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Beeping noise while driving

Tiny
GEERAD2000
  • MEMBER
  • 2004 TOYOTA PRIUS
  • 1.5L
  • 4 CYL
  • AUTOMATIC
  • 265,555 MILES
My car runs great, but while I am driving it continuously beeps. I recently replaced the the electronic water pump and the coolant control valve. I have used a scanner and it indicated no codes. Plus, I just had my car smogged yesterday and it passed.

The beeping sounds like three beeps every five to ten seconds and is continuous.
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Saturday, June 24th, 2017 AT 10:18 PM

7 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,577 POSTS
The normal reason for thee beeps is to tell you that it is in full EV mode if you are under 41 mph. However that should only happen when the screen switches to EV and the engine shuts off, not constantly.
The next reason is that the vehicle thinks you exited the vehicle with it in ready mode but the fob is with you.
The second one can happen if there is a cell phone close to the fob OR the fob has a weak battery or is inside something that blocks the signal, like one of the wallets or purses that has a lining that prevents ID theft.

Another possibility is a bad door latch switch that makes the car think a door is open.

There is also the possibility that it is something to do with the EV controller getting a false signal, for that you would need a factory scan tool and access to OEM programming options so you could test the system.
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Monday, June 26th, 2017 AT 2:53 PM
Tiny
GEERAD2000
  • MEMBER
  • 4 POSTS
Actually it is 2 beeps sorry about the mistake.
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Tuesday, June 27th, 2017 AT 12:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you need to run the codes to see what is going on.

Here is a guide to show you how.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run this test and get back to us we are interested to see what it is.

Cheers, Ken
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Thursday, June 29th, 2017 AT 10:53 AM
Tiny
GEERAD2000
  • MEMBER
  • 4 POSTS
There is no check engine light and I have used multiple code readers and no codes show
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Saturday, July 1st, 2017 AT 1:50 AM
Tiny
KEN L
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  • 48,363 POSTS
It sounds like a warning for the main (big) battery can you roll through the information screens to see of anything is red?
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Sunday, July 2nd, 2017 AT 6:50 PM
Tiny
GEERAD2000
  • MEMBER
  • 4 POSTS
. The Hv battery was replaced about 2 years ago, so I did not think that could be a cause. I will definitely check and post an update.
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Tuesday, July 4th, 2017 AT 12:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Tuesday, July 4th, 2017 AT 11:27 AM

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