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2005 A6 4.2 with battery drain - tried everything
04-10-2010, 06:40 PM
#1
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2005 A6 4.2 with battery drain - tried everything
This car which I have owned for 6 months has had this problem for about 4 months, where there is a high current draining the battery when the car is parked.
It has had SIGNIFICANT diagnostic work done, but the source of the problem has not been found. The handy owner, two specialty shops and two audi dealers have not found the source, but have proposed replacing different components.
The current draw, seen on the meter is 1amp then dropping to a low value (30mA), and cycling back to 1 amp again after about 5 mins. There is no blown fuses, no faulty relays, and the effect occurs even with all fuses removed.
Here are the software versions
su c6-hu.33.6.0.0632
hw c6-hu.6303d2.0
fc sw 03501afc6ab-320870
fcps 0870 fchw h07
I Had a pre purchase inspection done at Boseman Audi who found no fault.
After each diagnostic attempt the car adds more faults (possibly due to fuse and relay removal) and now shows ESP fault and parking break malfunction.
The battery and charging circuit has been tested as OK, but one audi dealer insisted on replacing it as the cause. Another said that the cause was the steering column (Fix cost 5k).
Each fuse and relay has been tested. The access/start module under the steering column has been tested and isolated and still the problem.
There is no evidence of any modification to the car. No flood damage. No accident. All functions work as expected. No burning smell. I notice that the MMI does not show a battery level as described in the owners manual.
I have tried everything I know.
It has had SIGNIFICANT diagnostic work done, but the source of the problem has not been found. The handy owner, two specialty shops and two audi dealers have not found the source, but have proposed replacing different components.
The current draw, seen on the meter is 1amp then dropping to a low value (30mA), and cycling back to 1 amp again after about 5 mins. There is no blown fuses, no faulty relays, and the effect occurs even with all fuses removed.
Here are the software versions
su c6-hu.33.6.0.0632
hw c6-hu.6303d2.0
fc sw 03501afc6ab-320870
fcps 0870 fchw h07
I Had a pre purchase inspection done at Boseman Audi who found no fault.
After each diagnostic attempt the car adds more faults (possibly due to fuse and relay removal) and now shows ESP fault and parking break malfunction.
The battery and charging circuit has been tested as OK, but one audi dealer insisted on replacing it as the cause. Another said that the cause was the steering column (Fix cost 5k).
Each fuse and relay has been tested. The access/start module under the steering column has been tested and isolated and still the problem.
There is no evidence of any modification to the car. No flood damage. No accident. All functions work as expected. No burning smell. I notice that the MMI does not show a battery level as described in the owners manual.
I have tried everything I know.
04-10-2010, 09:50 PM
#2
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This car which I have owned for 6 months has had this problem for about 4 months, where there is a high current draining the battery when the car is parked.
It has had SIGNIFICANT diagnostic work done, but the source of the problem has not been found. The handy owner, two specialty shops and two audi dealers have not found the source, but have proposed replacing different components.
The current draw, seen on the meter is 1amp then dropping to a low value (30mA), and cycling back to 1 amp again after about 5 mins. There is no blown fuses, no faulty relays, and the effect occurs even with all fuses removed.
Here are the software versions
su c6-hu.33.6.0.0632
hw c6-hu.6303d2.0
fc sw 03501afc6ab-320870
fcps 0870 fchw h07
I Had a pre purchase inspection done at Boseman Audi who found no fault.
After each diagnostic attempt the car adds more faults (possibly due to fuse and relay removal) and now shows ESP fault and parking break malfunction.
The battery and charging circuit has been tested as OK, but one audi dealer insisted on replacing it as the cause. Another said that the cause was the steering column (Fix cost 5k).
Each fuse and relay has been tested. The access/start module under the steering column has been tested and isolated and still the problem.
There is no evidence of any modification to the car. No flood damage. No accident. All functions work as expected. No burning smell. I notice that the MMI does not show a battery level as described in the owners manual.
I have tried everything I know.
It has had SIGNIFICANT diagnostic work done, but the source of the problem has not been found. The handy owner, two specialty shops and two audi dealers have not found the source, but have proposed replacing different components.
The current draw, seen on the meter is 1amp then dropping to a low value (30mA), and cycling back to 1 amp again after about 5 mins. There is no blown fuses, no faulty relays, and the effect occurs even with all fuses removed.
Here are the software versions
su c6-hu.33.6.0.0632
hw c6-hu.6303d2.0
fc sw 03501afc6ab-320870
fcps 0870 fchw h07
I Had a pre purchase inspection done at Boseman Audi who found no fault.
After each diagnostic attempt the car adds more faults (possibly due to fuse and relay removal) and now shows ESP fault and parking break malfunction.
The battery and charging circuit has been tested as OK, but one audi dealer insisted on replacing it as the cause. Another said that the cause was the steering column (Fix cost 5k).
Each fuse and relay has been tested. The access/start module under the steering column has been tested and isolated and still the problem.
There is no evidence of any modification to the car. No flood damage. No accident. All functions work as expected. No burning smell. I notice that the MMI does not show a battery level as described in the owners manual.
I have tried everything I know.
04-15-2010, 09:00 AM
#4
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Isn't there a known issue where the battery indicator in the MMI causes significant current draw? I thought it was disabled by default in newer MMI versions (you seem to have 3360 - not sure if it was disabled in that version), but I think it can be enabled using a VAG regardless. Check your car MMI menus to see if the battery status is in there.
04-15-2010, 10:33 AM
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I had the same problem with my 05 3.2. I had the MMI updated to the newest version and the problem was solved. I believe there is a a TSB out on the cars for this problem
04-22-2010, 12:36 PM
#6
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Last edited by royclark; 11-05-2013 at 09:43 AM.
04-23-2010, 04:09 AM
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This car which I have owned for 6 months has had this problem for about 4 months, where there is a high current draining the battery when the car is parked.
It has had SIGNIFICANT diagnostic work done, but the source of the problem has not been found. The handy owner, two specialty shops and two audi dealers have not found the source, but have proposed replacing different components.
The current draw, seen on the meter is 1amp then dropping to a low value (30mA), and cycling back to 1 amp again after about 5 mins. There is no blown fuses, no faulty relays, and the effect occurs even with all fuses removed.
Here are the software versions
su c6-hu.33.6.0.0632
hw c6-hu.6303d2.0
fc sw 03501afc6ab-320870
fcps 0870 fchw h07
I Had a pre purchase inspection done at Boseman Audi who found no fault.
After each diagnostic attempt the car adds more faults (possibly due to fuse and relay removal) and now shows ESP fault and parking break malfunction.
The battery and charging circuit has been tested as OK, but one audi dealer insisted on replacing it as the cause. Another said that the cause was the steering column (Fix cost 5k).
Each fuse and relay has been tested. The access/start module under the steering column has been tested and isolated and still the problem.
There is no evidence of any modification to the car. No flood damage. No accident. All functions work as expected. No burning smell. I notice that the MMI does not show a battery level as described in the owners manual.
I have tried everything I know.
It has had SIGNIFICANT diagnostic work done, but the source of the problem has not been found. The handy owner, two specialty shops and two audi dealers have not found the source, but have proposed replacing different components.
The current draw, seen on the meter is 1amp then dropping to a low value (30mA), and cycling back to 1 amp again after about 5 mins. There is no blown fuses, no faulty relays, and the effect occurs even with all fuses removed.
Here are the software versions
su c6-hu.33.6.0.0632
hw c6-hu.6303d2.0
fc sw 03501afc6ab-320870
fcps 0870 fchw h07
I Had a pre purchase inspection done at Boseman Audi who found no fault.
After each diagnostic attempt the car adds more faults (possibly due to fuse and relay removal) and now shows ESP fault and parking break malfunction.
The battery and charging circuit has been tested as OK, but one audi dealer insisted on replacing it as the cause. Another said that the cause was the steering column (Fix cost 5k).
Each fuse and relay has been tested. The access/start module under the steering column has been tested and isolated and still the problem.
There is no evidence of any modification to the car. No flood damage. No accident. All functions work as expected. No burning smell. I notice that the MMI does not show a battery level as described in the owners manual.
I have tried everything I know.
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11-04-2013, 09:47 AM
#9
AudiWorld Senior Member
Did you find out what's happening? I have an 05 that's having this issue. The TSB seems to just say it's for MY 07. Does anyone know if there's a similar TSB for 05? Thanks!
11-04-2013, 10:39 AM
#10
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Location: Stockton,CA
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Sometimes on some models the wires in the seat can trick the system into thinking one of the doors has been left open idk if this helps but it is a known problem...