Mazda CX-5 loss of power problems

Filed Oct 13, 2026 · MD

VEHICLE SAFETY COMPLETELY COMPROMISED BY UNEXPECTED ENGINE STALL IN TRAFFIC. For over one week, my 2024 Mazda CX-5 exhibited severe engine sputtering and erratic idle RPM fluctuations (RPMs surging high, then dropping dangerously low) while stopping. while completely stopped in a parking lot with the transmission engaged in DRIVE, the engine lost all propulsion and suffered a hard stall. The vehicle failed to automatically restart when my foot was removed from the brake pedal. This bypasses the parameters of the i-stop feature and represents a complete powertrain shutdown. I was forced to put the vehicle in Park and manually cycle the push-button ignition to restart the engine. This unpredictable loss of engine power while positioned in active traffic poses an immediate accident and safety hazard. The vehicle was brought to an authorized Mazda dealership for immediate evaluation. The service department stated they "could not replicate" the stalling behavior during their road test and returned the vehicle without a repair. However, I have documented the severe RPM fluctuations and the complete engine stall on a clear dashboard video recording, proving the failure mode exists. I also have a case number with Mazda

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 Sep 4, 2026 · Steering · PA

Component failure: potential thermal (heat-related) breakdown of the EPS control module, steering rack electronics, or associated wiring harness. Description: After approximately two hours of continuous highway driving, a critical Red Steering Wheel Warning Light illuminates intermittently in the center dashboard. This indicates a severe system fault and imminent threat of total loss of power steering assist while operating at highway speeds presenting an extreme safety hazard. The vehicle is under the bumper-to-bumper warranty and was brought to authorized Mazda service for the warranty repair. The dealership refused to perform a deep electronic diagnostic of the EPS module. The service manager released the vehicle back to me, claiming the issue cannot be duplicated unless it is driven for two hours and no active codes are showing. He is claiming this is a lane assist issue and the vehicle is safe. This is not a lane assist issue as it was occurring for the complete two hour trip and not on a specific road area that the lane assist could not detect. By refusing to escalate a critical steering failure to manufacturer engineers, the dealership has forced me to continue driving a potentially unsafe vehicle with a known steering defect in order to “prove” the malfunction occurs.

Filed Aug 28, 2026 · Engine, Fuel system · NJ

2019 Mazda CX-5 developed P0192-00 fuel-pressure-related fault and significant loss of acceleration/limp mode. Mazda dealership diagnosed fuel rail/injector-seal issue and performed approximately $2,836 in repairs. The condition was not corrected. Dealer now diagnoses a high-pressure fuel-pump failure and is requesting an additional $1,459. Vehicle has experienced loss of power while driving. There is an existing Mazda fuel-pump recall affecting some 2018–2019 CX-5 vehicles, but Mazda says my VIN is outside the recall population. I am concerned about a potential fuel-system safety defect.

Filed Jul 1, 2026 · Transmission · CA

My Mazda 2018, CX-5, Grand Touring, was diagnosed with a cracked cylinder head at 64,599 miles. This issue could posed a safety hazard for not only us but others on the road by: *Engine Failure / Sudden Loss of Power-A crack allows coolant and oil to mix or leak, leading to overheating and potential catastrophic engine seizure. A seized engine can cause sudden, unexpected loss of power — especially dangerous at highway speeds or during lane changes/merges. *Oil and Coolant on the Road-Leaking fluids drip onto the roadway, creating slick surfaces for motorcyclists and other vehicles — similar to a spilled oil hazard. This is especially dangerous on curves and in wet conditions. *White Smoke / Steam Billowing from Exhaust-When coolant enters the combustion chamber, it burns off as thick white smoke. This can instantly reduce visibility for drivers behind the vehicle, potentially causing rear-end collisions. *Fire Risk-If oil leaks onto hot exhaust manifolds or engine components, it can ignite. An engine fire can spread quickly and, in traffic, puts surrounding vehicles and occupants at risk. *Debris from Engine Destruction-In extreme cases, a severely overheated or seized engine can cause internal components to fail violently. Debris from a catastrophic engine failure can damage undercarriages of nearby vehicles or become road hazards. *Stalling in High-Risk Locations-A vehicle that stalls due to engine failure in a tunnel, on a freeway on-ramp, in an intersection, or on a bridge creates an immediate collision risk for surrounding traffic. This is part of why Mazda's handling of the cylinder head defect is so problematic — it's not merely a costly repair, it's a public safety issue that arguably warrants regulatory attention (the federal safety agency). We had NO warning lights, no overheating issues. Repairs have been made to the cost of almost $5400.00 *Please note there are many, many people complaining of this same issue on this model of car in multiple on-line forums.

Filed Jun 9, 2026 · Engine · CA

On May 11th I was driving my 2019 Mazda CX-5 with approximately 35,000 miles when my cabin filled with the smell of gasoline. The smell became overwhelming within minutes, causing concern for my safety and the safety of other drivers. I immediately drove to the closest auto repair/body shop for an emergency inspection. Upon inspection, the technicians discovered there was a "crack at rear cylinder head and leaking oil excessively. Oil is leaking on to hot exhaust manifold....car is not safe to drive since oil leak is excessive". I was advised that this must be a manufacturer defect as you should not see this issue at such low mileage. The vehicle was then towed to the nearest Mazda dealership/service center, where a cracked rear cylinder head was diagnosed and confirmed. I was informed that continued operation of the vehicle could have resulted in catastrophic engine failure, engine seizure, fire risk from leaking oil contacting hot engine components, or sudden loss of power while driving, creating an extremely dangerous driving situation. Prior to the failure, there were no major warning indicators other than the sudden strong fuel/oil smell. The issue occurred unexpectedly despite the vehicle being properly maintained and having low mileage for a major engine failure. I have been the sole owner. The vehicle is currently available for inspection upon request.

Filed Apr 8, 2026 · Engine, Fuel system · IA

The car has signs of current recall in other Cx-5 Models. Hesitation with acceleration or driving at high speed, reduced power, not responding appropriately when accelerating or would accelerate on its own, strong smell of gas after the car has been driven and is parked. I know there is currently a recall for a gas pump failure. There is no engine light on.

Filed Mar 23, 2026 · Brakes, Engine · CA

Incident Description: On multiple occasions in January and February 2026, while operating a 2024 Mazda CX-5 in reverse on low-friction surfaces (snow/ice) with a slight incline, the vehicle suffered a total systemic failure. System Failures: While reversing at low speeds, the engine spontaneously shut off without warning. This resulted in an immediate loss of power braking and power steering. Simultaneously, the electronic gear selector (shifter) became non-functional, preventing the vehicle from being placed into 'Park' to stop the uncontrolled rearward slide. Safety Risk: The vehicle became a "runaway" object on several occasions. In one instance, the vehicle narrowly avoided crushing a pedestrian against another parked car, stopping only when the tires reached a different surface texture. In a separate incident, the vehicle slid uncontrolled down a residential hill, striking snowbanks. There is a grave concern regarding whether the Supplemental Restraint System (airbags) remains functional during these engine-stall events, as the dealer could not confirm occupant protection status during a total power loss. Inspection & Reproduction: The vehicle was presented to an authorized Mazda dealer on March 3, 2026. The service department attempted to replicate the issue by reversing over soapy water on a gravel surface. However, due to the high friction of the gravel, they were unable to induce the specific tire-slip/low-traction conditions required to trigger the malfunction. No error codes were found during an informal scan, and no warning lamps or messages appeared prior to or during the failures. Component for Inspection: The vehicle is available for inspection. I believe the failure is rooted in the traction control or engine management software, which appears to improperly shut down the powertrain when it detects specific wheel-spin patterns in reverse, subsequently disabling critical safety systems including brakes and transmission locks.

Filed Mar 7, 2026 · Engine · KY

Vehicle developed burning oil smell. Dealership diagnosed a cracked cylinder head. No warning lights (yet. Eventually low oil pressure light would come on.) Potential for engine to lock up and lose power while driving putting occupants and others at risk. Know problem for 2018-2021 model years. Car no longer under warranty. Cost to repair $7,100. Technical Service Bulletin SA-031-21 issued regarding this problem.

Filed Feb 25, 2026 · Engine · SD

The engine cylinder head cracked and is leaking engine oil. This component is available for inspection at Liberty Mazda or by an independent certified mechanic upon request. The cracked cylinder head caused significant engine oil leakage, which created the following safety risks: Sudden loss of engine power or stalling while driving Smoke emission from the engine bay Potential fire hazard if leaking oil contacted hot engine components These conditions placed both the driver, passengers, and others on the road at risk. The cracked cylinder head and associated oil leak were diagnosed and confirmed by Liberty Mazda, the authorized dealership that performed prior repairs on this vehicle. The dealership documented the issue and provided a repair estimate of approximately $5,400. No independent service center has inspected the vehicle at this time. The vehicle and cylinder head have only been inspected by Liberty Mazda. Mazda Corporate has not physically inspected the vehicle, but all service records and documentation of prior repairs have been submitted to them during the warranty dispute process. There has been no inspection by police, insurance representatives, or other third parties May 2025: The vehicle intermittently struggled to accelerate. At that time, no dashboard warning lamps illuminated, and the dealership initially reported no issues. June 2025: Following the timing cover repair, the vehicle experienced engine oil leakage due to incorrect sealant installation, which was documented. February 10, 2026: The dealership repaired the oil pan seal and replaced the sealant, refilling engine oil. February 14–15, 2026: Approximately four to five days after the February 10 service, the cylinder head cracked, causing a significant oil leak. All symptoms and related service events are documented in Liberty Mazda’s service records.