am_ver

Symptoms:
- Battery meter in MMI always on lowest level
- Errors in VAG logs (below)
- Sometimes at start-up the low battery yellow light comes up
- Sometimes the car doesn't start at first go (very intermittent). Not sure if that is related.

Diagnosis:
- When idle, the battery reads 14.2V (in engine as well as in the trunk)
- When car off, the battery reads 12.1 (in engine as well as in the trunk)
- Took battery to O Reilly, and they confirmed battery is fine. Cleaned the terminals too
- Took the battery out, checked the door behind the battery. The red thin wire is intact and is connected to the screw on the chassis.


_____________



Friday,21,October,2016,12:41:59:26365
VCDS Version: Release 805.1

Address 61: Battery Regul.
Control Module Part Number: 4F0 910 181 E
Component and/or Version: J0644 BEM H12 0590
Software Coding:
Work Shop Code: WSC 26147
Additional Info: 4F0915105C von VA0 0510080568
Additional Info: Geraet 58994
1 Fault Found

02255 - Voltage Measuring Lead from Vbat
009 - Open or Short to Ground
Freeze Frame
Fault Status: 01101001
Fault Priority: 4
Fault Frequency: 1
Reset counter: 94
Mileage: 251248 km
Time Indication: 0
Date: 2016.10.21
Time: 11:51:42


The above scan is after clearing the code.
_____________________________

Friday,21,October,2016,12:41:24:26365
VCDS Version: Release 805.1

Address 61: Battery Regul.
Control Module Part Number: 4F0 910 181 E
Component and/or Version: J0644 BEM H12 0590
Software Coding:
Work Shop Code: WSC 26147
Additional Info: 4F0915105C von VA0 0510080568
Additional Info: Geraet 58994
5 Faults Found

02274 - Quiescent Current Stage 3
000 - - - Intermittent
Freeze Frame
Fault Status: 00100000
Fault Priority: 7
Fault Frequency: 85
Mileage: 249809 km
Time Indication: 0
Date: 2016.09.16
Time: 10:09:41

02277 - Quiescent Current Stage 6
000 - - - Intermittent
Freeze Frame
Fault Status: 00100000
Fault Priority: 7
Fault Frequency: 71
Mileage: 249951 km
Time Indication: 0
Date: 2016.09.18
Time: 14:07:03

00532 - Supply Voltage B+
002 - Lower Limit Exceeded - Intermittent
Freeze Frame
Fault Status: 00110010
Fault Priority: 1
Fault Frequency: 2
Reset counter: 130
Mileage: 249951 km
Time Indication: 0
Date: 2016.09.17
Time: 14:15:38

02272 - Quiescent Current Stage 1
000 - - - Intermittent
Freeze Frame
Fault Status: 00100000
Fault Priority: 7
Fault Frequency: 1
Mileage: 251150 km
Time Indication: 0
Date: 2005.09.20
Time: 12:20:51

02255 - Voltage Measuring Lead from Vbat
009 - Open or Short to Ground
Freeze Frame
Fault Status: ca01101001
Fault Priority: 4
Fault Frequency: 19
Reset counter: 94
Mileage: 249809 km
Time Indication: 0
Date: 2016.09.16
Time: 09:10:34

A6Gary

How old is your battery? I just replaced the original OEM battery (late-2005 build date) in my 2006 A6 Avant, even though the MMI showed it 100% charged. However, the battery level should read 12.7 volts with the engine off; my old battery measured 12.2 volts, and I starting getting a DTC. At 12.1 volts, your voltage is too low to support the battery energy management (BEM) system, and could lead to illuminating the CEL. If your battery is 5-6 years old, I suggest replacing it, with an OEM AGM battery. Don't forget to code the new battery.

am_ver

Appreciate your help A6Gary.

Battery is fairly new and was replaced about 12 months ago. I even got it tested at O Reilly and they gave their thumbs up.

The battery was never coded after it was replaced. I got the BEM code, but it appears the lower letters (second set) are not fully readable. I did my best to guess the numbers (it said no letters), and got a coding accepted.

Immediately, the low battery warning went away and the battery meter read at 95% - Yaaaay.... but not really.

Went back to the car later in the evening, and the battery still reads 5%. Did I just get the numbers wrong?? I even checked the receipt from the Audi dealer for the BEM numbers, but there is nothing on the receipt. It only has the 915105DK number on it.

the_duke

I had similar issues with my D3 A8. Replaced the battery and same issues remained. I unhooked the battery, put a charger on it, and left it that way overnight. Hooked it up the next day and everything was fine.