2021 Mazda CX-30 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
100 owner complaints analyzed
2 distinct recall campaigns
5,078 mi median reported failure mileage
Scope: 2021 model year. Data snapshot: . 13 complaints include usable failure mileage.
Most common problems
Engine is the most frequently named component, appearing in 49 of 100 complaints (49.0%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 15 | 15.0% |
| Electrical and battery issues | 11 | 11.0% |
| Transmission and shifting | 4 | 4.0% |
| Engine operation | 2 | 2.0% |
| Steering behavior | 2 | 2.0% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Engine | 49 |
| Electrical System | 13 |
| Unknown Or Other | 10 |
| Visibility/Wiper | 9 |
| Power Train | 8 |
| Vehicle Speed Control | 7 |
| Service Brakes | 6 |
| Forward Collision Avoidance: Automatic Emergency Braking | 5 |
Engine: 49; Electrical System: 13; Unknown Or Other: 10; Visibility/Wiper: 9; Power Train: 8; Vehicle Speed Control: 7; Service Brakes: 6; Forward Collision Avoidance: Automatic Emergency Braking: 5
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 9 |
| 25,000 to 49,999 | 4 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 9; 25,000 to 49,999: 4; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (9). 87 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2021 | 8 |
| 2022 | 37 |
| 2023 | 23 |
| 2024 | 17 |
| 2025 | 7 |
| 2026 | 8 |
2021: 8; 2022: 37; 2023: 23; 2024: 17; 2025: 7; 2026: 8
Pattern summary
Engine leads the component reports. Braking behavior appears in 15 complaint narratives. Electrical and battery issues appears in 11 complaint narratives. Transmission and shifting appears in 4 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11416800 · 2021-05-16 (May 16, 2021)
AFTER TURNING LEFT AT A SIGNALED INTERSECTION ONTO A HIGHWAY THE AUTOMATIC BRAKING ENGAGED AND THE CAR SKIDDED TO A STOP IN THE MIDDLE OF THE LANE. LUCKILY NOBODY WAS BEHIND US. THERE WAS A CAR ABOUT 4 CAR LENGTHS AHEAD THAT WAS GOING THE SAME SPEED AND WAS NOT STOPPED. I PULLED OVER AND CHECKED THE FRONT SENSOR AND NOTICED A COUPLE BLACK FLIES ON IT AND BRUSHED THEM OFF.
Owner-reported narrative. 5,078 miles reported. Look up ODI 11416800 at NHTSA ↗
Owner report 11418296 · 2021-05-24 (May 24, 2021)
Sudden, enexpected emergency braking when there was no vehicle or any other obstruction in front of me. Luckily, the distance between me and the car behind me was great enough to prevent me from being rear ended.
Owner-reported narrative. Look up ODI 11418296 at NHTSA ↗
Owner report 11438463 · 2021-10-28 (October 28, 2021)
The contact leased a 2021 Mazda CX-30. The contact stated that the vehicle had failed to start up after multiple attempts with several unknown warning lights illuminated on the instrument panel. The contact stated that an unauthorized independent tow company towed the vehicle to a dealer two hours away from her home and that the vehicle was stolen from the dealer's lot. A police report was filed. The contact then stated that the vehicle was recovered and returned to the same dealer. The battery was replaced, and the vehicle was towed to an auto…
Owner-reported narrative. 2,100 miles reported. Look up ODI 11438463 at NHTSA ↗
Owner report 11484146 · 2022-09-12 (September 12, 2022)
I am constantly receiving a “Low Battery Voltage Warning” for reasons as simple as leaving my door or trunk open for 10 minutes. I never leave my car in accessory mode to play music or anything that might drain the battery. It happens several times a month for no reason. I have not had it die on me yet, but I don’t know if it’s actually a low battery or software glitch.
Owner-reported narrative. Look up ODI 11484146 at NHTSA ↗
Owner report 11597248 · 2024-06-27 (June 27, 2024)
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.
Owner-reported narrative. Look up ODI 11597248 at NHTSA ↗
Owner report 11609112 · 2024-08-17 (August 17, 2024)
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 began no lights illuminated, until ~30 seconds in the yellow engine failur…
Owner-reported narrative. Look up ODI 11609112 at NHTSA ↗
Owner report 11616571 · 2024-09-26 (September 26, 2024)
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 jerked and the failure recurred. An unknown dealer was notified of the fa…
Owner-reported narrative. 30,590 miles reported. Look up ODI 11616571 at NHTSA ↗
Owner report 11619403 · 2024-10-11 (October 11, 2024)
For 4-5 weeks the car often would not start. Jump the battery and it would start. Run fine 1-2 days then require another jump. At end required jump nearly every time it was to be used. Presently at Mazda dealer. They confirm the problem. They cannot find the cause. Car has been there two weeks. Waiting for assistance from manufacturer. I researched this on the internet. Visited many Mazda forums an 'do it yourself" forums. This seems to be a common problem. NO where have I read about a satisfactory solution. In fact, it sounds like th…
Owner-reported narrative. Look up ODI 11619403 at NHTSA ↗
Owner report 11448498 · 2022-01-23 (January 23, 2022)
Multiple warning messages came on including "Pus button start malfunction. Have the vehicle inspected." "In-vehicle network malfunction. Have the vehicle inspected." "Auto light system malfunction. Turn on/off lights manually." "Power steering malfunction. Have the vehicle inspected." "Driver attention alert disabled." Vehicle would not start after this and had to be towed to a Mazda dealership.
Owner-reported narrative. Look up ODI 11448498 at NHTSA ↗
Owner report 11635826 · 2025-01-14 (January 14, 2025)
The contact owned 2021 Mazda CX-30. The contact stated while attempting to park the vehicle in the parking garage at her workplace, the contact reversed and then straightened the steering wheel; however, after shifting to drive and attempting to drive 6-10 feet forward into the parking space, the vehicle unintendedly accelerated and crashed into a pillar before coming to a stop. The contact stated that the engine had revved up, and the vehicle made an abnormally loud sound before the vehicle unintendedly accelerated. The contact stated that the…
Owner-reported narrative. 31,000 miles reported. Look up ODI 11635826 at NHTSA ↗