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Electrical systemPart report

2005 Audi A6 Electrical system Problems

Complaints
16about this part
Share
18%of 91 total for the year
Median mileage
107,500miles
Trend
StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.

NHTSA recorded 16 complaints about the electrical system of the 2005 Audi A6, 18% of the 91 complaints for this model year. Where a mileage was given, the median is 107,500 miles. 1 a fire, according to the filers.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“The left drivers side break light/signal will stop working intermittently. I have noticed that it tends weather dependent. I have read Audi forums whom have said that the electrical wiring when exposed to heat (70 degrees fahrenheit and above) will short causing the LED break/signal light to not work. My mechanic stated that it is also because of a faulty light control module + wiring. Due to the intermittency and high cost of the job it has not been something that I have been able to fix. …”

NHTSA complaint #10913780, filed 2016-10, 120,000 miles

“I purchased a 2005 Audi A6 3.2 quattro in august of 2008 with 37,000 miles. In december 2008 I took the car to the Audi dealer in pasadena because the left rear taillight, left rear reversing light, and left rear fog light were shorting out off and on. Sometimes they would work, sometimes they wouldn't. The dealer said the connectors to that left tail lamp assembly were melted and it was fixed under warranty. …”

NHTSA complaint #10332368, filed 2010-05, 51,000 miles

“My car was running perfectly, next time I went to drive it, it wouldn't start. The wheels and shifter are locked up .the lights and bells work, but it turns out that the module that recognizes the key has failed. I have been on just about every Audi forum to investigate this, and this is an incredibly common complaint. The part that is broke cannot be fixed, rather the entire steering column has to be replaced at a cost of at least $2000, in some cases over $3000. This is an obvious design defect and Audi needs to be held responsible. …”

NHTSA complaint #10777711, filed 2015-09, 135,000 miles

“I was driving my car in my work parking lot when a loud beep occurred and my car issued a warning for parking break malfunction. Two lights, ESC and ABS also lit up when the beep sounded. I immediately stopped driving, engaged the parking brake (which worked) and disengaged it. I am the second owner of the car and after some research found that the brake module and mmi both had been upgraded by the previous owner. I continued to witness these symptoms and am waiting for my dealership to run a diagnostic. …”

NHTSA complaint #10542433, filed 2013-09, 103,542 miles

“During a recent rain storm I went to start the car to discover 6 inches of water in the back seat. Rear airbag and some electrical system had been fried. When I contacted Audi they said that it was not a warranty issue that it was my fault. That a line under the battery compartment had been clogged by pine needles causing the water to flow into the car through the airconditioning system. It seems to me that this is a design flaw and should be covered by Audi.”

NHTSA complaint #10300425, filed 2010-01, 52,000 miles

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2026571%
2025233%
20211161%
20201869%
20198474%
201819%
2017210%
2016816%
2015314%
201425%
2013713%
20121322%
2011314%
2010212%
200915%
2008710%
2007611%
20061319%
20051618%
200439%
20031421%
20021517%
20011412%
20003624%
19993717%
199886%
19971470%
19963875%
19951063%

Other parts of the 2005 Audi A6

Air bags
43 complaints
Brakes
10 complaints
Steering
8 complaints
Exterior lighting
6 complaints
Electronic stability control
5 complaints
Visibility (wipers, defrost, mirrors)
5 complaints
Engine
4 complaints
Vehicle speed control
4 complaints
Engine cooling
3 complaints
Body and structure
3 complaints
Transmission and drivetrain
3 complaints
Other or unknown
2 complaints

← All problems reported for the 2005 Audi A6

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology