67%. Now my car wont turn on at all anymore as a daily thing. The lights flash and horn keeps honking. The dashboard that previously light before does not anymore and stays black. I still can't get into the car and have to use the manual key to open the door. When the car finally does turn on the dash also says tire pressure monitor default. The fob remote start use to work to get the car on and just doesn't do anything now? What's going on? Do I need to have my car re-synced? Does it need a battery or is something else going on with the starter or fuses?

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

What you are asking are very good questions. Since it eventually does start, it doesn't sound like a battery issue. I do have a specific question. You mentioned that it has a remote start. It is a factory installed system or is it something that was installed after the vehicle was built?

Also, if you have more than one key, does it happen with others as well?

Here is a link that explains in general how to reprogram a key fob. See if it is helpful.

https://www.2carpros.com/articles/how-to-re-program-a-key-remote-fob

Let me know.
Joe

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Friday, August 21st, 2020 AT 1:10 PM

GALLARDOSTEPHY88

MEMBER
3 POSTS

I believe that it was factory installed. I'm not too sure as I just got the vehicle 4 months ago. It has had 1 previous owner. I have changed the batteries in both fobs but car just doesn't turn on at all. The only way is to physically out key fob in the manual start slot and then my car registers trying to be turned on.

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Tuesday, August 25th, 2020 AT 1:47 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

At this point, based on the symptoms I feel the CAN bus system needs scanned. CAN stands for computer area network. All the computer modules are tied together via a few wires. By scanning the CAN system, it will pick up on any breakdowns in the system.

This is really the way of scanning in the future. Cars have so many modules/computers that if the manufacture was to separately wire each one, the car would weigh another thousand pounds. So, they use the CAN system

Here is a video that shows how it's done:

https://youtu.be/InIlnsjOVFA

Because of the complexity of what you are experiencing, I feel this is what needs done to limit possible causes. Otherwise, it will become a guessing game and a lot of money can be spent unnecessarily.

Let me know if this is something you can have done or if you have other questions.

Take care,
Joe

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Tuesday, August 25th, 2020 AT 8:13 PM

GALLARDOSTEPHY88