Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?
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2009-2014 Cadillac CTS-V General Discussion Discussion, Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon? in Cadillac CTS-V Series Forum - 2009-2014; Voltage ran 14.9-15.0V the whole way to work this morning. Battery likely to die soon? It is about 4 years ...
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    Mr. LCP is online now Cadillac Owners Fanatic
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    Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Voltage ran 14.9-15.0V the whole way to work this morning. Battery likely to die soon? It is about 4 years old and we've had the first cool mornings of fall the last two days.

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    Mr. LCP is online now Cadillac Owners Fanatic
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    Voltage was down in the 13's and 14's on the way home.

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    Cadillac Cust Svc's Avatar
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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Mr. LCP, have you had a chance to connect with your dealership yet regarding your concerns? I did some research for you and, according to my GM resources, the "Battery Voltage" display may fluctuate when viewing this information on the DIC. And this is normal.

    If there is a problem with the battery charging system, your charging system light illuminates and/or the DIC displays a message. Have you received any such message? See the "Charging System Light" section of your owners manual on page 3-38, DIC Warnings and Messages on page 3-58 and Electric Power Management on page 3-21 for more information. I'm also available for further assistance anytime via email (Katie_Lucille@gmexpert.com).

    Best,

    Katie
    Cadillac Customer Service

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    hanch04 is offline Cadillac Owners Member
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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    I've noticed the same thing in my 2010 CTS-V, 29k miles. My voltage is all over the place but I have not seen any warnings. It runs at 15.1v, 15.2v, then down to 14.5v and if I've driving for over an hour it goes down to 12.8v. If I stop and restart the car it goes back to 14.5v. I don't know how long it's been doing it but I just started watching. I've not had any starting issues (yet). Is this a normal voltage swing for these cars? Or is there a problem? Again, I've not seen any warning messages and I've not been to a dealer yet.

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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Hanch, if you don't mind sending me an email with the last eight of your VIN, I can investigate further for you. While I'm not on duty this weekend, I will be back in the office Monday at 8am EST and will make sure to check my accumulated messages then!

    Katie
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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    14-15ish is totally normal.... the alternator is doing its job. As long as it stays over twelve you're good to go. In my experience it SHOULD be reading 14-15ish.

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    This is perfectly normal and in fact you will see voltage drop to 12.5 or so. The new alternator systems GM started using will turn itself on and off as needed to save on fuel mileage and unnecessary charging. The Camaro's and trucks do the same thing. If its been off for a bit the voltage will ramp up high once it starts charging again.

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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Have you guys verified the DIC reading with a voltmeter at the battery also?

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    jft69z is online now Cadillac Owners Fanatic
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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Quote Originally Posted by RoketRdr View Post
    This is perfectly normal and in fact you will see voltage drop to 12.5 or so. The new alternator systems GM started using will turn itself on and off as needed to save on fuel mileage and unnecessary charging. The Camaro's and trucks do the same thing. If its been off for a bit the voltage will ramp up high once it starts charging again.
    Quote Originally Posted by Houdini View Post
    14-15ish is totally normal.... the alternator is doing its job. As long as it stays over twelve you're good to go. In my experience it SHOULD be reading 14-15ish.
    Absolutely correct. If you still need verification I can post the theory of operation directly from the GM eSI manual.

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    Haze is offline Cadillac Owners Member
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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Yeah, that's normal operation and anything over 12 is OK. What you are noticing is the voltage regulator adjusting to the needs of the charging system. As the battery is completely charged, the regulator shuts out further charging power from the alternator. Totally normal.

  12. #11
    hanch04 is offline Cadillac Owners Member
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    Re: Voltage ran 14.9-15.0V the whole way to work today. Battery likely to die soon?

    Thanks guys. I appreciate the responses. I guess I'm just used to the "old school" GM charging systems working at about 14.0v all the time and I was hoping the charging system wouldn't fry everything in the vehicle.

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