The Ford Edge is a hugely popular mid-size SUV that made its debut in 2006.
Despite its good reliability, it’s not uncommon for the alarm to go off randomly.
If you’re Ford Edge alarm keeps going off, this article is here to help…
Why Does My Ford Edge Alarm Keep Going Off?
The most common causes of the alarm going off on a Ford Edge are a dirty or faulty hood switch, door sensor issues or problems with the rear hatch latch. Other causes include a dying 12V battery, a faulty body control module, a low key fob battery and electrical issues.
If your Ford Edge alarm is going off when it shouldn’t then by process of elimination, it shouldn’t be too hard to find the root cause...
1. Hood Switch Problems
Like most vehicles, the Edge equips a hood latch sensor which is essentially an electrical switch.
It is designed to trigger an alarm if someone tries to force open the hood, however if it is broken or clogged with dirt this can trigger the alarm.
Dirty Hood Switch
Due to the prominent location of the hood switch, it is very prone to getting dusty, dirty and grimy – the accumulation of which is enough to cause alarm issues. Corrosion and rusting of the hood switch is also very common, which can also trigger the alarm.
Give the switch a thorough clean and make sure it is completely free of dirt and debris.
Here’s what one Ford owner had to say on CarGurus.com
“My car alarm had the exact problem [going off at random]; clean or replace the hood sensor located right next to the windshield washer reservoir. Its a little rubber nub. I never even knew mine was there. I cleaned it and so far so good. You could also just purchase a new one, easy to replace with a 10mm socket. I’ve replaced a door latch, hatch latch and rear hatch sensor and after almost $800 paid to the repair shop, it appears I fixed it myself.”
Faulty Hood Switch
It’s not uncommon for the hood switch to develop a fault or get damaged from the bumps of driving, from slamming the hood or from exposure to weather.
If the switch that monitors whether the hood is open or shut isn’t working then this will impact the alarm.
If you’re mechanically inclined it’s not too difficult to replace these and you can pick a new one up from autozone for just over $100.
If not have your Ford dealer take a look.
Here’s what a couple of Ford owners had to say:
“For those of us that had it previously [alarm going off at random] it was the hood alarm triggering it. There is a “plunger” like sensor under the hood that goes bad.”
“When my alarm kept going off it was the switch under the hood, passenger side, that was loose (guy at the body shop forgot to tighten it back down)”
2. Faulty Door Sensor
A faulty door latch sensor is a common cause of Ford Edge alarms going off.
Similar to the hood latch sensor, your Edge alarm monitors the doors to make sure no one is opening them.
It’s a good idea to give all door latches a clean and some lubrication with WD-40, open and close the doors to work it in.
Here’s what a few Ford owners had to say:
“Dealer hooked up the computer and said it was a couple of the door switches, so it’s scheduled for the shop next week.”
“It seems the door switch replacement was successful. Haven’t had the door ajar light come on, nor has the alarm randomly gone off since replacing the switch on Wednesday.”
“After 2 months of not sleeping because of the alarm going off, as a last ditch effort I went to the dealer and they found that one of the door ajar sensors had shorted. This is why the alarm would go off at night, the dome lights would come on and off while driving, and the doors would unlock and lock because the computer thinks the door has come ajar when nothing at all has happened in reality. The best $260 I’ve ever spent.”
If you suspect the door sensor is faulty and your car is still under warranty we recommend taking it to the dealer and having them replace it for free.
3. Rear Hatch Latch
Similar to the door sensors and hood switch, the rear hatch latch can also be a common culprit when it comes to alarms going off at random.
Here’s what happened to one owner when they took their Ford to their dealership:
“I was able to convince the dealer to look at it yesterday. They were able to query the computer to see that the alarms were triggered by the rear hatch (which I rarely open, but actually realize now that the alarms stopped after I opened and closed it). They offered to replace the latch, but I declined for now since it isn’t doing it. If it acts up again, replacing the latch will be the next step.”
4. Electrical Issues
2011, 2012 and 2013 Ford Edge models were known to have electrical issues which could cause the alarm to go off at random.
Most owners were faced with a “door ajar” warning light that wouldn’t go away, which would also drain the battery.
Even when the doors were shut, the faulty sensors would signal to the car’s computer that they were still open.
As the door sensors make up part of the car’s alarm system, it’s no surprise that there were numerous complaints from owners who had their alarm go off at random.
According to CarComplaints.com the most common fixes for this problem are:
- not sure (138 reports)
- replace door ajar sensor (47 reports)
- replace door latch assembly (39 reports)
- spray latch with WD-40 (4 reports)
- repair latch, sensor (3 reports)
- clean contact (2 reports
5. Dying 12V Battery
A dying 12V battery or a battery with low voltage can cause a slew of problems, including activating the alarm of your Edge. This should really be the first thing you check as it’s a very common cause and it’s easy enough to check and fix.
Most 12V car batteries last about 3-4 years so it might be time for a new one.
It’s always worth cleaning the terminals first though and making sure the connections are tight and free from dirt, gunk and debris.
Tip: Clean the terminals using a toothbrush dipped in baking soda and water mixture
Failing that, the next step is to check the battery, you can do this with a multimeter.
Here’s what one Edge owner had to say:
“Try another battery for a week and see if it doesn’t straighten out. The battery voltage needs to be well over 12.6 v to hold the relays open.
Also, clean the connections real well, double check the 10 gauge black ground leads to the radiator support. Should be <2 ohms”
How to Test the Battery
- Before testing, remove the surface charge from the battery, this allows for an accurate reading.
- Simply turn on the headlights for 2 minutes then turn off.
- Set the multimeter dial to the ’20 Volts’ setting.
- Make sure the car is turned OFF
The multimeter will have a red probe and a black probe:
- The red probe is for making contact with the positive terminal
- The black probe is for making contact with the negative terminal.
Measure across the battery terminals.
The meter should display a reading, if the battery is fully charged the voltage should be between 12.2 and 12.6 volts.
Anything under 12V and the battery should be charged or replaced.
If you’re not confident doing this, take your car to any AutoZone who often offers free battery health checks.
6. Faulty Body Control Module
A common reason why a Ford Edge alarm keeps going off is due to a faulty body control module.
The body control module or ‘body computer’ is the electronic control unit responsible for monitoring and controlling various systems associated with the vehicle’s body such as the alarm, immobilizers, power windows etc.
The body control module can develop corrosion on the pins or connections can become loose.
You can typically pick one up for around $700 and if you’re not mechanically inclined it’s probably best to have someone at Ford fit it for you.
Other common symptoms of a bad BCM include:
- Repeated battery drain
- Starting problems
- Erratic electrical functions e.g. horn, wipers, lights, lights on the dash
- Security and alarm system problems
7. RFI and EMR
RFI is Radio Frequency Interference and EMR is electromagnetic radiation, both of which can cause the alarm to be triggered on your Edge.
For example, parking underneath overhead power lines will expose your car to high amounts of EMR which can interfere with the electronics on your alarm system.
If you suspect this is the cause, try parking somewhere else out the way.
Here’s some advice from some Ford owners:
“There probably is some sort of RFI being generated around where you park at work which is making your car go insane.”
“If it happens at home, but nowhere else, check your immediate neighborhood to see if one of your neighbors is a HAM radio operator… (look for big antennas, or personalized license plates with their call letters on their cars. In a nutshell Ham operators often transmit very strong signals and that can (and often does) overload poorly shielded alarms and set them off. I’ve set off many alarms in mall parking lots with my 45 watts (2m) transmitter in my car, some home setups transmit several hundred watts.”
8. Low Key Fob Battery / Faulty Key Fob
As the key fob also has controls linked with your Edge alarm system, a faulty, damaged or malfunctioning key fob can send an incorrect signal, which may trigger the alarm. A low key fob battery can cause the alarm on your car to go off at random.
Try using your spare coded key – if the problem goes away then you know you’ll need to replace the battery in your primary key fob.
It’s also advised that you don’t carry big metal objects, electronics or a second coded key on the same keyring as your primary key fob as this can lead to problems also.
It might also be worth giving the inside of your key fob a clean as these can get filled with dirt which could be causing the alarm issue.
In summary, if you suspect your problems might be key fob related you can try the following:
- Check and replace key fob batteries
- Clean the key fob
- Reset the key fob
- Reprogram the key fob
Here’s what a couple of Ford owners had to say:
“Change the battery in the key fobs!! It stopped mine from going off.”
“I’d say the first thing to try would be to spend the $6 and get a couple of new batteries for the FOB and if it still does it then you have a bigger problem. I always try to weed out the simple problems 1st. If $6 fixes the problem then you won’t have to spend any money taking the car to the dealer to diagnose the problem.”
Disconnect the Battery
Sometimes mysterious alarm problems can disappear with a simple reboot, there are no guarantees here but it’s worth a shot.
Disconnect the battery for 20 seconds and this resets many of the electronics in the vehicle.
Check For Warning Messages
When the alarm occurs can you see any lights or warning messages on the gauge cluster?
This can give a clue as to what’s causing the alarm e.g. ‘Hood Ajar’.
Take it to a Ford Dealership
If needed, take your Ford to the dealership.
Tell them you are NOT paying for a check on what the problem might be.
Ask them if they will check it for free.
Most dealerships and other places do quick/initial diagnosis (run computer tests to see exactly what is triggering the alarm) for no money as they plan to make money for the repair of your vehicle.
If you’re Ford is still under warranty then they should fix and resolve the issue for free.
Check for Recalls or TSBs:
By entering your car’s VIN number on Ford’s recall page or the NTHSA’s Safety Issues & Recalls page you can determine whether or not there is a TSB or recall for your vehicle and if there is you’ll want to get it addressed.
A recall is issued by a vehicle manufacturer for issues that are safety-related, while a TSB covers components that may be malfunctioning but don’t compromise the safety of the vehicle.
Diagnosing Faults With a Scanner
Another possible option if you’re having alarm issues is to use an OBD2 diagnostic scanner tool, this can help narrow down what is causing the alarm.
These are fairly easy to use, you simply plug them into your car – there’s usually an OBD2 port under the steering wheel.
Once you have the scan codes you can research these online specifically for the Edge.
There are also OBD apps available so you can connect your car straight to your smartphone (either with a cable or Bluetooth) without even needing a scanner.