2020 Mazda CX-30 problems and complaints
Owners have filed 34 complaints with NHTSA about the 2020 Mazda CX-30. The most-reported areas: Unknown Or Other (9), Service Brakes (7), Engine (6).
Key takeaways
- 34 owner complaints on file with NHTSA.
- 1 involve a crash, 0 a fire, 0 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Unknown Or Other | 9 | 26% |
| Service Brakes | 7 | 21% |
| Engine | 6 | 18% |
| Electrical System | 5 | 15% |
| Fuel/Propulsion System | 5 | 15% |
| Power Train | 4 | 12% |
| Structure | 3 | 9% |
| Exterior Lighting | 2 | 6% |
| Seat Belts | 2 | 6% |
| Suspension | 2 | 6% |
| Forward Collision Avoidance | 2 | 6% |
| Visibility/Wiper | 1 | 3% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2020 Mazda CX-30 SUV AWD | 5/5 | 5/5 | 5/5 | 4/5 |
| 2020 Mazda CX-30 SUV FWD | 5/5 | 5/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Engine - filed 2026-10-06
Multiple fixes and repairs on a P0421 code. Repaired by Mazda with a new catalytic converter but then refused to replace it when the code came back saying it was not covered by the warranty. Mazda says it is not a common issue but they have had issues in the past with the same P0421 code repeatedly showing up on a heal...
Power Train - filed 2026-09-03
My car was squeaking and lurching around 3/4 gear. I took it in to the Mazda dealership (Northtowne Mazda in Kansas City) and they told me it was a "well-known issue" with this year and make of a Mazda. There is a problem with the torque converter lock-up clutch which sheds iron particles into the transmission fluid. T...
Exterior Lighting - filed 2026-07-18
The front passenger side headlight is making a whirring noise whenever the light is turned on. Based on the NHTSA safety reports for this model, this indicates the fan is failing, and soon the headlight will also fail. Intact headlights are essential for driving safety at night. No warning messages have appeared on the...
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More for the 2020 Mazda CX-30
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.