2017 Mazda CX-5: adaptive cruise control problems

Filed Oct 12, 2026 · Acceleration, Engine · CO

My 2017 Mazda CX-5 has experienced a recurring condition more than six times involving sudden jerking, rapid deceleration, and loss of normal accelerator response during extended highway driving, often while cruise control is engaged. On multiple occasions the engine has also shut down. On 09/11/2026, while traveling south on I-35 at approximately 80 mph with cruise control engaged, the vehicle suddenly began jerking violently and rapidly losing speed. Normal accelerator response was lost and a vehicle behind me nearly struck my vehicle. I was able to reach the shoulder just before the engine shut down. The vehicle would not restart and required towing. There was little or no meaningful warning before the loss of power. The vehicle was inspected by a Mazda dealer. I specifically reported the recurring highway jerking, deceleration, loss of throttle response, and shutdown concern. An aftermarket OBD-II device was removed after the dealer identified parasitic battery draw. The dealer subsequently stated in writing that the battery and alternator were healthy and that the vehicle was “operating as intended.” On 10/09/2026, with that device no longer installed, the same symptoms occurred again during highway travel and the vehicle again became disabled and required towing. The Mazda dealer has now verified the drivability concern and reported a Fuel Rail Pressure Sensor “A” Circuit Low fault and low fuel pressure. The dealer is recommending replacement of the high-pressure fuel pump as an initial repair, followed by further testing of the in-tank fuel pump. The vehicle is currently available for inspection at the Mazda dealer. the federal safety agency’s VIN lookup currently shows 0 unrepaired recalls. I am reporting this because sudden loss of acceleration and power at highway speed creates a serious collision and roadside safety risk.

Filed May 18, 2023 · Fuel system · PA

What component or system failed or malfunctioned, and is it available for inspection upon request? Sudden loss of power (and speed) on interstate highway at ~65 mph. Fuel level was under 1/4 tank level. Weather was clear and approx. 60-70 deg F. Cruise control was on and vehicle working normally for hours on the road trip with cruise control on and functioning properly on the highway. Suddenly, the vehicle lost power, check engine light came on, and vehicle was running very sporadic. P0192 code thrown. Low fuel pressure which resulted in car suddenly going into reduced power mode. Sudden loss of high pressure pump would have resulted in complete loss of propulsion, which did not occur in this case - this indicates low pressure from the in-tank LP fuel pump. How was your safety or the safety of others put at risk? Sudden and unexpected loss of power on the highway which could have resulted in rear end accident or loss of control while trying to get the vehicle off the highway. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes - if fuel tank level gets below 1/4 tank the problem will occur. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No - sudden loss of power and then engine light came on (constant, not flashing) and vehicle had sporadic power issues until we could get off the highway. Certified technician put scanner on car. Code was P0192 - low fuel rail pressure. Filled fuel tank to full, cleared code, and continued to drive car. Issue did not reoccur until fuel level fell below 1/4 level (approx.). 2017 Mazda CX5 is believed to have the same or similar low pressure fuel pump in tank, OEM = Denso, which is on recalled Mazda models from 2018 and newer. I believe older models of Mazda's with the same pumps should also be recalled!

Filed Feb 11, 2022 · Driver assistance · CA

The Adaptive Cruise Control system (collectively including the Lane Departure Warning, Forward Collision Warning, Smart city brake support etc.) on this SUV stops working abruptly and randomly while the car is in operation on the road. This is a major safety concern as it can crash into a leading vehicle in absence of adaptive cruise capabilities. The system generally resets or starts working again after a 5-10 minutes, but there is no rhyme or reason why it stopped working or when it would start again. It has happened in cloudy, harsh cold weather, and also on a bright, warm sunny day. This makes the ACC unreliable. The dealer could not reproduce the malfunction, as generally the car is stationary in the workshop or isn’t driven for a long enough time while testing.

Filed Mar 28, 2018 · Brakes, Driver assistance · 250 miles · FL

Two weeks after I got the vehicle, I was driving on a highway doing speeds of 45 to 74. The drivers land change assist was not working as a car was right beside me several times I noticed and the light was off. My son mentioned it. Dec 22, 2017 2) I was driving at dusk on cruise control 74 MPH and the car suddenly braked and a warning brake! Was on the dash. I was in the fast lane with no objects or car in front.

Filed Mar 1, 2018 · Acceleration · 17,000 miles · AZ

Tl* the contact owns a 2017 mazda cx-5. While driving 75 MPH, the vehicle recognition system was on while the preceding vehicle was driving at a slower speed. The contact attempted to switch lanes, but the vehicle would not decelerate on its own. The contact had to depress the brake pedal to prevent a crash. The contact turned the cruise control off and back on, and the vehicle was able to drive normally. The dealer (jim click mazda eastside, 1301 s wilmot rd, tucson, az 85711) was contacted. The manufacturer was not contacted. The vehicle was not diagnosed or repaired. The approximate failure mileage was 17,000.

Filed Jul 24, 2017 · Acceleration, Brakes · 740 miles · NV

According to consumer reports (aug. 2017, page 58, last paragraph) the mazda's new cx-5's forward collision warning with low-speed automatic emergency braking standard should be applauded. These features malfunctions in las vegas during hot weather. Mazda knows about the problem and has no fix. We bought a mazda cx-5 on june 9, 2017. While driving on the freeway on july 21, 2017 the car quit working properly and we had three warning messages come up on the dashboard: 1.smart city brake support malfunction 2.smart brake system malfunction 3. Forward camera malfunction. Had I not been paying close attention while using the cruise control the car might have rear-ended the car in front at 60 MPH. The dealer service staff I talked to on the phone when I got home said that mazda knew about the failures. Mazda said these errors are caused by excessive heat and mazda has had many complaints in many locations. There is presently no fix. It seems to work ok when the weather is cooler. These are safety features we purchased and they failed while we were driving in las vegas. The temperature was 104 at the time. Not excessive for las vegas nor other parts of the southwest desert. I currently have pictures of two of the warning messages that flashed on the dashboard and can be seen at https://photos.app.goo.gl/0mfdpf5wzvoux2sp2. This seems like a major flaw of the mazda cx-5 if their premier package safety features fails to work when the outside temperature is around 104. The car should not be recommended, or even sold, with these features until mazda gets this fixed. Maybe other mazda models have this flaw.