2012 Audi A6 Problems

What owners report

Owners of the 2012 Audi A6 most often describe two kinds of trouble: the passenger airbag status indicator behaving erratically because the seat occupant detection system stops recognising a passenger, and a coolant valve that lets coolant reach the transmission or engine wiring, triggering multiple warning lights and loss of power. Engine and fuel-system reports are also frequent; fuel odours and leaks around the injection area come up repeatedly in the sampled complaints, often at higher mileage.

1. 1
   Air bags

   Passenger airbag light on / seat weight sensor fault

   • 12 complaints (20%)
   • median 68,500 mi at 5.2 yrs old (8 state mileage, few)
   • filed 2016–2026

   Owners describe the passenger airbag indicator lighting or flashing whenever someone sits in the front passenger seat, and in some cases with the seat empty. Several say the dealer diagnosed the PODS (seat weight/occupant detection) sensor as having an internal fault and quoted a replacement, while others were told the recall remedy was not available for their vehicle or that their VIN was not covered even though the symptom matched the campaign description. A few report the same problem appearing after the recall repair had already been performed. Reported from roughly 22,000 to 154,000 miles, with many cases in the 50,000-80,000 range.

   Recall 18V370000Recall 15V823000

   What to check: With a passenger seated in each front seat, confirm the passenger airbag status reads correctly and no airbag warning light stays on. Ask whether recall 18V370000 or 15V823000 has been completed, and get the sensor diagnosed if the light misbehaves.

   2 excerpts from owner complaints in NHTSA records

   “Reference NHTSA campaign number 15v823000, my Audi A6 falls within the model year as well as the as built time line. I've just been diagnosed by my local Audi dealer that my pods unit is bad. My Audi does have heated seats so it fits the problem description as released by Audi as well as NHTSA but due to the fact my VIN doesn't pull up this campaign. I believe that there are more Audi's affected within that model year as well as build time frame that could be affected by this. …”

   NHTSA complaint #10863026, filed 2016-05, 75,000 miles

   “Reference NHTSA campaign number 15v823000, my 2012 Audi A6 falls within the model year as well as the as build date. I've been told by my local dealer I need the new pods (passenger occupancy detection system) installed since mine is bad. My Audi has the heated seats, but not air conditioned seats as identified in the campaign, but I have the same issue as described in the recall campaign. …”

   NHTSA complaint #11063220, filed 2018-01
2. 2
   Engine

   Coolant valve leak into wiring harness

   • 8 complaints (13%)
   • median 80,000 mi at 7.5 yrs old (7 state mileage, few)
   • filed 2016–2022

   Complaints describe coolant escaping at a valve and travelling through a connector into the wiring harness, at times reaching the transmission control module or engine control module. Owners report a cluster of warning messages appearing (transmission, stability control, electric parking brake), reduced power, rough or delayed shifting, and in several cases the vehicle shutting down on the road. Dealers diagnosed a leaking coolant valve with contaminated connectors and replaced the valve and affected wiring or control units. Reported between roughly 52,000 and 122,000 miles, often after several years of use.

   Recall 18V229000Recall 17V002000

   What to check: Check for dried coolant residue or staining around the coolant valve and its electrical connector, and ask whether the valve, connector or wiring has been replaced. A pre-purchase scan for stored transmission and engine codes is worth the cost.

   2 excerpts from owner complaints in NHTSA records

   “My mil ( malfunction indicator lamp ) came on, in my Audi A6 2012 on 1/21/18. I made an appointment with my Audi dealership on 1/31/18. I was informed that my trans coolant valve was leaking into a wiring harness. They replaced my n509 valve and wiring connector. I found a technical service bulletin regarding this problem in my car as well as other Audi models. There was a recall for this in Audi a8 2010-2013. …”

   NHTSA complaint #11066897, filed 2018-02, 75,410 miles

   “This needs to be heavily looked into. I see countless reports online and on NHTSA about coolant leaking onto components/wiring. Whatever it is, is definitely frying the electrical system. My info screen will state: Transmission Malfunction: You can continue driving and it'll go away a minute later, them beep again with the same message- then beep again- then go away- then come back again. etc etc etc. I recently a year or so ago got some coolant leak that was dripping on transmission wires below. I've seen this complaint too many times. …”

   NHTSA complaint #11466406, filed 2022-05
3. 3
   Fuel system

   Fuel odour and fuel leaks near the injection system

   • 8 complaints (13%)
   • median 100,000 mi at 7.1 yrs old (7 state mileage, few)
   • filed 2014–2023

   Owners describe noticing a fuel smell under the hood or through the vents while driving, sometimes with extended cranking at start-up, and on inspection finding fuel escaping around the injector area or a fuel line connector. Several say the dealer found the leak but did not always cover it under recall because the VIN was excluded or the campaign had already been performed; a couple of owners were told a rodent had damaged the hose. Reported from about 30,000 to 120,000 miles, several at or near 100,000 miles.

   Recall 17V781000Recall 16V646000Recall 15V019000

   What to check: Open the hood after a drive and check for a fuel smell or visible seepage around the injectors and fuel lines, and confirm whether recalls 17V781000, 16V646000 or 15V019000 were completed for this VIN.

   2 excerpts from owner complaints in NHTSA records

   “Upon starting my vehicle I noticed extended cranking. Upon driving the vehicle I noticed a fuel odor, initially I thought it was the older vehicle driving in front of me. After driving approximately 4 miles I realized it was my vehicle. I then drove my vehicle back to my house, and had it towed to Audi of albany due to recalls that were open. Upon inspection they performed recalls, but informed me the recall for the engine fuel rails was performed june 2015. …”

   NHTSA complaint #11193012, filed 2019-04, 100,000 miles

   “I was driving my vehicle & noticed a fuel smell. When I got to my destination shortly down the road (~1 mile) I inspected my engine for the source of the smell & found fuel leaking down the front of my engine from under the supercharger. After disassembling the top of the engine I found the injector supports to be the old recalled parts (verified with engraved part numbers). I then called the Audi dealer that supposedly performed the recall and explained the situation. They were very dismissive & advised me to bring the vehicle in. …”

   NHTSA complaint #11348634, filed 2020-08, 100,000 miles
4. 4
   Steering

   Loss of steering assist / steering fault message

   • 6 complaints (10%)
   • median 124,000 mi at 7.9 yrs old (3 state mileage, few)
   • filed 2013–2024

   Complaints describe a steering malfunction message appearing, sometimes after the car has been parked and then fails to start the next day, with the wheel becoming very heavy or effectively locked and the vehicle needing to be towed. Some owners report the steering rack or steering control module being replaced, and a few describe notchiness or wandering on-centre that persisted after a rack replacement. Reported from a few thousand miles up to about 164,000 miles, spread across the model year's life.

   1 related service bulletin

   What to check: Start the car and confirm no steering malfunction warning appears, and drive at low speed to feel for heavy or notchy steering. Ask whether the steering control module or rack has ever been replaced.

   2 excerpts from owner complaints in NHTSA records

   “Steering is notchy and unstable on-center and slightly off-center. It is impossible to keep the car straight while accelerating, braking or at constant speed. Must constantly correct left and right making the car swerve uncontrollably left and right. Impossible to keep straight. It is hazardous to drive. Took care to dealership. They replaced the steering rack but the problem persists. I believe Audi is aware of the problem but hasn't provided a solution.”

   NHTSA complaint #10504796, filed 2013-03, 7,000 miles

   “While driving on highway steering system faulted, causing loss of power steering. Rack completely failed. Very very difficult to turn steering wheel. Car only has 124k miles.”

   NHTSA complaint #11320629, filed 2020-04, 124,000 miles
5. 5
   Transmission and drivetrain

   Transmission warning and harsh shifting (mechatronic and

   • 11 complaints (18%)
   • median 62,000 mi at 4.4 yrs old (9 state mileage, few)
   • filed 2012–2022

   Owners report rough or hunting shifts at low speed from a standstill, and instrument-cluster warnings that the transmission can continue to be driven, sometimes recurring intermittently. Others were told the mechatronic unit or transmission control module needed replacement, with some repairs linked to coolant contamination of the transmission wiring. Several say the dealer acknowledged the symptom but did not cover the repair. Reported from around 20,000 to 63,000 miles; some cases appeared at very low mileage under normal driving.

   3 related service bulletins

   What to check: Test drive from a stop and feel for harsh 1-2 and 2-3 shifts, and scan the transmission control module for stored codes. Ask whether the mechatronic unit or its wiring has been serviced.

   2 excerpts from owner complaints in NHTSA records

   “I just had check engine light which aperantly is a bad mechatronic device. Thank god nothing bad happened during driving, however when I talked to Audi corporate and was told it was not acommon problem and they dont want to fix it. The car is 60k and always was taken care in dealership shops, on time. Used only 30 miles a day and always kept indorr both at my work and at home. When reading online about this problem I learnt that this is a common problem, and Audi apparently not trying to cover or solve it. …”

   NHTSA complaint #11244691, filed 2019-08, 63,000 miles

   “Shifts rough from start through first set of gears. From a standstill, under normal traffic conditions, no matter what setting the car is in, the transmission hunts for the correct gear and roughly shifts from 1-2 or 2-3. This issue was supposed to be settled by the CVT class action but Audi is refusing to repair/replace. …”

   NHTSA complaint #11319084, filed 2020-03, 20,031 miles

Buying note. Check that the airbag, fuel-line and coolant-pump recalls were actually completed for the specific VIN, and have any car scanned for transmission and airbag codes before purchase, since several of the recurring complaints here show up as stored faults before they become obvious on a test drive.

Summary written with AI from a sample of 58 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.