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Replace the battery. The distance that the keyfob will transmit falls off as the battery depletes. The distance to the door and start button are a lot closer than the trunk to the start button.
 

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2018 PHEV Touring Atlanta, GA
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Replace the battery. The distance that the keyfob will transmit falls off as the battery depletes. The distance to the door and start button are a lot closer than the trunk to the start button.
I think there is a key sensor in the trunk area also. At least in the Clarity, don't know about the Civic. In fact I think I remember someone saying there are three sensors in total. But still could be a weak fob battery, that would certainly be the easiest thing to try first.
 

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I always have a spare fob in the trunk. I wrap it in tinfoil to block the signal and put the door key somewhere on the outside of the car (behind the license plate if the plate bracket has a small indent). The fob and program isn't cheap, but It's a lot cheaper than having to tow the car to the dealership and pay for the same thing anyway.
 

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2018, Honda, Clarity PHEV Touring
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296 Posts
My son got locked out of the Clarity, had put his bag along with the key in the trunk and closed it. I had to bring the spare and unlock it. Betting it's low battery he did not mention any concern probably just starting to get weak...
 

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2018, Honda, Clarity PHEV Touring
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Hmm...

First I tried the other key:

locked the doors with the remote
put the key in the trunk in the center on the sloped part
closed the trunk after which beeps and pops back open

I left that other key on the outside opposite side of the house where I'm sure the sense would not sense it. I did the same test with his key sans the laptop bag, and it did the exact same thing. Battery not low it seems, maybe shielding like the foil wrap...
 

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2018, Honda, Clarity PHEV Touring
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A few days ago my son complained that the door did not unlock when touched on occasion. I popped out the battery and measured the voltage with a multimeter compared to a new one.

Old: 3.0x V
New: 3.3x V

I asked if the car warned of a low battery, and he said he didn't think so. I replaced it and so far so good. (I did notice last time I replaced a low battery with warning it was in the 3.0x V range so I told him it's about time to change it anyways)...
 

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2021 PHEV Touring HB, CA
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702 Posts
A few days ago my son complained that the door did not unlock when touched on occasion. I popped out the battery and measured the voltage with a multimeter compared to a new one.

Old: 3.0x V
New: 3.3x V

I asked if the car warned of a low battery, and he said he didn't think so. I replaced it and so far so good. (I did notice last time I replaced a low battery with warning it was in the 3.0x V range so I told him it's about time to change it anyways)...
I finally bit the bullet, and bought the battery tester recommended here (by 2002?). It tests a couple dozen battery types under load. Works like a champ, to identify weak batteries. Pricey, though.

 
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