Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2009 Mazda Mazda6 owners, lightly cleaned up (personal details are redacted by NHTSA).
My car had a air bag recal and a subframe and other misc recalls so I contacted the dealership near me which was In Springfield Mo and set a apt and had it replaced then got a call the next day saying they wuld meet me half way with a loaner car which was in Mansfield mo for the subframe replacement and they have had it for over a month and they called and told me it was ready for pick up 6/21/21 and I drove up there Wed to pick it up and it wuldnt start wuldnt do nothing dead battery. Dealership then hooked up a jump box the gauges started jumping all back and fourth like something was shorted or a short some were got it started and the min the jump box turned off the it killed all power the car shut completly off to nothing. …
The sensors on my alarm system will randomly activate, with alarm going off at 30 second intervals. The problem began approximately 6 months ago. I took the initiative to replace my cars battery, along with the battery in my fab. I really thought that solved my problem, as a first step fix. I began once again to identify the sound of my car alarm in multiple parking lots throughout time. I have been investigating this problem, and have read that this alarm problem has been sited by many Mazda 6 owners. I am the original owner of the 2009 Mazda 6 Grand Touring, and have 67,000 miles driven. I called the Repair Department at my dealership, and was told that it cost $185.00 for just the diagnosis. My auto insurance company policy price is based on using a secured vehicle. Right now I only can leave it unlocked in my garage, otherwise, my vehicle is at risk of being stolen.
The driver's side low beam headlight wiring harness melts and seems to be continuing problem. Even after replacing stock, (which melted,) with a better wiring harness it still began to melt and loose circuit, but like I said it was doing this before ever being replaced. Happens every couple months are so depending on amount of night driving. I have read several complaints about this happening to several owners of the same vehicle on the same drivers side with the same original harness and replacements doing this same melting and frequent on/off short circuit malfunctioning. Possibly causing a fire or fried wiring or loss of headlight causing unsafe conditions
Tl* the contact owns a 2009 Mazda 6. The contact smelled a strong burning odor inside and outside the vehicle. After entering the vehicle, there was evidence of an electrical fire. The fire department responded; however, there were no visible flames. The entire interior of the vehicle was covered with soot and smoke. The vehicle was towed to the dealer where it was dectected that the harness connector wires underneath the driver's seat were burnt and the fuse box overheated. The vehicle was repaired. Neither a fire nor a police report were filed. The manufacturer was not notified of the failure. The approximate failure mileage was 110,000.
The pressure or heat coming from muffler burnt back part of vehicular I am paying 1400.00 in wire repairs. Air bags recall, scars me don't have another car.the passenger door air noise escaping,melting dash board, alarm system goes of everyday up to 3to 4 times. Tire pressure, and engine light on.
I bought a used car with 2 dashboard light tmps & engine the dealer give me extra warranty but never been repair furthermore I find out by myself a recall for the outer door handles after the door open while I driving in the express way this happened to my youngest daughter; and in other 2 incidents the car do not respond with the appropriate speed causing me a big chance of accident afterwards it is happened again so due to other several mechanic problems and for security I have to decided to return the car now I have no money no car and a big problem I am having hardly time tried to summit my concerns because I think the dealers are responsible for sale security cars before the sale but apparently the laws are in the dealers side as a consumer I hope maybe some one can see how this irresponsible dealers play with the consumers safety. …
When ac or heat was on at any speed, it would run for a few mins. Then stop blowing out air before slowly dying out. It would make noise like it was trying to work again, but then wouldn't. Took it to Mazda dealership. They did "test on ac/HVAC system & found faulty control head due to electrical failure." they installed a heater control & the problem was fixed for a while. 3 months later same thing happened again. This time I was told the "HVAC blower motor was tripping out on internal thermal overload" so they replaced the HVAC blower motor. While that was getting fixed, I also had them look into another problem I was having. The TCS/dsc light would stay lit for 10-15 mins after I started my car and sometimes would just randomly come on while driving. …
The door lock actuators go bad on this car which causes the car to believe one of the doors is open when it is not. The dome lights are driven by the door actuators sensing that a door is open, so when you are driving, the interior lights will flash on and off. Very distracting, especially at night. The lights turning on and off only happens when the car is being driven, I have not noticed it when stationary. Usually it occurs during turns and the lights stay on for a few seconds. The door actuators are a common problem on this car and has many complaints about this issue online. This has been going on for several months now. The door actuator being faulty also causes the security alarm to go off and start sounding the car's horn sporadically. The car will be parked in a driveway with nobody around through all hours of the day and it will go off. …
Tl* the contact owns a 2009 Mazda 6. The contact stated that the dashboard was melting. As a result, the sun caused a glare which impaired the contact's vision. There was also a sticky substance present. The vehicle was not diagnosed or repaired. The contact also stated that the vehicle's alarm activated randomly. The failure recurred multiple times. The vehicle was taken to a dealer for diagnostic testing. The mechanic stated that the rear driver side door failed to close and the door latch was replaced. The failure recurred and the front passenger side door latch was replaced. The contact was made aware of NHTSA campaign number: 13V425000 (latches/locks/linkages); however, the VIN was not included. The manufacturer was not notified of the failure. The approximate failure mileage was 40,000.
The other day went to drive the car would not start. No acc on remote start button, key in ignition, still would not start. Checked all fuses, the battery. Took dash apart, removed stereo, checked all wiring harnesses all tested good. Had it towed up to olympia Mazda. They are currently troubleshooting. Recalled airbag was switched out a few years ago and the warning light came back on about a year later. Possibly the car thinks there has been an collison and the car is in lockdown mode. Technician was completely baffled. Will call them tomorrow and ask them to check the ECM, BCM or what not. Other than this. Have never had an mechanical issue with this car. Would purchase again.
Electrical complaints in other Mazda6 years
Frequently asked questions
How common are electrical problems on the 2009 Mazda Mazda6?
NHTSA has 32 complaints about the electrical system of the 2009 Mazda Mazda6, 8% of the model year's 386 complaints. The component named most often is horn (2 mentions).
Is there a recall for 2009 Mazda Mazda6 electrical problems?
No. NHTSA lists no electrical system recall for the 2009 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 2009 Mazda Mazda6 electrical problems start?
Half of the complaints with a recorded mileage happened before about 57,000 miles, and 13% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 3 fires and 0 injuries to electrical system 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.