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Discussion Starter · #1 ·
We have a 2018 Clarity which is mostly used for daily local driving with the occasional longer distance trip. We have brought it in for all recommended services at the dealer including a recent one. The car has not given us any problems to this point. We have a Chargepoint Level 2 charger in our garage.

Generally, when traveling a longer distance trips, the behavior is that the battery runs down to two bars then the gas engine starts running much of the time. This makes sense.

Yesterday, this behavior changed. At about 35 miles out on the highway, I was using their adaptive cruise when I came up behind a rather slow vehicle. I moved to overtake, and instead of the car speeding back up to the limit, it lost significant power to the point I felt the need to press on the accelerator aggressively. When I did so, the engine came on very loud, much louder than I ever remember, and the car recovered speed. The engine stayed on very loud and the battery charge dropped to one bar then zero bars. I have never seen the battery go below two bars. I pulled off at the next rest stop, shut down and restarted, and used the HV charge mode. The battery did charge seemingly normally. We got to our destination before the charging reached its limit.

On the return trip the same thing happened but I wasn't overtaking. The battery again went to zero bars with the engine loud. I went back to HV charge and completed the trip. The battery reached 60% charge (as reported by the app) and a message was displayed that charging was stopped and could be completed with a charger.

Conditions were nominal. Not especially cold, not using heated seats, nothing unusual.

My question is, is this normal, perhaps the dealer updated software, or is something wrong and needs immediate attention. As I mentioned, this is the first time I have seen the battery charge go to zero bars.
 

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This is unusual to say the least.

Never have I seen the charge bars go below 2 bars.

I have had the engine rev up like buzzing hornets but that's because the battery ran out (2 bars) and the A/C was running on high.

Might be worth taking it to the dealer for a diagnostic ?
 

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We have a 2018 Clarity which is mostly used for daily local driving with the occasional longer distance trip. We have brought it in for all recommended services at the dealer including a recent one. The car has not given us any problems to this point. We have a Chargepoint Level 2 charger in our garage.

Generally, when traveling a longer distance trips, the behavior is that the battery runs down to two bars then the gas engine starts running much of the time. This makes sense.

Yesterday, this behavior changed. At about 35 miles out on the highway, I was using their adaptive cruise when I came up behind a rather slow vehicle. I moved to overtake, and instead of the car speeding back up to the limit, it lost significant power to the point I felt the need to press on the accelerator aggressively. When I did so, the engine came on very loud, much louder than I ever remember, and the car recovered speed. The engine stayed on very loud and the battery charge dropped to one bar then zero bars. I have never seen the battery go below two bars. I pulled off at the next rest stop, shut down and restarted, and used the HV charge mode. The battery did charge seemingly normally. We got to our destination before the charging reached its limit.

On the return trip the same thing happened but I wasn't overtaking. The battery again went to zero bars with the engine loud. I went back to HV charge and completed the trip. The battery reached 60% charge (as reported by the app) and a message was displayed that charging was stopped and could be completed with a charger.

Conditions were nominal. Not especially cold, not using heated seats, nothing unusual.

My question is, is this normal, perhaps the dealer updated software, or is something wrong and needs immediate attention. As I mentioned, this is the first time I have seen the battery charge go to zero bars.
My 2018 Clarity displayed similar issues about a year ago. I disconnected the negative terminal from the 12 volt battery for around 15 minutes and then reconnected it. The issue has not returned. I'm guessing the computer wanted to be rebooted.

BTW... All of the warning lights on your instrument panel will illuminate like Times Square on New Years Eve. After driving about 1 mile everything reset and the warning lights went out.
 

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Discussion Starter · #8 ·
LenH, that's interesting.

We did bring it in to the dealer. They found no stored DTCs and drove it around and found nothing abnormal. Obviously they didn't drive it until the battery was depleted though.

I'm wondering if I should do a reboot like you did or wait until it happens again? I didn't speak to the tech but he may have issued a reset command.
 

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This sounds like a failing battery cell. I've seen my wife's Clarity drop to 1 bar from mountain driving and the result is that the engine races and you have no power. The fact that yours dropped quickly is a sign that either the battery has one or more failing cells or the computer that manages the battery is failing.
 
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