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04-19-2022, 07:42 AM | #1 |
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MPG clears on its own
My average fuel economy has been clearing on its own when I turn the car off. When I restart, it's blanked out as if I manually did it. Doesn't happen all the time…maybe 50% of the time. Is there some kind of hub battery for the OBC?
Thanks
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04-20-2022, 01:32 AM | #2 |
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Car's battery is probably on it's way out. My OBC was resetting itself every time I started the car (among other issues), replacing the battery fixed it.
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04-20-2022, 09:31 AM | #3 | |
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Quote:
. https://www.m3post.com/forums/showthread.php?t=1737565 . https://www.m3post.com/forums/showpo...85&postcount=4 .
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Last edited by DrFerry; 04-20-2022 at 09:38 AM.. Reason: Added Good Battery Resting Voltage Photo |
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04-26-2022, 03:55 PM | #4 |
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Yes, this! I had this started on me recently (trip and clock resetting) and it turned out to be my battery needing replacement. No more issue after the replacement.
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06-03-2022, 10:45 AM | #5 | |
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Quote:
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06-03-2022, 10:18 PM | #6 |
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Less than year old battery shouldn't give you this issue. However, just to be safe, you can test the battery using a tester from autozone or other car parts stores. I purchased a battery charger that has the tender and diagnostic features from advanced autoparts for something around $30. Upon hooking up the battery to charge, the device displayed a sign that indicated faulty battery. I believe my old battery was about 3 years old based on the date on the battery. So I replaced it, coded to new battery spec (used Protool), and have not had the issue since. I think it would be worth a try to get the battery tested. I believe one of these part stores can test your battery at no charge. If it is the battery, it might be a cheaper fix compared to other parts which may need to be replaced that is causing the battery to not properly charge. Good luck!
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03-28-2023, 06:44 AM | #8 |
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Bumping this thread for any other ideas? Battery and alternator were replaced last year. This problem seemed to disappear, then came back with a vengeance this week….it’s resetting every time I start the car.
As soon as it cranks, the MPG shows 99.9, then goes blank and resets. Thanks
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