2017~2021 Rear hatch opening by itself?

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CX5
I really wouldn't worry about it. This involves a tiny number of people, and of that tiny number, most probably caused the issue by an accidental push of the button. I was curious though, so I called the service manager at my Mazda dealership yesterday afternoon, and he's never heard about this issue. He called two other service managers in the area, and they hadn't heard about it either. My service manager did tell me that he did have one customer with a locking mechanism failure, and the dealership replaced the locking assembly.
 
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Pueblo county CO
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CX-5 Sport 16.5 6M
It would suck if you left it parked for a couple of weeks, like at an airport, and you came back to an opened hatch or unlocked doors.

I wonder if you could pull a fuse to disable it? It would be extra trouble to open with the emergency key.
 

sm1ke

Work In Progress..
Moderator
Contributor
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Canada
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'18 CX-9 Signature

There’re reports and based on my own experience this auto-locking feature on the CX-5 won’t happen 100% of time which may leave us in an undesired situation with unlocked vehicle. I have to pay attention making sure I hear the first beep, otherwise I take my key fob out and lock the CX-5 “manually”.

With auto-folding mirrors, that should be easier to verify if the CX-5 is auto-locked or not.
The auto-locking feature works very well. I think a lot of people had/have issues with it because they set expectations without actually knowing how the feature works.

It should always lock the doors automatically if the keyfob is within range of the proximity sensors when the last open door is closed. If the fob is in range, the system will prime itself (one audible beep after the door closes). When the fob exits the proximity sensor's range, the car beeps again and locks all doors automatically.


If the doors do not lock after the system is primed, or if the system does not prime when the fob is still in range, then there is an actual problem with the auto-locking system.
 
This is very concerning. I drive a 2017 (GT w/Tech) while my brother drives a 2018 (GT w/Tech as well). One time he complained that when he went down to his driveway in the morning, he was surprised to find the rear hatch open. I dismissed him and didn't think much of it. A few months later he complained about the same thing again, and again I dismissed him.

Last night, I parked my car at the grocery store, clicked the lock button on my fob. Upon returning some 15 mins later I was horrified to see my rear hatch wide open. I often have about $25,000 worth of photography gear in there (yea, I know I shouldn't) so this really freaked me out.

I know for a fact that I did not open the hatch with the button inside the car or the fob. In order to open the hatch with the fob, the open hatch button (which is near the bottom of the fob as opposed to the top for the door lock function) needs to be pressed for 2 seconds or so and an audible sound is heard. I definitely didn't have any buttons pressed for an extended time and I definitely did NOT hear any beeping sound. Also, I was facing a huge glass window and had I triggered the open hatch function, I would see the reflection of the hazard lights in the window in front of me which are also triggered when opening the vehicle. Also, while in the grocery store, there is NO way I would've accidentally pressed AND HELD the open hatch button. The fob was dangling from my finger by its ring the entire time.

Doing some research, I found this:

https://www.reddit.com/r/CX5/comments/6wmgwf
The people responding to the OP in that post suggest it's the key fob, but from my own experience I know there was no way I could've triggered it by hitting AND HOLDING the open button.

Anyone else experience this? This could potentially be a big issue. We leave things in our cars and this could lead to serious loss of personal property.

I'm awaiting any input from other owners.

Regards
I have had this happen multiple times within 1 year. I have taken a picture 3x and dated it. My dealer also said they've never heard of hatch opening on its own. I leased a Cx-5 Sept 2019. There are many threads talking about this issue. I've written Mazda via email and they also say they haven't seen any recalls relating to this....perhaps that is the case but it is still happening. What do we do?
 

sm1ke

Work In Progress..
Moderator
Contributor
:
Canada
:
'18 CX-9 Signature
I have had this happen multiple times within 1 year. I have taken a picture 3x and dated it. My dealer also said they've never heard of hatch opening on its own. I leased a Cx-5 Sept 2019. There are many threads talking about this issue. I've written Mazda via email and they also say they haven't seen any recalls relating to this....perhaps that is the case but it is still happening. What do we do?
This is the procedure for escalation as outlined in the manual:

The best chance to get your mysterious problem fixed is to take your CX-5 to your Mazda dealer. If they can’t help you, you escalate this issue to Mazda North American Operations and create a case. Tell them it’s a safety issue and ask them to find out if there’s a solution yet with a Service Alert or Technical Service Bulletin.
When contacting MNAO, use this contact info and follow these steps (which were cut and pasted from the owner's manual):

E-mail: click on “Contact Us” located on the bottom of the page at www.mazdausa.com under “Help”

By phone at: 1 (800) 222-5500

By letter at:
ATTN: Customer Experience Center
Mazda North American Operations
200 Spectrum Center Drive Suite 100
Irvine, California 92618
P.O. Box 19734
Irvine, CA 92623-9734

In order to serve you efficiently and effectively, please help us by providing the following information:
1. Your name, address, and telephone number
2. Year and model of vehicle
3. Vehicle Identification Number (17 digits, noted on your registration or title or located on the upper driver's side corner of the dash)
4. Purchase date and current mileage
5. Your dealer's name and location
6. Your question(s)


Following that, if you aren't satisfied with your experience with MNAO, you would then file a complaint with the BBB (info also located in the owner's manual).

In the meantime, while the issue is being dealt with, you can do the following to test/prevent the rear hatch from opening when you don't want it to:
https://www.amazon.com/s?k=Faraday+Box&ref=nb_sb_noss_2&tag=m20b7-20?tag=m20b7-20

You could keep your fobs in a faraday box or bag/pouch when you're home or at work to block the fob from sending unintended signals to the car.

For users experiencing this problem, you can determine whether the problem is fob-related by placing your key fob in a faraday pouch right after you lock the vehicle. If you no longer come back to a car with the hatch open over a long enough period of time, you can safely assume that the problem is fob-related. If the hatch continues to open on it's own while the fob is secured in a faraday pouch/box, it's likely a problem with the car itself (BCM, power liftgate module) or RF cross-transmission (or possibly a latching mechanism issue as TDK1044 mentioned).
 
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2019 CX-5 Signature
Has happened to my wife a couple of times. It is most certainly the fob being inadvertently activated. There are a few threads on it in the forum.
 
Has happened to my wife a couple of times. It is most certainly the fob being inadvertently activated. There are a few threads on it in the forum.
That's what I assumed first few times but it's impossible due to distance from vehicle. Someone suggested I purchase a fob protector on amazon for 12.99 which I will do to see if that eliminates the issue. Your wife may want to try this as well.
 
This is the procedure for escalation as outlined in the manual:

When contacting MNAO, use this contact info and follow these steps (which were cut and pasted from the owner's manual):

E-mail: click on “Contact Us” located on the bottom of the page at www.mazdausa.com under “Help”

By phone at: 1 (800) 222-5500

By letter at:
ATTN: Customer Experience Center
Mazda North American Operations
200 Spectrum Center Drive Suite 100
Irvine, California 92618
P.O. Box 19734
Irvine, CA 92623-9734

In order to serve you efficiently and effectively, please help us by providing the following information:
1. Your name, address, and telephone number
2. Year and model of vehicle
3. Vehicle Identification Number (17 digits, noted on your registration or title or located on the upper driver's side corner of the dash)
4. Purchase date and current mileage
5. Your dealer's name and location
6. Your question(s)

Following that, if you aren't satisfied with your experience with MNAO, you would then file a complaint with the BBB (info also located in the owner's manual).

In the meantime, while the issue is being dealt with, you can do the following to test/prevent the rear hatch from opening when you don't want it to:
I'll buy the fob protector to test it out. I have already emailed Mazda so I will also contact MNAO. Thanks.
 

Bird-Dog

2017 CX-5 Touring 2020 CX-5 GTR
I'm curious what sort of location the car was in when this happened. If in a crowded parking lot I'd have to wonder if it was picking up someone else's signal.
 
I'm curious what sort of location the car was in when this happened. If in a crowded parking lot I'd have to wonder if it was picking up someone else's signal.
1. Parked across the street, a very wide blvd - I was in office building 7 floors up 2. In outdoor shopping center, parked along end of lot, far from my shopping area 3. Parked on residential cul de sac 5 houses away from my location.
 
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