AI Damage2020 Mazda CX-30: common problems
Owners of the 2020 Mazda CX-30 filed 34 complaints with NHTSA, most often about service brakes and engine. The maker issued 667 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 34
- involving a crash
- 1
- Technical service bulletins (TSB)
- 667
What fails most often
- 1 Service brakes 21% of all complaints
- 2 Engine 18% of all complaints
- 3 Electrical system 15% of all complaints
- 4 Fuel/propulsion system 15% of all complaints
- 5 Powertrain 12% of all complaints
- 6 Structure 9% of all complaints
- 7 Exterior lighting 6% of all complaints
- 8 Forward collision avoidance 6% of all complaints
- Service brakes: 7 complaints (21% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 29.
- Engine: 6 complaints (18% of all); manufacturer bulletins for this component: 63.
- Electrical system: 5 complaints (15% of all); manufacturer bulletins for this component: 273.
- Fuel/propulsion system: 5 complaints (15% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 9.
- Powertrain: 4 complaints (12% of all); manufacturer bulletins for this component: 35.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 2.5 L · petrol · 4 cyl
- automatic, 6-speed
Drive: FWD, 4WD
Symptoms owners describe
How many of the 34 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Service brakes | 7 | 1 | 29 |
| Engine | 6 | 0 | 63 |
| Electrical system | 5 | 0 | 273 |
| Fuel/propulsion system | 5 | 1 | 9 |
| Powertrain | 4 | 0 | 35 |
| Structure | 3 | 0 | 55 |
| Exterior lighting | 2 | 1 | 32 |
| Forward collision avoidance | 2 | 0 | 18 |
| Suspension | 2 | 0 | 7 |
| Seat belts | 2 | 0 | 0 |
| Visibility | 1 | 0 | 25 |
| Wheels | 1 | 0 | 17 |
| Steering | 1 | 0 | 12 |
| Equipment | 0 | 0 | 236 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The front camera didn't operate properly The brakes have an elongated stopping distance
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.
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.
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.
My 2020 Mazda CX-30 has an intermittent no-start condition caused by a complete electrical failure. This occurs randomly, often overnight and after long or short trips.
There is a module that should connect to the hatch door to open. That module in no longer available. Without the hatch door opening, in case of side impact and being pushed into something else, there is no way to get out of the car. This poses a serious safety hazard.
The transmission was shifting with jerky motions. On july 14, 2025 I brought the car to palisades mazda in rockland county new york to have transmission looked at and to change transmission fluid changed. After I dropped the car off later that day I got a call that the transmission was condemned.
The initial sensor alarm indication was low oil pressure and within less then an hour engine malfunction was detected and the vehicle stopped functioning. This incident occurred on [XXX] in SanAntonio and thereafter it was towed to the Mazda Dealership for inspection upon request.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 6,426 of 36,659 model years in the NHTSA data (top 18% most complained about).
On average one model year of the CX-30 has 37 complaints (7 years in the data). This year has 34, about average.
What to check before buying
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Frequently Asked Questions (FAQ) Index General Questions MAZDA CONNECT Indication Setup and Getting…
Frequently Asked Questions (FAQ) Index General Questions MAZDA CONNECT Indication Setup and Getting Started Dealer Processes Registration / Enrollment / Take-Over Customer Subscription Status WI-FI General Informatio…
- If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...),…
If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been…
- Some customers may complain about any of the following
1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App
- Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair…
- Some customers may complain about any of the following
1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App Connected Vehicle enrollment. 2. Remote functions inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF…
- Infotainment Reboot With Navigation Card Installed This Service Information is no longer valid
Refer to the following updated Technical Service Bulletins: CX-5 / CX-9: 16-002/23 - UPDATED SOFTWARE RELEASE FOR CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM (7TH GEN TYPE) Mazda3 / CX-30 (Non-Turbo): 16-008/23…
- Some customers may complain about the infotainment system and/or the MyMazda App showing incorrect clock…
Some customers may complain about the infotainment system and/or the MyMazda App showing incorrect clock and/or tire pressures and/or tire pressure missing. This may be caused by: Incorrect calendar entry…
- Some customers may complain about SiriusXM Travel Link, Traffic Plus showing expired even though the…
Some customers may complain about SiriusXM Travel Link, Traffic Plus showing expired even though the customer purchased a paid subscription. SiriusXM audio packages do not include SiriusXM Travel Link, Traffic Plus. To…
- Some vehicles may exhibit accumulation of dried coolant (1) around the water pipe (2)
This is caused by a gap between the housing and pipe due to a press fitting during the manufacturing process. The accumulated coolant is solidified and plugs the gap in high temperature environment and the seepage is…
- The Blind Spot Monitoring (BSM) system can malfunction with the following symptoms if the rear side radar…
The Blind Spot Monitoring (BSM) system can malfunction with the following symptoms if the rear side radar sensors are installed facing the wrong direction.
- Some customers may complain that the seat warmer does not operate when turning the ignition on while the…
Some customers may complain that the seat warmer does not operate when turning the ignition on while the seat is warm but when turning the ignition off then on again, the seat warmer begins to operate appropriately…
- Some customers may complain that the electric power steering warning light illuminates after engine start…
Some customers may complain that the electric power steering warning light illuminates after engine start and DTC U2011:1C is stored. Zinc-plated whisker may form inside the EPS motor and trigger the DTC. However…
NHTSA lists 667 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 Mazda CX-30?
Owner complaints to NHTSA most often mention: service brakes, engine, electrical system. Total complaints: 34. The most frequent symptoms in complaint texts: warning lights, check engine (15%), jerking, harsh shifts (6%), won't start (6%).
How many service bulletins (TSB) were issued for the 2020 Mazda CX-30?
NHTSA lists 667 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 Mazda CX-30 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-06.