Mazda CX-9 won't start problems

Filed Jun 5, 2026 · Fuel system · NC

Engine running rough. Check Engine Light illumination. Difficulty starting or a no-start condition. Noticeable loss of power during acceleration Check engine light P0192

Filed Apr 19, 2023 · Engine, Fuel system · FL

Driving home the car said 26 miles to E. while in gear going down the road it popped engine system malfunction and the whole car shut off and wouldn't start. Didn't drive the vehicle for 2 days- filled the gas tank and it drove fine for 5 days. Day 6- 4/8/2023, fine driving down the highway 45 minutes. Go down about a mile and it still doesn't seem right, I move lanes and the thermostat light starts flashing at 260, as soon as I make the turn it tells me to pull over and turn the car off-it was at 270. Go to drive across the street to get coolant later- car stalls when I shift into drive. Park it- get coolant takes an entire jug. Idling a little rough, but not bad. Mechanic he can't see any issues, computer is throwing out fuel system codes but no, issues that can be found. Does a tune up on it, pick it up. Smoking when I start the car and something smells burning. Driving home, it stalls again while in gar at a red light. RPM jumping between 500 and 750 while in gear. Park it for a few hours- everything seems fine. Drive 35 minutes- mostly highway. RPM isn't moving when in park vs neutral. While at last red light before home- engine system malfunction comes on. Driving a few miles down the road still on, temperature at 200. Drive about half a mile down the road- at 260 as I'm pulling into my driveway. Towed to Mazda the next day. Got diagnosis that the head lifted and coolant mixed into oil, flooding engine. Need a new engine and turbo- $10,000 to fix it. Never had issues prior and no signs of anything going wrong. Oil change done 2 weeks prior to this all starting.

Filed Jul 15, 2022 · Driver assistance, Engine · TN

On 04/21/22, I took my car to the dealer after noticing antifreeze on our garage floor and a burning smell. NO check engine lights had illuminated. They proceeded to tell me that there was a coolant leak from head/block and cavity leak (something about channel pressure). They also stated this was a casting flaw during manufacturing of the engine. They told me I needed a whole new engine for $8,479.97! Mazda corporate refused to replace the engine at their cost because I had 64,575 miles on it and it was out of powertrain warranty. I called them and asked to speak to a supervisor and never heard from them. I called on 4/26, 4/27, 4/28, 5/4, 5/5 (5 times), 6/9, & 6/20. I finally gave up agreed to pay $7,479.97 (the dealer gave me $1,000 off). I received the car back on 05/20 and it would not start later that day. They towed it back to Mazda and they replaced the crankshaft sensor that was damaged upon install of the new engine. I received it back again on 05/31 and later in the day, the check engine light came on and the automatic braking system engaged while I was driving (thankfully only 40 mph). I managed to pull over in a turn lane before the engine died. I was so thankful I did not make it onto the interstate I was about to enter! Mazda came and picked me up and later got my car. They could not figure out why it was dying and finally got it to recreate it. They replaced another engine sensor and then drove it a lot to make sure it was truly fixed. I finally received my vehicle back on 07/07. I am afraid to take my car out of town and it makes me nervous it will die and automatically start braking again. They KNOW this is a manufacturer issue and they refuse to take responsibility. I am so disappointed in them. This is a huge safety issue. I am also lucky I didn't blow a head gasket before I took it into the shop the first time.

Filed Jan 24, 2022 · Electrical · SD

multiple batteries replaced, after sitting for 24 hours the vehicle will not start. Believed to be the power liftgate module

Filed Sep 12, 2021 · Transmission · PA

Trans seems to slip going in and out of 4th gear. Just bought this car 3 days ago and it has been a consistent problem that didn't start until an hour after the purchase once it warmed up. Looks like it's the transfer case, this suv only has 106k on it ! This is absolutely ridiculous, Mazda needs to offer a recall for this issue so those who have the issue don't have to fork out MORE money for an issue that Mazda is well aware of with their vehicles

Filed Dec 17, 2020 · Engine · 97,000 miles · NJ

The radiator failed internally with no warning, no leaks no engine light nothing, mixing antifreeze into the oil and destroying the engine. My machine informed me that there was no way of me knowing this was happening and its faulty the way they make the radiator it causes this to happen. Now my radiator is bad and my engine. I was driving and suddenly a noise started then power went and pulled over and wouldn't start again. No warning nothing. No leaks no engine light prior.

Filed Jul 17, 2020 · Brakes · 105,000 miles · KY

Brake pedal has become harder than usual to depress and the car does not start stopping until the brake pedal is depressed harder and further down. Also there is a hissing noise once the car stops and the brake pedal goes further to the floorboard. Once stopped and sitting the car will lurch as if it has been hit in the rear end. This all happens on any type of roadway. This has been going on for about two months and getting more pronounced.

Filed Feb 5, 2020 · CA

I've had my mazda for only 3 years. I was driving up the hill towards my house to park my car and it just quit working. It shut off and now it will not start. Now I'm stuck paying $400 a month for a car that doesn't even work. It's very disappointing. I think this car should be recalled.

Filed Dec 10, 2018 · Driver assistance · 200,170 miles · IL

My vehicle bcm (body control module) have gone haywire for the second time this year. My dashboard warning signals appeared as I was driving locally. All gauges will drops down to zero, dash board warning lights will begin flashing off and on, my emergency lights will become disabled and there have been two occasions when my car refused to start. I started to notice that when the "at" light and the traction control symbol light are on the vehicle speed will not accelerate to the speed for which I'm pressing the gas. My initial takeoff is very slow. After the first no start I had my vehicle towed home and had to get a rental for a few days. This issue is currently ongoing after I made a service appointment with mazda, I also ended up driving the car in this condition to the dealership to see if I could get service started early and they weren't able to service me because they didn't have a loaner vehicle. I told them that I couldn't leave the car for this is my only transportation and I need a car to go back to work on friday. I was told that a lady should be bringing back a car the following day (thrusday) around noon if not they should have one on friday. Friday came no call from them, I called several times to only have my calls forward to a voicemail. So I called the parts dept. Told the person that answered that I was trying to contact someone in service regarding bringing in my vehicle for service. The part dept. Manager answered the phone and I told him who I am and he indicated again we don't have any loaner vehicle at this time, we should have one on monday, we have a couple of people getting recall parts replace and the parts are on back order. So now its monday the car is still unserviced and I just called to get the same response from the service dept., we have no loaner vehicle at this time. It should be recalled or the housing unit. It's dangerous!

Filed May 13, 2018 · Transmission · 62,000 miles · CA

This mazda cx-9 is a 2010 with about 62000 miles on it. I was driving on a highway with 70 MPH. Suddenly, I heard noise and crack. Shortly, after, the car lost power and it won't go forward. Took it to the mechanic and they found the power transfer unit broken. Replacement was $3000. Went back to my paperwork. Found that ptu is under extended warranty program including only 84 months or 90000 miles. I sent reimbursement to the mazda and they refused claiming that the car warranty is more than 84 months (which is not true). It is really disappointing that I have to hire a lawyer to get this flaw in mazda's design reimbursed. The warranty does not start on jan 1st of the manufacturing year. I had to pull the carfax to prove that they car was purchased after april of 2010 to prove the 84 months window is valid. They have this information but they decided to play ignorant. In any case, this a major flow in the cx-9 design for the ptu. They have to take responsibility for such flow and they need to be accountable for such sloppiness in their product that endangers lives on the street. All these cars should be taken off the streets.