Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2010 Mazda Mazda6 owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2010 Mazda Mazda6 . The contact stated while driving approximately 25 mph and drove over a bump and lost control of the vehicle and crashed into another vehicle. The contact stated the disc off warning light was illuminated. The contact stated no one was injured nor sought medical attention. A police report was not filed. The vehicle was not drivable. The contact was towed to her residence and then to a local dealer, where it was diagnosed with the rear structure was corroded and needed to be replaced. The vehicle was not repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 180,000. The contact stated that the dealership deemed the vehicle unsafe to bring to the shop and therefore did not perform the necessary repairs in the recall. The dealer notified the contact about that as well as the manufacturer. …
The contact owns a 2010 Mazda Mazda6. The contact stated that the vehicle had previously been serviced at the dealer under NHTSA Campaign Number: 18V631000 (Suspension, Structure). The contact stated that while driving at an undisclosed speed, she lost control of the vehicle. The failure caused the passenger's side rear tire to rub on the fender while driving. The vehicle was taken to an independent mechanic who diagnosed that the passenger's side rear subframe was severely corroded and had fractured in half. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 82,000.
The contact called on behalf of a client who owns a 2010 Mazda Mazda6. The contact stated that the steering wheel failed to operate as designed and the vehicle was pulling either to the left or the right. The vehicle was diagnosed that the rear passenger's side cross member was rusted and needed to be replaced. The dealer was notified of the failure and the contact was advised that the rear cross member was not covered. The vehicle was not repaired. The manufacturer was notified of the failure and the mechanic was informed that the customer was liable for the cost of the repair. The failure mileage was approximately 70,000.
The contact owns a 2010 Mazda Mazda6. The contact stated that while driving at an undisclosed speed, the rear frame detached from the vehicle. The contact stated that the vehicle was previously repaired under NHTSA Campaign Number: 18V631000 (Suspension, Structure) and the contact related the failure to the recall. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 160,000.
Crossmember rust from recall campaign 2818I is able to effect structural attachment despite recall work. The recall installed an "improved: cross member. This was not an actually replacement cross member, rather additional plate steel between the rear and front of the existing attachment points of the defective OE cross member. Improved cross member contains no provisions to support rapidly corroding lower control arm attachment point in original cross member. Added member for recall also does not appear to additionally support lateral stresses from control arm. Evaluation of original cross-member seemed inadequate to detect structural integrity based on condition of the cross member today. "improved" cross member does not support mounting points of the control arm. Based on recall documents, some "improved" cross members have supports for Lower Control Arm (LCA) mounts. …
I looked up recalls on my vehicle and it states that The 2011 Mazda6 is part of a recall (NHTSA 19V-323, Mazda 2818I) covering 2011-2013 models for front cross member (subframe) corrosion due to insufficient rust protection . In salt-belt states, this corrosion can cause the lower control arm to detach, reducing steering control and increasing crash risk. Key Details regarding the 2011 Mazda6 Subframe Recall: Scope: The recall affects specific 2011-2013 Mazda6 vehicles (and 2009-2010 models in a previous, related recall). Location Restrictions: Vehicles must have been originally sold in, or currently/previously registered in, 23 "salt belt" states (including CT, NY, MI, MN, OH, etc.). The Issue: The front cross member may experience severe corrosion, causing structural failure of the passenger-side lower control arm mounting point. …
The rear subframe is compromised; it separated from the body of the car. The vehicle is in my driveway and available for inspection should the need arise. The rear end had felt a bit shaky for a month so I took it to my mechanic, who declared the vehicle "unfit for the road" due to the fact that the subframe was rotted away and detached from the car itself. I was told one big bump is an accident waiting to happen...pieces of the car would go flying and I could be left with zero mobility to evade oncoming traffic. The possibility of projectiles injuring anyone around the car was enough for me to park it. The car has not been inspected by Mazda, the police, or insurance because there was no accident. Since it's not safe to drive, I took the word of my independent mechanic rather than driving it to a dealership. …
2010 mazda 6 i series sedan the entire rear subframe/cradle is rotted along with all the other parts connected to it, the A arm, bumper stops, control arms, rear sway bar the entire rear under carriage. took it to the shop and they said there have been several complaints about this exact issue on several of these cars from 09-13 models. the parts was not painted correctly like the front that was recalled. exposed to all weather elements, the shop wants almost 4k for labor only to fix but the main problem is finding the rear subframe on these cars is almost impossible next to cost a fortune. now i have a yard ornament. junk yard wants to give me 170 bucks for the car but im not doing that. Mazda needs to fix this issue. i would of never know it was rotted out unless i took it to the shop for rear swaying and sagging. its all over the road. …
I took car to dealership for recall repair (3) one of which was for front sub-frame corrision While it was there thet called Me and said that the rear sub-frame was rausted so bad it was unsafe to drive and that it would cost $4600 to fix it. It seems to Me if You aknowledge a corrision problem in the front then You would accept responsibility for rear. Mazda said that They would have fixed it if the title were not branded ? It was wrecked in the front end and I replaced hood grille bumper lights etc and has nothing to do with the rear sub-frame. The Mazda Forum say's that it is shoddy workmanship. This car only has 147,000 miles on it and runs like a new car. I am a US army Vet 10 years) and am retired and cannot afford to fix this on My own and this is about doing what is right so I am asking You to help Me to get this problem fixed so I can drive this car. Thank You,
The rear subframe is corroded with rust to the point of about to break into pieces. I did not have control of the vehicle and could not drive above 40mph, sudden pull to one side while braking, loose steering. I could have had a wreck if the subframe would have broke before taking the vehicle in to be inspected by an independent service center. I live over an hour to the nearest Mazda dealership and the car is not drivable. No warning lamps came on and I first noticed the problems around January 11,2023. The part looks completely tissue thin all over and the rest of the components look new bolted to it. I do have pictures from the independent service center. I think the car needs to be seen by a regional service manager like a Mazda engineer. This is not just rust this is a defective part that was to thin to begin with.
NHTSA investigations
Front Subframe Corrosion
In a letter dated September 14, 2018, Mazda North American Operations (Mazda) notified the National Highway Traffic Safety Administration (NHTSA) of a defect in the front subframe assemblies of model year (MY) 2009 through 2010 Mazda6 vehicles in certain states with high road salt use in winter months (Recall 18V-631).
Suspension complaints in other Mazda6 years
Frequently asked questions
How common are suspension problems on the 2010 Mazda Mazda6?
NHTSA has 43 complaints about the suspension of the 2010 Mazda Mazda6, 19% of the model year's 225 complaints.
Is there a recall for 2010 Mazda Mazda6 suspension problems?
No. NHTSA lists no suspension recall for the 2010 Mazda Mazda6, though it has 9 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2010 Mazda Mazda6 suspension problems start?
Half of the complaints with a recorded mileage happened before about 104,000 miles, and 4% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 0 fires and 0 injuries to suspension problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.