53 of the
3,677 complaints filed about the Audi A4
are about the body and structure —
1% of everything owners reported.
The worst model year for it is 2003.
A vehicle diagnostic scan dated 04/15/2026 showed electrical communication faults involving vehicle control modules. The scan showed U014100, described as “Lost Communication With Body Control Module ‘A’,” with status listed as passive/sporadic. The scan also showed U112100, described as “Data bus message missing,” with status listed as active/static. This is being reported as a safety concern because body-control module, gateway, and data-bus communication faults can affect vehicle electrical functions, warning systems, access/locking systems, lighting or body-control functions, driver information, and other vehicle systems that rely on module communication. The concern is especially important because the vehicle has had multiple intermittent electrical/body-control symptoms, including fuel-door/tank-flap electrical faults and other reported intermittent vehicle electrical concerns. No crash, fire, injury, or fatality occurred. The vehicle/component is available for inspection, and the diagnostic scan report, electrical-system records, service communications, and related repair records are available if requested.
NHTSA complaint #11747863 — an unverified report by a vehicle owner.
Visible wiring has become exposed in the windshield/A-pillar area. There is no airbag/SRS warning light at this time, and I am not able to determine from visual inspection whether the exposed wiring is related to the restraint system. However, this is a safety-sensitive area because it can contain or route electrical wiring near trim, sensors, and safety-system areas. Exposed or unsecured wiring in this area may create a risk of electrical short, damaged wiring, impaired signal integrity, loose trim, moisture intrusion, or safety-system malfunction. The concern was reported as part of broader electrical and safety-related issues. No crash, fire, injury, or fatality occurred. This complaint is being submitted because exposed wiring in the A-pillar/windshield-pillar area is not normal and should be inspected to determine whether the wiring, trim, connector routing, or related electrical/safety components are compromised. The vehicle/component is available for inspection, and photo evidence and service communications are available.
NHTSA complaint #11747810 — an unverified report by a vehicle owner.
The sunroof has a recurring mechanical/electrical malfunction. During operation, the sunroof binds and makes a loud popping or cracking noise, and the rubber seal became torn or damaged. This suggests a possible track, guide, cable, motor, regulator, frame, seal, or alignment failure. This is being reported as a safety concern because a binding or popping sunroof can distract the driver, allow water intrusion into electrical areas, worsen into glass/track/frame failure, or create a risk of loose roof components while the vehicle is in use. The issue was reported to Audi service and was not fully resolved or documented to my satisfaction. No crash, fire, injury, or fatality occurred. The vehicle/component is available for inspection, and photos, video stills, service communications, and repair records are available.
NHTSA complaint #11747811 — an unverified report by a vehicle owner.
The fuel filler door/gas door intermittently fails to open, preventing normal access to the fuel filler area. This appears to involve the fuel door latch, release mechanism, lock actuator, body component, electrical control, or related wiring/module issue. This is being reported as a safety concern because inability to open the fuel door can prevent refueling when fuel is low. If the vehicle cannot be refueled, it can create a stranding risk or loss-of-propulsion risk, including in traffic, at night, on a highway, or in an unsafe location. The issue also creates driver distraction and uncertainty because refueling access is not reliable. No crash, fire, injury, or fatality occurred. The vehicle/component is available for inspection, and photos/video, service communications, and repair records are available if requested.
NHTSA complaint #11747847 — an unverified report by a vehicle owner.
The vehicle has a recurring interior rattle / loose-trim concern involving interior panels, trim, speaker/subwoofer area, rear shelf, dashboard area, or related mounting components. The noise is not merely a comfort concern if it is caused by a loose component, fastener, grille, panel, or speaker housing that may move, worsen, detach, or distract the driver. This is being reported as a safety concern because loose interior trim or components can distract the driver, interfere with normal vehicle use, create uncertainty about whether a component is secured, and may indicate improper fastening, panel fitment, speaker/subwoofer mounting, or body/electrical component installation issues. If the affected trim is near safety-system areas, it should be inspected to confirm it does not affect wiring, restraint-system areas, visibility, or safe vehicle operation. No crash, fire, injury, or fatality occurred. The vehicle/component is available for inspection, and service records, TSB-related records, photos/video/audio, issue lists, and repair communications are available if requested.
NHTSA complaint #11747854 — an unverified report by a vehicle owner.
The contact owns a 2014 Audi A4 Allroad. The contact stated that water had leaked into several electrical components including the back-up camera and the sound system. The contact stated that the radio could not be turned off and remained on with the volume on high. The contact took the vehicle to a certified mechanic who stated that water had leaked through sunroof rails that opened and closed the sunroof. The certified mechanic replaced the radio receiver. The contact took the vehicle to the dealer who diagnosed the vehicle and replaced the back-up camera system. The manufacturer was not made aware of the issue. The approximate failure mileage was 85,000.
NHTSA complaint #11432744 — an unverified report by a vehicle owner.
TL* THE CONTACT OWNS A 2015 AUDI A4. THE CONTACT STATED WHILE DRIVING 35 MPH, THE FRONT GRILL OF THE VEHICLE DETACHED AND SEPARATED FROM THE VEHICLE. THE CONTACT ALSO STATED THAT THE HEADLIGHTS WERE INOPERABLE, AND THERE WAS NO OIL IN THE ENGINE. THE CONTACT STATED THAT SEVERAL UNKNOWN WARNING LIGHTS WERE ILLUMINATED. THE CONTACT WAS RELATING THE ISSUE TO A WIRING ISSUE. THE VEHICLE WAS TAKEN TO KEY FORD OF YORK (422 US-1, YORK, ME 03909) TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE HEADLIGHTS NEEDED TO BE REPLACED. ADDITIONALLY, THE ENGINE OIL NEEDED TO BE TOPPED OFF. THE VEHICLE WAS REPAIRED HOWEVER, THE FAILURE WITH THE HEADLIGHTS RECURRED. THE MANUFACTURER HAD NOT BEEN INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 42,000.
NHTSA complaint #11405766 — an unverified report by a vehicle owner.
FRONT OF BODY RIDES TOO LOW TO GROUND. BODY DAMAGE OCCURRED ON LEFT FRONT FENDER FROM DRIVING UP A STEEP HILL AFTER MAKING LEFT TURN ONTO ROAD WITH THE STEEP HILL.
NHTSA complaint #11327100 — an unverified report by a vehicle owner.
I PURCHASED FROM A DEALERSHIP WITH WARRANTY AND WITH IN THE WEEK THE CAR NEEDED A QUART OF OIL, I COME TO FIND OUT THE CAR HAS BEEN TO AUDI DEALERSHIP AND IT WAS ADVISED THE VACUUM PUMP NEEDS TO BE REPLACED AND THAT THE ENGINE IS CONSUMING OIL, THE DEALERSHIP THAT SOLD THIS CAR IN AUCTION TO THE DEALERSHIP I BOUGHT THE CAR FROM WAS FULLY AWARE OF THIS ISSUE SINCE AUDI DIAGNOSED IT FOR THEM AND NO WORK HAD BEEN DONE. AUDI HAD A CALL BACK FOR THIS ISSUE AND HAD REFUSED TO ADDRESS THE ISSUE WHEN THE DEALERSHIP BROUGHT IT TO THEIR ATTENTION AND NOW I AM STUCK WITH A CAR LOAN ON A CAR THAT NEED OVER $6K IN REPAIRS TO THE ENGINE IT SELF.
NHTSA complaint #11183701 — an unverified report by a vehicle owner.
SO I OPENED UP THE SUNROOF, TOOK A LONG WIRE AND STARTED POKING. I ALSO REMOVED THE WHEEL ARCH AND CLEANED OUT THE OUTLET. I POURED A BUCKET OF WATER THRU AND IT CAME OUT OF THE BOTTOM NICELY. ALL WELL I THOUGHT. TODAY IT RAINED FOR THE FIRST TIME SINCE THEN, AND I WAS VERY UNPLEASANTLY SURPRISED TO FEEL WATERDROPS DRIPPING FROM THE HOOD OPENING GRIP NEXT TO MY FEET. SINCE MY CAR IS ALWAYS OUTSIDE AND NOT COVERED AGAINST THE RAIN, I HAD TO DEAL WITH IT RIGHT AWAY. I STRIPPED THE A PILLAR COVER AND SAW IT HAD SERIOUS WATER MARKS. OBVIOUSLY THE WATER HAD BEEN DRIPPING SLOWLY FOR MANY MONTHS ALREADY. IT JUST NEVER GOT WORSE ENOUGH AS YOU CAN SEE IN THE PICTURE THE GREEN HOSE IS THE DRAIN, AND IT HAS A BROWN STRIPE DOWN THE BOTTOM FROM LONG TIME DRIPPING. THE LEAK SEEMED TO COME FROM ALL THE WAY UP TO WHERE IT IS CONNECTED TO THE SUNROOF DRAIN PIPE. I PULLED IT LOOSE AND THE HOSE IS FITTED TO THE PIPE WITH SOFT PLASTIC CONNECTOR. THE CONNECTOR SLIDES OVER THE PIPE, BUT THE HOSE IS GLUED TO IT. NOW THE GLUE IS EXACTLY WHAT CAUSED THE PROBLEM! THE GLUE HAD GOTTEN BRITTLE AND HAD CRACKED, IT SEEMS LIKE AUDI USED THE WRONG GLUE FOR THIS HOSE. I CLEANED IT , GLUED IT BACK TOGETHER AND POURED ANOTHER BUCKET OF WATER THRU, BUT NOW WHILE THE LINING WAS STILL OPEN AND THE HOSE FULLY EXPOSED. NO DRIP AT ALL! I MUST SAY, THIS PROBLEM WAS A VERY NASTY ONE, IT REALLY BUGGED ME VERY MUCH TO GET WATER IN THE CAR, ESPECIALLY BECAUSE IT CAN DO SO MUCH DAMAGE. ATTACHED IS A PICTURE WHERE YOU SEE THE ROOF AIRBAG WHICH WAS TOTALLY WET ALSO. A PICTURE WHERE YOU SEE THE GREEN HOSE WITH THE DRIP MARKS, AND A PICTURE WHICH SHOWS THE LEFT SIDE OF THE DASHBOARD WITH THE FUSE BOX EXPOSED, IF YOU LOOK CLOSELY, YOU SEE THE STEEL IS RUSTED, SINCE THE SUNROOF WATER DRAINING IS A VERY WIDE SPREAD Q7 PROBLEM I WOULD ADVISE ALL OWNERS TO CHECK THE FUSE BOX.
NHTSA complaint #10917158 — an unverified report by a vehicle owner.
REAR WINDOW OF CONVERTIBLE SOFT TOP FOR 2004 AUDI A4 CABRIOLET. AN OLD ISSUE OFTEN SUFFERED BY AUDI CABRIOLETS FROM 2003-2009. CLAIMED TO BE CAUSED BY THE ADHESIVE THAT AUDI USES. THIS CAN BE CAUSED BY KEEPING THE CAR OUTSIDE INSTEAD OF IN A GARAGE AS PROLONGED EXPOSURE TO SUNLIGHT CAUSES THE ADHESIVE TO GIVE AWAY AND FAIL, CAUSING THE REAR WINDOW TO SEPARATE FROM THE OUTER LAYER OF THE TOP AND DROP. WHILE THE WINDOW IS STILL TECHNICALLY ATTACHED TO THE INNER LAYER OF THE TOP, THE WINDOW NO LONGER PROTECTS AGAINST WATER. AS A RESULT RAIN CAN SEEP INTO THE NON WATER RESISTANT INNER LAYER OF THE TOP AND THEN CAUSE WATER DAMAGE TO THE REAR SEATS. THIS IS THE CASE WITH MY OWN CAR AND WITH A LARGE ENOUGH NUMBER OF CABRIOLETS THAT THIS SHOULD HAVE BEEN SETTLED FRANKLY, A GOOD 10 YEARS AGO WHEN THE FIRST CASES WERE BEING NOTICED. I HAVE AS MANY OTHERS HAVE, ATTEMPTED TO USE A TEMPORARY FIX AND AS A RESULT, THERE IS A CLEAR INDUSTRIAL ADHESIVE AROUND THE TOP AND REAR WINDOW TO ATTEMPT TO FIX THIS, IT FAILS WITH CONTINUED USE.
NHTSA complaint #10902055 — an unverified report by a vehicle owner.
SUN ROOF DRAINS ON RIGHT HAND SIDE OF VEHICLE HAVE FAILED (FAIL TO SEAL OUT EXTERNAL WATER LIKE RAIN) LEADING TO SIGNIFICANT QUANTITIES OF WATER ENTERING THE PASSENGER COMPARTMENT AND DRAINING INTO VARIOUS AREAS OF THE CAR DURING ANY MEASURABLE RAIN FALL. THE LAST RAIN STORM OF ABOUT 1/3" WAS ENOUGH TO CAUSE THE FOLLOWING DAMAGE. WHILE PARKED OVERNIGHT, SOME OF THE WATER POOLED IN THE RIGHT REAR BODY COLUMN SPACE WHERE THE MASTER COMPUTER FOR MUCH OF THE CAR IS LOCATED. THE WATER SHORTED OUT THE COMPUTER AND LEFT CAR INOPERABLE, UNMOVEABLE, UNUSABLE UNTIL IT WAS TOWED AND REPLACED, THIS INCLUDED THE PURCHASE OF A NEW COMPUTER AND ITS PROGRAMMING AND THE REPROGRAMMING OF THE CAR'S KEYS. ADDITIONALLY THE WATER SATURATED THE CARPET THROUGHOUT THE CAR AND THE SEATS. THE SUNROOF DRAIN REPAIR WAS EXPENSIVE AS WERE THE COMPUTER REPLACEMENT AND REPROGRAMMING. AUDI HAS SETTLED A CLASS ACTION LAWSUIT FOR LEAKY SUNROOF DRAINS FOR MODEL YEARS 2005-2008, MINE IS A 2009 SO NO LUCK FROM AUDI ON PAYING FOR ANY OF IT, AND WHEN I CALLED TO COMPLAIN THEY DENIED ANY FAULT IN THE MATTER.
NHTSA complaint #10863146 — an unverified report by a vehicle owner.
I ACCIDENTALLY DROVE OVER THE RUMBLE STRIP ON THE SIDE OF THE HIGHWAY. THE RIGHT REAR TIRE BLEW AND THE CAR FLIPPED OVER SIX TIMES AND CHANGED DIRECTION. EVERY SIDE AIR BAG INFLATED EXCEPTED FOR MY SIDE, THE DRIVER'S SIDE AIR BAG. THE FRONT AIR BAG DID NOT DEPLOY EITHER. MY A4 WAS COMPLETELY DESTROYED EXCEPT FOR WHERE I WAS SITTING. WHEN THE FIRST RESPONDERS CAME THEY DID NOT EXPECT FOR ME TO BE ALIVE AND THE ACCIDENT WAS CLASSIFIED AS A LEVEL 2 TRAUMA. I HIT MY HEAD ON THE DRIVER'S SIDE WINDOW AND SUFFERED A MAJOR CONCUSSION WITH A HEMATOMA. I ALSO HAD MAJOR FACIAL LACERATIONS, A BROKEN NOSE, BROKEN RIBS, AND A SEVERE BONE BRUISE ON MY KNEE. AUDI SENT AN INSPECTOR TO THE CAR AFTER THE ACCIDENT AND HIS CONCLUSION WAS THERE WAS NOT ENOUGH IMPACT ON THE SIDE OF THE CAR EVEN THOUGH THE CAR FLIPPED SIX TIMES AT HIGHWAY SPEEDS TO DEPLOY MY SIDE AIR BAG. EVERY OTHER SIDE CURTAIN AIRBAG DEPLOYED. THE ONLY OTHER PASSENGERS IN THE CAR WERE MY TWO LABRADORS. NO OTHER ADULTS WERE IN THE CAR. THE TWO LABRADORS EACH WEIGHED LESS THAN 65 POUNDS AND I WEIGH 135 POUNDS. AUDI HAS GIVEN ME A FREE MAINTENANCE PACKAGE FOR MY NEXT AUDI. THANK YOU FOR LOOKING INTO THIS MATTER. A DVD OF PICTURES WAS MADE OF THE CAR ALONG WITH A REPORT OF THE CONDITION OF THE CAR AFTER THE ACCIDENT.
NHTSA complaint #10662094 — an unverified report by a vehicle owner.
THE 2009 AUDI A4 CONVERTIBLE REAR WINDOW'S ADHESIVE ON MY CAR (AND OTHERS, ACCORDING TO INTERNET/YOUTUBE POSTINGS) IS BECOMING DETACHED FROM THE TOP. THE ONLY CHOICE OWNERS HAVE IS TO PURCHASE A NEW CONVERTIBLE TOP. DEALERS CHARGE BETWEEN $4500-$6000. PRIVATE BODY SHOPS CHARGE APPROX. $1600+. WHILE RESEARCHING THE ISSUE, I DISCOVERED THAT IT IS A RELATIVELY COMMON PROBLEM WITH AUDI CONVERTIBLES, AS CONFIRMED BY THE AUDI SERVICE REP WHO INFORMED ME OF THE ISSUE DURING A SERVICE VISIT. IF THAT IS THE CASE, AUDI SHOULD HOLD THE ADHESIVE COMPANY RESPONSIBLE FOR REPAIR, NOT THE AUDI CUSTOMER. PURCHASING AN ENTIRELY NEW TOP IS UNREASONABLE AND UNFAIR. MY REQUEST: AUDI USA SHOULD ISSUE A RECALL, WHETHER THE CAR IS STILL UNDER WARRANTY OR NOT, AT NO CHARGE TO ITS CUSTOMERS. SHOULD RECOUP COSTS FROM THE ADHESIVE MANUFACTURER. AT THE VERY LEAST, CUSTOMERS, AT THE POINT OF SALE, SHOULD BE WARNED OF THE POSSIBILITY OF THE DEFECT THAT HAPPENS SOON AFTER PURCHASE.
NHTSA complaint #10545563 — an unverified report by a vehicle owner.
I WAS JUST PARKING THE CAR AND WAS ABOUT 5 MPH AND SUDDENLY CAR GOT ACCELERATED UNINTENTIONALLY TO HIGHER RPM AND HIT THE CURB AND ABOVE CEMENT WALL . EVEN APPLYING BRAKES HADN'T SLOWED DOWN THE VEHICLE BECAUSE IT WAS JUST FEW FEET AWAY.
NHTSA complaint #10499431 — an unverified report by a vehicle owner.
AS I WAS OPENING THE HOOD OF THE CAR TO FILL UP THE WINDOW WASHER, THE HOOD DID NOT STAY UP AS USUAL. IT STARTED TO CLOSE AND IT HIT MY HEAD ON THE WAY DOWN. I AM WONDERING IF THERE HAVE BEEN OTHER REPORTS OF THE SAME INCIDENT. LUCKILY, I SUFFERED ONLY MINOR DAMAGE TO MY HEAD, HOWEVER I HAVE ON GOING HEADACHES AS A RESULT.
NHTSA complaint #10487641 — an unverified report by a vehicle owner.
AFTER HAVING MY CAR FOR A YEAR, IT STARTED TO BURN THROUGH OIL AT AN INCREASING RATE. CURRENTLY IT IS GOING THROUGH ABOUT 1 QUART OF OIL EVERY 1000 MILES. I HAVE TAKEN THE CAR IN A FEW TIMES TO CHECK FOR LEAKS OR TRY TO DETERMINE THE LOCATION WHERE IT IS GOING AND HAVE JUST BEEN TOLD THAT THIS MODEL ENGINE GOES THROUGH AT A FASTER PACE AND HAS BEEN A COMMON COMPLAINT AMONGST CUSTOMERS. IN ADDITION TO THIS I HAVE DEALT WITH HAVING TO GET THE SUNROOF RE-LUBRICATED EVERY FEW MONTHS, DEALING WITH RATTLES IN THE DOORS, WARPING OF THE INTERIOR (DASH, DOOR PANELS, SEAT BACKS), AND A ONE-TIME FAILURE WITH THE DOOR LATCH NOT WORKING DURING COLD TEMPERATURES.
NHTSA complaint #10456276 — an unverified report by a vehicle owner.
WHEN I PURCHASED MY PRE-OWNED 03 AUDI A4 CABRIO IN MAY 2010 FAILED TO NOTICE THAT THE BOTTOM LEFT AND RIGHT CORNERS OF THE REAR WINDOW WAS SEPARATING FROM THE FABRIC AT THE TOP. FAST FORWARD TO MAY 2011 ITS NOW SPREAD ENOUGH THAT YOU COULD REACH A WHOLE HAND INTO THE HEADLINER. WHEN IT RAINS PART OF THE BACK SEAT,REAR DECK AND AREAS OF THE TRUNK GET VERY WET WAS SEPARATING FROM THE FABRIC AT THE BOTTOM LEFT AND RIGHT CORNERS OF THE REAR WINDOW, ENOUGH THAT YOU COULD REACH A WHOLE HAND INTO THE HEADLINER. WHEN IT RAINS THE HEADLINER AROUND THE REAR GLASS, PART OF THE BACK SEAT,REAR DECK AND AREAS OF THE TRUNK GET VERY WET. WITH THE SMELL AFTER IT DRIES, IM SURE I HAVE MOLD AND MILDEW ISSUES AS WELL.
NHTSA complaint #10402500 — an unverified report by a vehicle owner.