2016 Mazda CX-5

I own a 2016 Mazda CX-5 Touring with AWD. I purchased it brand new from a dealer--no miles on it. It's been a great car until this Sudden Unintended Acceleration problem (about 60K miles now). It's happened 5 or 6 times--twice when in a drive thru. It seems that if I am idling (not pressing on gas or brake) the car will sometimes suddenly accelerate. I have used suggestions to brake, then place car in neutral. That seemed to resolve the problem. However, recently I pulled up to my (rural) mailbox and the car tried to accelerate out of control. I had the brake on (was on a downhill) when it happened, so this was scary. I really had to press down more on the brake pedal, then shifted to neutral, then to park. The acceleration finally stopped. I did not observe tachometer readings during this or other events, but will pay more attention if/when this happens in the future. I do not drive with both feet, and as these incidents have occurred I have been able to maintain more composure and analyze what is going on. I am not getting my foot caught in the mat and I'm not mistakenly pressing on the accelerator. I've been to my local Mazda dealer (Sport Durst in Durham) on May 13, 2022 and they were unable to replicate the problem, so could not repair or even troubleshoot it. The car was T-boned about a year ago, with some damage to the passenger front tire. Could that have anything to do with my problems? My partner feels this could be an issue with the Throttle Control Sensor (hardware) or with the software managing throttle control (much more difficult to diagnose, he says). I wanted to ask: for anyone experiencing this problem, did replacing the Throttle Control Sensor or diagnosing software problems resolve the issue? And, do you have any recommendations for me? Since the car is (barely) out of warranty, (just over 6 yrs/60,000 miles) would filing a claim with Mazda be a good approach? Would you suggest I just trade the car in?

The contact owns a 2016 Mazda CX-5. The contact stated that upon depression of the brake pedal, the engine revved violently without warning. The contact would depress the brake pedal to the floorboard and place the vehicle into park(P) to prevent the vehicle from independently accelerating. The contact had taken the vehicle to a dealer and was informed that the air box was defective. The dealer repaired the vehicle; however, the failure recurred. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 50,000.

My problem is with the keyless start system. The problem is that if I forget to push the start button to shut down the vehicle and open the door and leave the automobile and shut the door with the key in my possession the auto will keep running until it runs out of fuel. Wouldn't it make more sense for the vehicle to shut down after 3 minutes if the key is not present. As you know people have died from carbon monoxide poisoning by parking in their garage and forgetting to shut down the vehicle and the vehicle keeps running and filling their homes with carbon monoxide. This happened to a older couple in Sarasota Florida with a new car that they just purchased and were not familiar with the starting system. Just wanted to know just how many people have to die before something is done about this problem. I asked my Mazda dealer and they told me that the vehicle will run until out of fuel and basically said that I was stupid for being concerned.

Original belt tensioner was failing at 50k miles. An oem mazda belt tensioner was installed and is failing again within 1 year at 67k miles. If this fails the belt powering the water pump will fail causing a catastrophic engine failure due to overheating. Mazda has yet to issue a recall with their defective parts. If you hear any squeaking of the belts from your engine and notice any residue leaking from the tensioner get it replaced ASAP or your car could become a hazard.

DURING A ROUTINE INSPECTION BY THE DEALER FOLLOWING AN OIL CHANGE THE MECHANIC DISCOVERED THAT THE DRIVE BELT TENSIONER HAD BEGUN TO LEAK AND IF NOT REPLACED (AT $400) WILL CAUSE THE ENGINE TO FAIL AND WILL STRAND MOTORIST. CURRENT MILEAGE 53, 824. WITH LITTLE EFFORT I DISCOVERED THAT THIS IS A WELL-KNOWN PROBLEM WITH THIS VEHICLE WITH MANY FAILING AT AROUND THE 30K MILE MARK. LOOKS LIKE A DESIGN FLAW THAT MAZDA USA IS PASSING ONTO THE CONSUMER.

I WENT TO THE DEALERSHIP AND THEY INFORMED ME THAT THE HYDRAULIC BELT TENSIONER WAS LEAKING. THEY QUOTED ME $400 FOR REPAIR AND STATED THIS IS A WEAR ITEM YET THE MANUAL AND USER GUIDE PROVIDED BY MAZDA DO NOT STATE THAT THIS IS REQUIRED TO BE REPLACED ONLY INSPECTED. MY CAR HAS LESS THEN 46,000 MILES AND THIS PART WAS NEARLY AT THE POINT OF FAILURE. IF THIS PART FAILS AND THE BELT GETS TOO LOOSE OR SNAPS, YOUR CAR WILL SHUT DOWN. ESSENTIALLY, IF THAT BELT BREAKS, YOUR ALTERNATOR WILL STOP CHARGING THE BATTERY, THE DASH WILL LIGHT UP LIKE A CHRISTMAS TREE, AND THE CAR WILL SPUTTER TO A COMPLETE STOP. NOT TO MENTION THE FACT THAT THE BELT ALSO TURNS THE WATER PUMP. SO WHILE THE CAR COULD SHUT DOWN IN ORDER TO AVOID OVERHEATING. MAZDA HAS STATED THEY WILL NOT COVER THIS AS IT'S OUT OF WARRANTY FOR A WHAT SHOULD BE CONSIDERED A DEFECTIVE PART. IF YOU HEAR KNOCKING SOUNDS FROM YOUR ENGINE GET YOUR VEHICLE INSPECTED ASAP!

TL* THE CONTACT OWNS A 2016 MAZDA CX-5. WHILE DRIVING 65 MPH, THERE WAS A POPPING NOISE AND BLACK SMOKE COMING FROM THE ENGINE COMPARTMENT. ALL THE WARNING INDICATORS ILLUMINATED ON THE INSTRUMENT PANEL. THE CONTACT COASTED THE VEHICLE OVER TO THE SIDE OF THE ROAD AND HEARD ANOTHER POPPING NOISE. THE CONTACT THEN NOTICED FLAMES UNDER THE HOOD. THE CONTACT EXTINGUISHED THE FIRE HIMSELF. THE VEHICLE WAS TOWED TO CAPITOL MAZDA (LOCATED AT 980 CAPITOL EXPRESSWAY AUTO MALL, SAN JOSE, CA 95136, (408) 763-4018) WHERE IT WAS DIAGNOSED THAT THE ENGINE BLOCK FAILED AND THE ENGINE ROD WAS FRACTURED. THE DEALER STATED THAT THE ENGINE NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND PROVIDED CASE NUMBER: 1-1844061638. THE APPROXIMATE FAILURE MILEAGE WAS 62,000.

STARTED CAR IN DRIVEWAY 2/10/19, 4 PM 'ENGINE SOUNDED LIKE TIMING WAS OBVIOUSLY ABNORMAL. RANDOM AUTOMATIC BRAKING NOTED WHEN CAR IN MOTION, WITHIN ONE BLOCK OF LEAVING DRIVEWAY. IMMEDIATE INABILITY TO ACCELERATE BEYOND 10-12 MPH EXPERIENCED. ERROR MESSAGES THEN OBSERVED ON CAR DASHBOARD WARNING SECTORS: CHECK ENGINE; TRACTION CONTROL: TIRE PRESSURE MONITORING; SMART CITY BRAKE SUPPORT MALFUNCTION-FORWARD SCBS DISABLED. CAR UNSAFE TO DRIVE TO DEALER 12 MILES AWAY. CAR TOWED TO DEALER SITE 2/11/19 MONDAY AM. CAR HAS 28,330 MILES PER ODOMETER; SERVICE MAINTENANCE UP TO DATE, AS MANUFACTURER RECOMMENDED. DEALER ASSESSMENT OF CAUSE ON 2/11/19 REPORTED AS 'RATS NESTING IN ENGINE AND EATING THROUGH SOY INSULTATION ON WIRING ON ENGINE HARNESS.' REPAIR COSTS OF > $1,500 ESTIMATED. IT SEEMS THAT INSULATING ENGINE COMPONENT WITH NUTRIENTS ATTRACTIVE TO NESTING, UBIQUITOUS VERMIN IS A SERIOUS SAFETY CONCERN FOR CAR OWNERS AND USERS. ANY NHTSA GUIDANCE ON THIS CRITICAL ISSUE?