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Discussion Starter · #1 ·
Hello, I have a 2018 Civic with 70,000 miles. In August I went to start the car and it wouldn’t start. Ended up getting a jump and drove it to the nearest mechanic. They misdiagnosed the car by saying it needed an alternator replacement when really all it needed was a new battery. I took it to the dealership immediately after where they replaced the battery (also tested the alternator and determined it was good). After driving the car the check charging light came on. I called the dealership and my car has been in and out with them since August. They can not figure out what exactly is wrong. They finally determined it was the battery sensor and replaced it. Once I started driving it, the message came back on so that’s not the issue. Anyone else experienced the mechanics at the dealership not being able to determine the issue?
 

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Photoshop Masta
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Search the forum as I've seen many threads regarding this issue. Read through them and you'll find various issues that could cause that light to come on.
 

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Discussion Starter · #3 ·
Thanks, and I have. I even mentioned each possibility that I’ve read. Especially the car locking up and not being able to start at all. I’m not car savvy when it comes to mechanical issues.
 

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Photoshop Masta
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Yeah I figured what when you wrote you went to the dealer to get a new battery. Nothing wrong with not knowing, but it's always important to do your research (here) before you start throwing parts at the car, especially if you take it to the dealer, they'll recommend a new engine if they knew you'd be willing to pay for one.
 

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You may have more than one issue. There’s no way the dealer doesn’t know what’s wrong. You initially came in for a check charging system message on. Now the traction and other lights are on? We need the full story.

Those other lights might be related to what you have or they may not. Have a different dealer diagnose it or have the same dealer get an electrical specialist diagnose it.

My money is on an animal chewing on a couple of wires.


Sent from my iPhone 13 Pro while on the toilet.
 

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Discussion Starter · #8 ·
You may have more than one issue. There’s no way the dealer doesn’t know what’s wrong. You initially came in for a check charging system message on. Now the traction and other lights are on? We need the full story.

Those other lights might be related to what you have or they may not. Have a different dealer diagnose it or have the same dealer get an electrical specialist diagnose it.

My money is on an animal chewing on a couple of wires.


Sent from my iPhone 13 Pro while on the toilet.
The first place which is just a local mechanic shop said I needed a new alternator. I let them replace it and the car wouldn’t even stay on and all of these lights were on at the time. I would start it and not be able to start it again once I turned it off. I ended up getting a refund and they put the old alternator back in (dealer confirmed) which I then took it to the dealership where they said I had a bad battery. They replaced the battery, but they can’t get the sensor lights to turn off. I feel like the local mechanic did something to the car since they had to refund me for the labor and alternator which they really didn’t want to do. I don’t know anything about cars so I wouldn’t know. I at least thought the dealer would know since they are trained for this.
 

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What did you tell the dealer what your issue was? A no start? Or check charging system light is on? 2 separate concerns that they might have wanted 2 separate diag fees for. Did the battery take away all the other lights sans check charging system?


Sent from my iPhone 13 Pro while on the toilet.
 

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Discussion Starter · #10 ·
What did you tell the dealer what your issue was? A no start? Or check charging system light is on? 2 separate concerns that they might have wanted 2 separate diag fees for. Did the battery take away all the other lights sans check charging system?


Sent from my iPhone 13 Pro while on the toilet.
The dealer said it was was a dead battery and they changed it. They claimed this solve the issue and they reset all the sensors. They were off for a day and came right back on the next day— check charging, brake system, and steering wheel. I called them and they told me it was the battery sensor and replaced it last week (the part was on back order). After an hour of driving all lights were flashing, again. I was told to bring it back this morning.

When I go I speak with the advisor and they relay the message from the highest level mechanic they have back to me when they’re finished. They never mention anything in detail and they seem to not know what the issue is at all. They just repeatedly tell me how they’ve never seen this issue, but what they’ve recommended will fix it. I have an another appointment at a dealership in another state at the end of the week.
 

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Discussion Starter · #12 ·
No, this dealership seems helpful and wants to help you. Give them more time. Don't bring it to another dealer just yet. Let their foreman figure it out.
They finally determined it was the alternator and will be replacing it. They said the reason why all of this happened (with the sensor lights) was because the local mechanic shop put on a an alternator that was not a Honda one.
 

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Brand new Denso or Remanufactured by Denso is the only alternator that should be installed as a replacement in any Honda or Acura.

I've been through parts store remanufactured alternator once, where they rebuilt a Denso alternator, but not correctly. It lasted for one day. Never again.

Every Remanufactured by Denso alternator I've used has always worked.

OF
 

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Discussion Starter · #14 ·
Brand new Denso or Remanufactured by Denso is the only alternator that should be installed as a replacement in any Honda or Acura.

I've been through parts store remanufactured alternator once, where they rebuilt a Denso alternator, but not correctly. It lasted for one day. Never again.

Every Remanufactured by Denso alternator I've used has always worked.

OF
 

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Discussion Starter · #15 · (Edited)
Good to know. I’m just confused on how an alternator goes out in 3 years of having the car when I always gotten it serviced and never had any sensor lights initially. I’m still driving the car as if nothing is wrong. People are saying they can’t even start their car when the alternator goes bad.
 

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I Need A Vacation
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Good to know. I’m just confused on how an alternator goes out in 3 years of having the car when I always gotten it serviced and never had any sensor lights initially. I’m still driving the car as if nothing is wrong. People are saying they can’t even start their car when the alternator goes bad.
Could be a weak battery that killed the alternator. My OEM battery died after only 2.5 years. 9thgen OEM Civic batteries were known to be weak.
 
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