[NoelinColorado]

Modern cars do a self test of the fuel system by pressurizing the fuel tank. You may have heard that process. It kind of freaked me out the first time I heard my 2018 CRV doing it.

The humming being related to the MM could well have been a red herring.

 

[old timer]

I don't quite understand the great concern on the battery voltage. After three days with no activity on the car, my battery is at 11.5V. I am not concerned. A full battery is 12.6v. When I see 10v, I will be concerned. When I start (ready) the machine, the battery voltage will go to 14.3v or.4. Parasitic draw is there, and that is a fact. I believe that as long as it is not an external draw the car will function just fine. My rav is 11 months old and has sat for up to a week with no external connection and starts just fine. FWI

 

[NoelinColorado]

I don't quite understand the great concern on the battery voltage. After three days with no activity on the car, my battery is at 11.5V. I am not concerned. A full battery is 12.6v. When I see 10v, I will be concerned. When I start (ready) the machine, the battery voltage will go to 14.3v or.4. Parasitic draw is there, and that is a fact. I believe that as long as it is not an external draw the car will function just fine. My rav is 11 months old and has sat for up to a week with no external connection and starts just fine. FWI

I guess the concern has come from a few here w/ dead batteries that were not very old. It is great to know 11.5V is not a problem with this car. Several articles I read suggest that is almost too low to start 'a car' with.

 

[Marctaylor15]

I don't quite understand the great concern on the battery voltage. After three days with no activity on the car, my battery is at 11.5V. I am not concerned. A full battery is 12.6v. When I see 10v, I will be concerned. When I start (ready) the machine, the battery voltage will go to 14.3v or.4. Parasitic draw is there, and that is a fact. I believe that as long as it is not an external draw the car will function just fine. My rav is 11 months old and has sat for up to a week with no external connection and starts just fine. FWI

I agree. They use AGM batteries in the Prime, which is more of a deep-cycle battery. It should be able to handle the standard parasitic load, unless there is a firmware issue. There was one, but it should have been fixed on all cars by now.

 

[old timer]

Unfortunately, the 12v battery is a closed lead acid, not an AGM.

 

[Marctaylor15]

Unfortunately, the 12v battery is a closed lead acid, not an AGM.

That's unfortunate. I had heard it was an AGM. The next battery the car gets will be an AGM! 😁

 

[slab]

4h later my wife hears a funning hum coming from the car when she went out into the garage for something. I went out, retested voltages, now 12.09v.

If it was somewhere around ~5 hours after running it, it was likely the fuel evap leakage check. The sound is oriented underneath towards the rear of the vehicle. As per the attached and based on my experience, it will run for several minutes.

 

[NoelinColorado]

If it was somewhere around ~5 hours after running it, it was likely the fuel evap leakage check.

Odd it stopped upon my disconnecting the multimeter but who knows R4P is clearly a slithy tove that does gyre and gimble in the wabe...

 

[Storm_Trooper]

Odd it stopped upon my disconnecting the multimeter but who knows R4P is clearly a slithy tove that does gyre and gimble in the wabe...

Noel in Colorado: "Beware the Jabberwock, my son. The jaws that bite, the claws that catch!