Low voltage battery light on - 2014+ Jeep Cherokee Forums
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post #1 of 10 (permalink) Old 11-25-2015, 04:08 PM Thread Starter
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Low voltage battery light on

Hi All,

I have been reading other post about this but couldn't find anybody with the same situation.

As I have been at the dealership at least 2 times per week and still can't find an answer I would like to see if anybody can help me.

I have a 2014 Trailhawk, I love this car but I'm having the following problem:

In the mornings when I start the car and the engine is running the battery light comes on and the voltage is 11.8 or 11.7, after a few minutes, 2 or 3 the voltage goes up to 14.0 but the light stays on until I turn the engine off. The light does not come up ever during the day.

I took it to the dealership and they change the alternator, next day same thing happened.
I left it at the dealership overnight but they left it inside of the shop and didn't happened again.
Next day same thing happened and took it again, they changed the PCM.
Next day, same thing happened and 1 day ago they changed the ECM.
Today, same thing happened, they told me they don't know what it is may be is a software issue but we have to wait because they have done all that Chrysler said about the low voltage. Also mention the Recall 39 that has something to do with the body control module ?????
Car runs perfect, the engine light has never turn on, no other problems.
Any ideas, or anybody with the same problem?
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post #2 of 10 (permalink) Old 11-25-2015, 04:12 PM
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Did the dealer load test the battery? Almost sounds like a bad cell in the battery, or even a bad connection
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post #3 of 10 (permalink) Old 11-25-2015, 04:18 PM Thread Starter
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They said they tested the battery and is ok, when the car is off the battery voltage is 12.6
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post #4 of 10 (permalink) Old 11-25-2015, 05:21 PM
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The battery voltage can be 12.6 with no load and still fail under a load test. The load test will reveal MOST faulty batteries, if a battery has a loose plate inside it can have an intermittent fault and pass a load test, it just depends on the circumstances when they test it. It could be a number of things but I agree with @ptrudel it does sound like a bad connection. Unfortunately that "loose connection" could be anywhere, including inside of a module.

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post #5 of 10 (permalink) Old 11-25-2015, 05:31 PM
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does low voltage red light go off when volts are normal? or is it just the dash warning message that stays on?..
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post #6 of 10 (permalink) Old 11-25-2015, 09:05 PM
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switch it to a different screen display
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post #7 of 10 (permalink) Old 11-25-2015, 09:29 PM Thread Starter
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No it does not go off when the voltage reach a normal value (14V), stays on until I turn the vehicle off. If I start it again then the light does not comes again during the day.
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post #8 of 10 (permalink) Old 11-25-2015, 09:30 PM Thread Starter
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I did change to a different screen and is still there when I come back to the voltage screen and the main screen.
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post #9 of 10 (permalink) Old 11-25-2015, 09:32 PM Thread Starter
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Quote:
Originally Posted by Gersh View Post
The battery voltage can be 12.6 with no load and still fail under a load test. The load test will reveal MOST faulty batteries, if a battery has a loose plate inside it can have an intermittent fault and pass a load test, it just depends on the circumstances when they test it. It could be a number of things but I agree with @ptrudel it does sound like a bad connection. Unfortunately that "loose connection" could be anywhere, including inside of a module.
So you are suggesting that if it is a bad connection will be very difficult to find? The TH only have 38,000 Km still under warranty, any suggestions?
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post #10 of 10 (permalink) Old 11-26-2015, 10:01 AM
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Be persistent, shops have several tools available to "record" intermittent problems. If the issue is the same every day they should be able to diagnose it. They need to figure out if the voltage is actually low or if the battery light is is coming on when it shouldn't be. Its odd that your EVIC shows the battery is charging and the battery light stays on. I would lean towards a bad battery. There are 6 cells in a battery connected in series, each cell is responsible for 2.1v. A battery with no load on it should show roughly 12.6v. The rule of thumb for testing a battery is you load the battery to 1/2 of CCA for 15 seconds, if the voltage drops below 9.6v in the time the battery is a fail. There is the often forgotten required voltage before the load test is started and the ending voltage after the test. The battery has to recover to approx 12.6v, if it doesn't it is a fail also. Good luck, I hope this helps!
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