Battery keeps going dead - JeepForum.com
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post #1 of 10 Old 09-02-2019, 10:30 AM Thread Starter
T888
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Question Battery keeps going dead

I have a 2016 Grand Cherokee 75th anniversary edition 3.6 upgrade (with stop/start) with an electrical problem. Battery completely dead, would not start with portable power pack, or with jumpers cables from another vehicle. I bought and installed new battery, ran fine for 1 day, then completely dead/drained. Towed to dealer, they replaced both batteries, alternator , and power control module and ran fine for 3 days. Completely dead again, towed back to dealer, they found a 1 mil amp drain on battery while sitting, normal draw and no evidence of excessive draw. They charged it up, let it sit on lot for 3 days, starting it everyday with no problem, I picked it up and it went for 2 days, and dead again. I attempted to start with battery pack, and also jump with other vehicle and it would not start. Towed back to dealer.

Waiting on it now. Does this seem familiar to anyone?

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post #2 of 10 Old 09-02-2019, 10:42 AM
ColdCase
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It the battery dead at its terminals, or does the Jeep just not turn over? There is a IOD fuse and current/voltage sensor in the battery cable/connector that can go bad/intermittent.

Otherwise, perhaps a loose ground or other electrical connection that, as you drive around, bumps loose over time. Perhaps a pushed pin somewhere.

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post #3 of 10 Old 09-02-2019, 02:00 PM
Nejeep
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Starting normally at the dealer but not at home means something must be different. Was it garaged or outside, locked or unlocked, remote started or push button?
Where do you keep your key fobs when parked at home? If it is within a few feet (5-10) of the Jeep, the control modules may not go to sleep and will drain the battery.
The no start with a jumper pack/cables is also strange. Is it totally dead (no clicks & no dash lights), just a no-crank or crank but no-start condition?
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post #4 of 10 Old 09-03-2019, 11:48 AM
howardusa
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Quote:
Originally Posted by Nejeep View Post
Where do you keep your key fobs when parked at home? If it is within a few feet (5-10) of the Jeep, the control modules may not go to sleep and will drain the battery.
Interesting. Didn't know that. Thanks for the information. It's never happened to me but I will be more cautious as to where I place the key fob. I would have never thought of that in a million years if my battery kept going dead.
HT
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post #5 of 10 Old 09-03-2019, 01:46 PM
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Quote:
Originally Posted by T888 View Post
I have a 2016 Grand Cherokee 75th anniversary edition 3.6 upgrade (with stop/start) with an electrical problem. Battery completely dead, would not start with portable power pack, or with jumpers cables from another vehicle. I bought and installed new battery, ran fine for 1 day, then completely dead/drained. Towed to dealer, they replaced both batteries, alternator , and power control module and ran fine for 3 days. Completely dead again, towed back to dealer, they found a 1 mil amp drain on battery while sitting, normal draw and no evidence of excessive draw. They charged it up, let it sit on lot for 3 days, starting it everyday with no problem, I picked it up and it went for 2 days, and dead again. I attempted to start with battery pack, and also jump with other vehicle and it would not start. Towed back to dealer.

Waiting on it now. Does this seem familiar to anyone?
Please keep us updated on your dealer’s findings, T888. If we can be of any additional assistance, we’d be happy to help. We’re just a PM away.

Mark
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post #6 of 10 Old 09-07-2019, 10:57 PM Thread Starter
T888
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Thanks for the help on this, the dealer thought that it was a key fob issue as well, it went dead one time at work and the key fob was not there. When it was dead, there was nothing, no power. It has been repaired, took the dealer days to diagnose the problem, it was a defect in a fuse box under the hood that would energize the ac compressor clutch intermittently, even when the jeep was off/parked. The constant power supply to the clutch would completely drain the battery.
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post #7 of 10 Old 09-07-2019, 11:20 PM
ColdCase
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Thanks for the follow up. A new failure mode for me

Some people think I'm stupid and I totally disagree. But my biggest fear is that me thinking I'm smart proves them right.....
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #8 of 10 Old 09-07-2019, 11:54 PM
96GrandJeepers
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T888 ~ Thank you for posting a possible solution to a (hopefully) very unusual problem.

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post #9 of 10 Old 09-09-2019, 02:14 PM
MarkSRT8
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I leave the FOB in a cup holder overnight in my garage and when on vacation and never had a problem with the battery draining.
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post #10 of 10 Old 09-09-2019, 04:17 PM
Bilko
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What's your address
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