Battery Light issue.

2693 Views 7 Replies 4 Participants Last post by Ujiro, Nov 20, 2021

ToothlessSt

Discussion Starter · Jan 4, 2021

Hey guys, couple of days ago I was leaving my work and saw that my battery light was on, (Later i figured that it turns off/on occasionally) naturally I went to check my cobb to see the codes, I always a U0284 code, since I do not have AGS whatsoever, I've had this car for year and a half now and been driving with that code no problem, but I saw that there is new codes, U012D, U042E, P065B, and P065C.
My best guess would be an alternator, but I'm just not sure, there was a lot of snow a day or two before I saw the code, I'm not sure if that could affect anything. In other discussions I saw someone saying that battery might cause the issue. I have checked voltage on my car, when off it does 12.5V, and when the vehicle is on and the light is off it does 14.7V, but when the light goes on it does 13.7V. No driving issues at all, and I haven't seen any electric issues too.
Hopefully you guys could help me!
I call on you FoST gurus: @SSgtjrobertson and @Duece McCracken

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SSgtjrobertson

· #2 · Jan 4, 2021

Key not recognized, vehicle won't start...

*Updated to add mention of the AGS causing a communications problem with the alternator and battery light. 11/28/2020 05/27/2021 - BMS manual reset procedure added courtesy of @ddfred 07/12/2021 Ford part number for fuse added 07/18/2021 Added full location, description, and Ford part...

www.focusst.org

I updated this thread to include some of these issues. Read over this post and we can discuss it further.

J

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ToothlessSt

Discussion Starter · #3 · Jan 4, 2021

SSgtjrobertson said:
Key not recognized, vehicle won't start...

*Updated to add mention of the AGS causing a communications problem with the alternator and battery light. 11/28/2020 05/27/2021 - BMS manual reset procedure added courtesy of @ddfred 07/12/2021 Ford part number for fuse added 07/18/2021 Added full location, description, and Ford part...

www.focusst.org

I updated this thread to include some of these issues. Read over this post and we can discuss it further.

J

Yes, I've went through that thread, it seems very helpful, but I couldn't really find anything. Most common idea is AGS, but once again, I don't have them, and my the port for it have been dangling around ever since I've had it.

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SSgtjrobertson

· #4 · Jan 5, 2021

ToothlessSt said:
Yes, I've went through that thread, it seems very helpful, but I couldn't really find anything. Most common idea is AGS, but once again, I don't have them, and my the port for it have been dangling around ever since I've had it.

Do you have a DMM (digital multimeter)?

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ToothlessSt

Discussion Starter · #5 · Jan 5, 2021

SSgtjrobertson said:
Do you have a DMM (digital multimeter)?

Yes, I do have one.

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Ujiro

· #6 · Nov 15, 2021

ToothlessSt said:
Yes, I do have one.

Did you end up figuring out what was the cause of your codes? I am having a similar issue, battery light came on and I have P065B and P065C. Going to check things out tonight or tomorrow morning and keep jumper cables/my booster pack handy in case I run into issues. P065C states "Generator Mechanical Performance" and P065B "Generator Control Circuit Range/Performance ". Alternator seems like my best guess but I am first going to check voltages and for any loose/corroded connections. Quick peek when I had time showed that the battery connections look fine with no sign of corrosion, same with the chassis grounding.

If anyone else out there has input, would be greatly appreciated.

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beretta96

· #7 · Nov 19, 2021

@Ujiro Did this end up being a bad alternator?

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Ujiro

· #8 · Nov 20, 2021

beretta96 said:
@Ujiro Did this end up being a bad alternator?

Yes it did indeed. Bad alternator. My battery was on its last leg so I killed it by over discharge also. Should’ve parked it and had it towed to get looked at rather than trying to drive it to the shop!

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