During an inspection of my 2011 Audi Q5 at Audi Burlington, severe corrosion was discovered on the rear subframe, which supports rear suspension components. The corrosion was substantially worse than normal surface rust and may compromise the structural integrity of the subframe and suspension mounting points. The condition was not readily visible during ordinary vehicle use because portions of the subframe are covered. The vehicle has been operated in the northeastern United States, where road salt is used. I was advised that the rear subframe requires replacement at an estimated cost of approximately $5,884. I am concerned that continued deterioration could result in separation or movement of a suspension mounting point and a loss of vehicle control. Audi has not issued a recall or offered to cover the repair. I am aware of similar reports involving Audi Q5 rear subframe corrosion and request that NHTSA investigate whether the design permits moisture, salt and debris to remain against the subframe and cause premature structural corrosion.
NHTSA complaint #11755002 — an unverified report by a vehicle owner.
1) Rear subframe supports differential, axels, suspension, brakes, wheels and tires 2) If rear suspension fails , above noted assemblies will fall out of the car 3) Yes, dealer and independent garage have inspected and condemned 4) Manufacturer is aware of the problem, 5) No warnings or messages appeared, 6/29/26 at garage for oil change, garage was installing a subframe for another q5 so he was familiar with the issue
NHTSA complaint #11747832 — an unverified report by a vehicle owner.
My Q5 failed inspection due to a rusted subframe, so badly there is a huge hole in it. The dealership sent photos and notes to Audi but the dealership claims Audi denied my warranty claim (12 Year Corrosion Warranty) because it's not a body panel (the verbiage used in the warranty). However, Audi customer service told me it was because the dealership wrote a note that it was due to neglect. This is a safety defect that I was unaware of until now - I keep up with oil changes, have my car inspected every year and was never made aware of the problem until now so how would I be expected to know what was happening beneath my car. I've done lots of research online and this seems to be on the verge of becoming a common issue seen in 2010-2017 Q5s. So much so, there's a law firm investigating it like DiCello Levitt - could be a design flaw, there is a plastic covering known to trap moisture and debris. I also don't live in an area that gets much snow, some years we don't have any and I get monthly car washes.
NHTSA complaint #11738767 — an unverified report by a vehicle owner.
The rear sub frame has completely rusted through, on both driver and passenger sides. This makes the vehicle extremely unsafe to drive. It is a 2014 q5 with 160k miles. There is a hole on the bottom of the frame on both sides due to a poorly designed cover that traps salt and other road debris leading to premature failure.
NHTSA complaint #11735869 — an unverified report by a vehicle owner.
Severe corrosion of the rear subframe crossmember on a 2014 Audi Q5 Premium Plus, purchased with 65,464 miles. Two independent inspections in South Carolina confirmed structural failure. Audi of Greenville, an authorized Audi dealership, marked the condition as VERY DANGEROUS on the service invoice and quoted $4,711.52 for subframe replacement. They were unable to perform a wheel alignment due to the severity of the corrosion. Yoder's Automotive in Westminster, SC independently confirmed the subframe was rusted beyond repair on both sides. Fist-sized holes have corroded through the structural metal on both sides of the subframe. The vehicle has plastic stone guard covers bolted over the subframe from the factory. These covers trapped road salt and moisture against unpainted mild steel, accelerating concealed corrosion that was invisible until the covers were removed during inspection. The vehicle is undriveable and has not been driven since the defect was discovered in approximately March 2026. This defect pattern is documented in at least 16 prior NHTSA complaints for Audi Q5 models spanning model years 2010 through 2018. Audi has revised the subframe part number at least five times (8R0505235F through 8R0505235N) but has issued zero recalls and zero consumer notifications.
NHTSA complaint #11730241 — an unverified report by a vehicle owner.
This vintage 2014 Audi A5 has a well known serious rust perforation issue with the rear subframe. The corrosion / rust through of two major holes, approx 3 inches in diameter, causing structural failure of the sub frame. This is a major saftey concern with these cars from model year 2009 thru 2017. The only remedy is replacement of the sub frame under Audi's 12 year rust perforation warranty or good will.
NHTSA complaint #11729264 — an unverified report by a vehicle owner.
The motor mounts and control arms are defective. The defective motor mounts that secure the engine causes the engine to shake resulting in collapse while driving. Both front control arms over the wheels are defective make clicking noises when turning resulting in the collapse of the car while driving. These problems were discovered by the dealer during a routine maintenance inspection. The warning lights did appear to have the vehicle inspected,
NHTSA complaint #11708163 — an unverified report by a vehicle owner.
The front subframe on the vehicle is severely rusted and corroded through rust. Part of it has fallen off, and the rest of it is badly damaged. A structural integrity, a major safety risk. The Audi Dealer inspected it and confirmed. The car is unsafe to drive.
NHTSA complaint #11707367 — an unverified report by a vehicle owner.
Rear coil springs broke. No heavy duty cycle. 46,000 miles. Spring retention pads dislocated and destroyed. Powder coat anti rust prevention in 90% good shape. No reason for coil springs to break other than assembly defect or supplier material defect.
NHTSA complaint #11691311 — an unverified report by a vehicle owner.
2014 Audi rear subframe is rusted through. 92,000 Mi. My independent mechanic found the problem when performing suspension work. It has not been inspected by the dealer yet but will be soon. With the history of the subframe failures on these models and years, there is a danger to the public driving these vehicles on the road. Audi needs to fix these problems
NHTSA complaint #11684104 — an unverified report by a vehicle owner.
2015 Audi Q5 Quattro (all wheel drive). During recent inspection the vehicle was found to have extreme corrosion, cracking, and structural failure of the rear subframe and subframe crossmember. The rear steel subframe is manufactured as an assembly. The rear subframe assembly supports all of the rear suspension components and rear drivetrain and drivetrain components. My vehicle is always garaged and no other corrosion was found during inspection of the entire vehicle. The finding is a manufacturing defect that is only isolated to the rear subframe assembly of the vehicle. Due to the extreme nature of corrosion and cracking found on the subframe assembly this should be considered a high priority warning for Audi Q5 owners. A total failure of all rear suspension and drivetrain components may result.
NHTSA complaint #11681486 — an unverified report by a vehicle owner.
The front subframe has experienced catastrophic failure due to severe and premature rust-through corrosion. Multiple holes have perforated the component, compromising the vehicle's structural integrity. The part is available for inspection upon request. The safety of my family and others was put at significant risk, as the subframe is the primary component that mounts the engine, suspension, and steering rack to the vehicle. A failure of the subframe while driving could cause a complete loss of steering control and the collapse of the front suspension, leading to a serious or fatal crash. The problem was independently reproduced and confirmed by both an independent service center and an authorized Audi dealership. Both establishments have deemed the vehicle unsafe to drive due to this specific issue. The manufacturer (Audi of America) has been made aware of the issue through their dealership network. They have acknowledged the defect by offering a "goodwill" repair to replace the subframe, confirming their awareness of this failure mode. However, the manufacturer has made this safety-critical repair contingent on the owner first paying for several thousand dollars of unrelated maintenance items, creating a financial barrier that prevents the safety fix from being implemented. There were no warning lamps, messages, or other symptoms prior to the failure's discovery. This is a silent failure that provides no warning to the driver. It was only discovered during a routine service visit when the vehicle was on a lift.
NHTSA complaint #11678953 — an unverified report by a vehicle owner.
Severe Frame rusting of sub frame and crossmember. Rear of car affecting steering , tire aligment and wear. Swaying of rear end of car bouncy ride , wear or cracking of control arm and shocks.
NHTSA complaint #11678406 — an unverified report by a vehicle owner.
To Whom It May Concern, I am writing to formally report a serious safety issue involving my 2015 Audi Q5 TDI (VIN # [XXX] ), which has developed severe corrosion on the rear subframe. I am the original owner of this vehicle, which has 92,700 miles and has been garage-kept and exclusively serviced by authorized Audi dealerships since purchase. On [XXX], following a failed Virginia State safety inspection, the vehicle was inspected by Audi of Chantilly, VA. Their service department confirmed that the rear subframe is cracked due to extensive rust and recommended immediate repair. I have attached both the inspection report and supporting photographs. This is not an isolated case. Numerous Audi Q5 owners have documented similar corrosion on the rear subframe, often attributed to a plastic cover that traps moisture and accelerates rusting. This appears to be a design defect with potentially dangerous implications. As it stands, the vehicle is not drivable. The compromised subframe poses a serious risk of structural failure while in motion, increasing the potential for loss of control, a crash, or injury. The dealership has estimated repairs at over $9,000, which I am currently seeking coverage for through Audi Customer Service. However, Audi has indicated that their corrosion warranty covers only body panels—not subframe components—despite the fact that the defect stems from their design. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11667941 — an unverified report by a vehicle owner.
The rear passenger side suspension coil was found broken with a clean break but embedded into the coil boot during a 70k service at the Audi dealer with ~61k miles. No alarming condition of the failure was present, and if it would have dislodged while at speed on the interstate would have resulted in complete loss of control and bodily harm to the driver as well as other vehicles on the road. This was a CPO vehicle garage kept and routinely serviced by Audi, yet they denied any liability and provided no assistance when I escalated to corporate due to being out of CPO warranty by ~2 months. As a result, I had an independent VW specialist shop perform the work, document the observations as if they were to be subpoenaed in the future, and provide me all the parts from the repair (which I still have). The spring coating is completely intact on both rear coils and during the repair process it is evident that the part number has changed from what was originally installed to the current version. The clean break suggests part defect either in design for use or in the spring manufacture. Further investigation on various Audi forums as well as the NHTSA shows this is a prevalent failure for the 2018 Q5 and Audi should be doing something about this.
NHTSA complaint #11662908 — an unverified report by a vehicle owner.
Rear subframe rust causing car to fail state inspection. This vehicle has been maintained well and always parked in garage. The rear subframe rusted most, then front subframe. This is a common compliant among Audi forum users.
NHTSA complaint #11655321 — an unverified report by a vehicle owner.
The Audi technician discovered that the rear subframe had rusted through completely, which they deemed very unsafe and recommended replacing the subframe.
NHTSA complaint #11645696 — an unverified report by a vehicle owner.
Took my vehicle in for an alignment, was told by my local Audi dealer the rear subframe has rotted through and will need to be replaced. I asked how could this happen on a vehicle under 10 years? They said they see a lot of Q5's with similar rust issues due to a design flaw where a plastic protective cover cups and holds water directly on the structural part of the vehicle. They quoted me $8,000 to fix and offered no assistance on the price. Many, MANY others in forums and social media pages have the same issue and are forced to pay out of pocket for this issue caused by Audi.
NHTSA complaint #11640211 — an unverified report by a vehicle owner.