2021 Mazda CX-30 engine problems

Related recalls

No recalls on file.

What owners say

1. Filed Jul 5, 2026ALEngine

   Excessive oil consumption. Regularly have a low oil warning come up about 6000 kms after an oil change. Oil is always low when checked.

   NHTSA complaint #11748372 · source
2. Filed Apr 29, 2026MAEngineOther / UnknownTransmission & Drivetrain

   While driving, on approach to a stop signal, at an intersection the car stopped moving. The display said engine malfunction, have inspected. The electronics and engine continued to operate, but the car would not move when gas pedal was depressed. I shut off and restarted my vehicle numerous times, with no effect on the problem, the car still would not move. The vehicle behind me had to brake unexpectedly, and I could have been hit by others in the intersection, there could…

   NHTSA complaint #11734603 · source
3. Filed Feb 24, 2025ILElectrical SystemEngineTransmission & Drivetrain

   As reported by others, Engine Malfunction light came on. Car running rough. Mazda dealer says corroded wiring harness and $5k to replace. They bypass the conventional repair and splice it in. Within a hour of driving after pick up, same engine malfunction light and rough running returns. This time they said I need a new transmission. Electrical issues and faulty transmission are both dangerous. With as much posted online regarding the transmission, I would hope to find a…

   NHTSA complaint #11644437 · source
4. Filed Dec 5, 2024NJEngineTransmission & Drivetrain

   Received a "LOW ENGINE OIL LEVEL” warning message before the regular oil change interval of 7,500. Light came on 11/20/24 after purchasing the vehicle from a Mazda dealership 8/10/24 (~3 months). Model and VIN were impacted by the Mazda Valve Stem Seal Settlement. This issue was not disclosed by the dealer.

   NHTSA complaint #11629133 · source
5. Filed Sep 26, 202430,590 miTXElectrical SystemEngine

   The contact owns a 2021 Mazda CX-30. The contact stated while driving 65 MPH, the vehicle stalled. The messages "Engine Malfunction" and "Computer System Issues" were displayed. The contact was able to pull over to the side of the road. Another driver assisted the contact in jumpstarting the vehicle. The contact was able to drive to her friend's residence. The contact then drove to her residence the following day. The contact stated while starting the vehicle, the vehicle…

   NHTSA complaint #11616571 · source
6. Filed Aug 17, 2024NYEngineAcceleration & Cruise ControlTransmission & Drivetrain

   While I was driving on I-90, I lost control of the acceleration of my vehicle. The vehicle was towed and has been diagnosed with a failed transmission! The car would not accelerate or it would accelerate in bursts or rapidly slow down. I was able to pull over and the car failed to move at all after. My safety and others was put at risk as I lost the ability to control the speed of the vehicle on a road where the speed limit is 65mph in traffic around me. When the problem…

   NHTSA complaint #11609112 · source
7. Filed Jun 27, 2024NCEngineAcceleration & Cruise Control

   Car lunged forward when lightly stepping on the gas while making a turn onto a busy street. Then it later lagged in responding when I stepped on the gas. About 5 minutes later, the car dashboard lit up and said there was a transmission error. Mechanic's diagnosis found code P0756 for a shift solenoid B stuck off. The car is unsafe to drive.

   NHTSA complaint #11597248 · source
8. Filed May 20, 2024CAEngineFuel, Hybrid & EV Propulsion

   Low engine oil light is on again, I had one at 4600 miles and keep happening every 5-6000 miles. I had 7!! oil changes on a car that is 2.5 years old and it is at 29000 miles. I am sitting at the dealership and they are telling me nothing is wrong and despite of the valve stem cap replacement available they are not willing to replace it. In addition I had my battery die and needed to be replaced at 23 months after purchasing a brand new car - due to a faulty system. This is…

   NHTSA complaint #11589759 · source
9. Filed Mar 12, 2024VAEngineTransmission & Drivetrain

   On multiple occasions, low oil warning lamp illuminates and I have confirmed low oil level. Dealer is unable to confirm and refuses to address Mazda TSB because oil level is no longer low since I topped it up. The failure lies in the valve seal assembly. My safety and that of my passengers is affected because in the event of a low oil incident, my ability to safely drive the speed limit and/or accelerate quickly is compromised. Should a catastrophic failure occur, engine…

   NHTSA complaint #11576891 · source
10. Filed Jan 23, 2024FLElectrical SystemEngine

    I'm getting a critical engine error with the car saying I have low oil pressure. The dealership has looked and said that they can't fix it. They said I can drive it with the warning up

    NHTSA complaint #11567266 · source
11. Filed Jan 19, 202436,500 miGATowedEngine

    The contact owns a 2021 Mazda CX-30. The contact stated that while the contact's wife was driving at an undisclosed speed, several unknown warning lights illuminated. The contact stated that the vehicle decelerated to 20 MPH. The contact's wife drove the vehicle to a safe location and parked the vehicle. The vehicle was towed to an independent mechanic, but the mechanic was unable to duplicate the failure. The contact stated that the independent mechanic reset the codes and…

    NHTSA complaint #11566456 · source
12. Filed Nov 22, 2023CAEngine

    Engine is burning an excessive amount of oil. After numerous times to the dealership Mazda has finally okay the "fix" to be done to the car. What this "fix" is I do not know.

    NHTSA complaint #11556421 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology