hardly worth mentioning
Crashes / Fires:
0 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
92,684 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2005 Audi A6 electrical problems

electrical problem

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2005 Audi A6 Owner Comments

problem #16

May 042015


  • 120,000 miles


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. I am afraid that eventually none of the tail lights will work or even after repairing it, the same issue will arise. I first noticed this in may of 2015, however it was fine through the fall and winter. I again noticed it randomly through the summer months (June-Aug).

- Worcester, MA, USA

problem #15

Jun 012016


  • miles
I reached out to Audi when I received an email stating recalls for my car. I spoke to 2 Audi reps at there call center whom both stated to me that I was wrong about the email I received and to check this site. Once I have it showed and stated the same recall that I received an email about. But once I stated that the dealer may not be aware of the scheduling of this but both reps state that the site backed by auto trader and kbb was incorrect. It bothers me to see that this company is not aware of there own defects which makes me wonder what else is extremely wrong with the car--------- also after seeing the recall my passenger light for the airbags started to flicker when no one was in the car, which lead to some other electrical problem with my car. My whole mmi interface malfunctioned to where its only a black screen

- New Britain, CT, USA

problem #14

Nov 212015


  • 147,000 miles
Start access control unit (J518) malfunction. Car will not start. Audi dealer claims that whole steering column must be replaced. Quote $2,400.

- Madison Heights, MI, USA

problem #13

Oct 152015


  • 192,000 miles


Very common problem - "ignition module defective" code at 190,000 miles. Temporary repair of the issue with dtc reset. Full logging of car data via obd-II port reveals zero faults while car is running, and diagnostic traffic on the can bus at startup show zero faults. Once key is inserted in dash and turned to "accessory", module faults out without any traffic sent/received. Happens intermittently and dealership states this is a known problem. Dealership-only repair, per multiple Audi service technicians, Audi of America refuses to comply with Massachusetts right to repair law by making available to independent repair shops, the necessary tools and equipment to access the immobilizer hardware. Dealer estimates/quotes range from $2100-$3700 to replace entire steering column with the attached and separable ignition module (accessible via 2 screws and 1 rivet). Dealerships refuse to replace/re-code only the ignition module, stating the entire steering column needs replaced. Multiple reports of the same issue with other C6 body Audi A6 owners confirm the same details. Nothing is physically wrong with the ignition switch or module, and clearing diagnostic trouble codes allow the vehicle to start immediately. Suspect planned obsolescence of the part in question.

- Sterling, VA, USA

problem #12

Sep 242015


  • 135,000 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. Paying thousands of dollars for a module that fails to recognize a key is beyond ridiculous. There were no warning lights whatsoever to indicate that this part was failing. Luckily it is currently stuck in my driveway. It could have left me stranded anywhere.

- Paw Paw , MI, USA

problem #11

Apr 092013


  • miles
My sunroof will not retract..

- Grand Prairie, TX, USA

problem #10

Apr 292015

A6 6-cyl

  • 126,948 miles


Having all the same issues with the steering column listed below, why has this issue not been made a recall issue"??? there is an entire page of this problem at the following Audi forums.com link www.audiforums.com/forum/Audi-A6-9/2005-Audi-A6-wont-start-but-mmi-lights-seat-memory-etc-works-finefacebook-twitter-163846/ note: The issues listed in service bulletin no: Tsb-48-14-62 NHTSA id number: 10056441 complaint filed 10/29/2014 NHTSA id number: 10651089 and complaint filed 04/27/2012 NHTSA id number: 10456711. Why hasn't this problem with the steering column become a recall item? when is this problem with the steering column going to become a recall item"

- Dumfries, VA, USA

problem #9

Oct 232014

A6 6-cyl

  • 132,000 miles
We have a 2005 Audi A6 purchased cpo in 06. We recently had issues with brake module issues that are still there but waiting on the recall for this issue. Now we have an issue with our mmi system which is the entertainment part of the car. It controls the music, navigation, and some convenience features. I have seen a lot of Audi owners with this mmi problem as well. There seems to be a trend with Audi vehicles now. I would think when you make a luxury purchase such as this you would not have these kinds of issues. Certainly if you are not abusing the car in any way. This also needs to be a part of a recall. The first indication was I could not reset the battery after the replacement which was not done by Audi. Then I took it to them to reset the battery level and recode the mmi and Audi could not do it? there is an issue here....

- Pfafftown, NC, USA

problem #8

Sep 122011

A6 6-cyl

  • 93,450 miles
On our 2005 Audi A6 we purchased certified pre-owned (cpo) we are the second owners of the vehicle. When we purchased this A6 it had only 30,330 miles. When we got to around 90K+ miles is when we started to have some issues with the cars braking system. We took it to Audi which is the only place we have had it serviced and where we purchased the vehicle. They said there was a problem with the brake module causing the blinking brake light and the ABS light to come on along with a loud beeping from time to time. They thought it could also be low on brake fluid and capped it off. The problem went away for a while but then came back along with the check engine light. This time it was said we have a fault ECU module. We had this service done which costs $2,200.usd but this was just to repair the check engine light but not the brake module. We asked if this repair would resolve both issues and the answer was yes. There are thousands of complaints about the Bosch brake module which seems to be an ongoing problem with Audi. This needs to be recalled and everyone get their money refunded to them for the pain and anguish this has caused. There also needs to be a class action lawsuit against Audi!!

- Pfafftown, NC, USA

problem #7

Jun 032013

A6 6-cyl

  • 55,000 miles
Audi 2005 A6 started to have intermittent warning for ABS, stability, hand brake at ~55K miles. Took car to dealer to diagnose it. Dealer called with an estimate of $2800 to replace ABS module. He also provided an estimate of $1100 for another error code for airbag to replace the center rear seat belt. I'm not understanding why these warning codes come so randomly and clear so randomly. Not sure why an Audi A6 will need such repairs that clearly point to flaws in design and unreliable parts after only 55K miles. There are tons for online complaints from Audi drivers that use the Bosch 8.0 ABS module. Audi should either recall this part or offer to pay for the repairs. When I complained to Audi usa, basically they asked if I was first owner and if I take it to dealer for maintenance. The answers for both is no. I'm the 2nd driver. Bought the car with only 20K miles and since relocating to houston, I take the car to a local garage for oil change. I'm looking for safecar.gov to rectify the issue with Audi. Audi doesn't even sell the ABS module part alone. You will have to buy the brake pump as well.

- Houston, TX, USA

problem #6

Oct 122013

A6 6-cyl

  • 109,000 miles


2005 Audi A6 has water damage. Some how over night heavy rain seepage left an inch of water behind driver seat. Car was parked in driveway. All windows and doors where closed. This has caused $10,000 electrical damage to modules located under front passenger seat. These modules alert me about esp/ABS and park brake as well as a module that powers the vehicles mmi/navigation and stereo system. None of these function any longer. Insurance company wants to totaled the vehicle, I spent $7000 already on repairing the vehicle. Don't know where the water entered my vehicle. Is Audi responsible? this appears to be a design flaw.

- Harrisburg, PA, USA

problem #5

Sep 062013


  • 103,542 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. I have read enough consumer complaints about this specific problem to know that Audi should take a deeper look into it.

- Leicester, MA, USA

problem #4

Jun 012013


  • 60,000 miles
Ignition key cannot be removed from the ignition. Car must be left unlocked with key in ignition, leading to possible theft and/or operation by children or others. Audi service department advises that circuit board is defective and charges more than $2500 but does not carry parts in stock - nalley Audi, roswell, ga.

- Alpharetta, GA, USA

problem #3

May 052012


  • 106,000 miles
My 2005 Audi A6 has water damage. Some how over night heavy rain seepage left an inch of water behind driver seat. Car was parked in driveway at a slight incline. All windows and doors where closed. This has caused $2,700 electrical damage to modules located under front passenger seat. These modules alert me about esp/ABS and park brake as well as a module that powers the vehicles mmi/navigation and stereo system. None of these function anylonger. I don't know where the water entered my vehicle. Is Audi responsible? this appears to be a design flaw.

- Brooklyn Park, MN, USA

problem #2

Apr 082010


  • 51,000 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. The following summer, 2009, I took the car back to the dealer this time in santa monica, ca for the same problem and an oil change where once again they said the connectors to the left rear tail lamp, reversing light, and fog light were melted. I refused to pay and took car to an independent shop for a diagnosis. They said the vehicle has an electrical short and couldn't fix it. A week or two later, the lights were working again. That was summer/fall 2009. By April 2010, the lights stopped working again. I took the car into another Audi dealer this time in downtown, la. They diagnosed the problem saying the electrical system is sending too much electrical current to that side of the car and is causing the wiring to burn at the connection point to the tail lamp assembly. I refuse to pay for service that was already repaired I said just 15 months ago and asked why this is only happening to that side of the vehicle. They told me I would have to pay $385 to fix it. I then took the car to another independent shop this week and they refused to fix the car because there are burn points in the trunk where the wiring is faulty and that Audi should fix the electrical system in the vehicle as it will just keep happening over and over again. I've also had problems with the window switches not working on the left side of the vehicle, and the lights shorting out in the center console. This is not only a big nuisance but I am worried that this could catch fire. Please help in this situation, thank you so much for your time.

- West Hollywood, CA, USA

problem #1

Nov 132009


  • 52,000 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.

- Whittier, CA, USA

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