This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA-017/25 12/16/25, 09/08/25, 07/14/25, 05/15/25 and 03/21/25 DESCRIPTION Mazda Connect 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 Opening the TCU Communication Line WI-FI How-To Conditions for Remote Engine Start Will Not Function WI-FI Trial Period Conditions for Remote Engine Start Function Will turn engine OFF Interacting With The App TCU Communication Line Status Service Issues Educational Videos Troubleshooting
full bulletin at NHTSA ↗2021 Mazda CX-30 engine problems
moderate Owners of the 2021 Mazda CX-30 have filed 37 NHTSA complaints about the engine at roughly $3,100 to repair (U.S. federal records, as of August 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Complaints
37
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2021 CX-30 (this page) | 37 |
| 2022 CX-30 | 6 |
When does it fail?
Of the 37 engine complaints filed for the 2021 Mazda CX-30, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Engine accounts for 37% of every owner complaint on file for this vehicle — the dominant problem area across 7 categories tracked.
Owners have filed 37 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION 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 installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices. Examples: 1. Devices connected to the DLC-2 (battery discharge/DTC stored) 2. Devices plugged into the 12V outlet 3. GPS tracking device (engine no start/battery discharge) 4. Dash cam (DTC stored)
full bulletin at NHTSA ↗This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 09-012/21 12/13/21, 06/10/21 and 04/27/21 DESCRIPTION Some customers may experience all of following symptoms: The door lock/unlock operation will not work using the remote transmitter button. 1. The door lock/unlock operation will not work using the door lock/release touch sensor. 2. The engine will not start using the ignition switch. 3. The transmitter operates by itself. 4. The key battery drains faster than usual. 5. Symptoms 1-3: This may be caused when excess load is applied to the remote transmitter, deforming the electrical terminals and creating poor contact with the battery. To e
full bulletin at NHTSA ↗Valve Stem Seals Class Action Settlement Program for Excessive Oil Consumption and Oil Consumption Powertrain Warranty Extension Special Service Program SSPD5. Updated April 28, 2026 – Related oil part number for warranty claims is now 0000-77-5W30-QT (engine oil) as the 5555 warranty part number has been removed. As a reminder, all coverage reverts back to the original extension of 7 years or 84,000 miles whichever comes first. WARRANTY EXTENSION If you have any questions regarding this campaign, please read the Mazda Dealer FAQ’s available in MGSS under this campaign before contacting Dealer Recall Help. Effective October 25,2025: In the final settlement agreement, which was approved by th
full bulletin at NHTSA ↗This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all major vehicle systems. Mazda recommends dealers follow the scheduled maintenance tables as cited in the vehicle-specific workshop manual or owner's manual. Services performed outside of Mazda's factory scheduled maintenance are not recommended. These services are unnecessary and create unneeded expenses for your customers. SCHEDULED MAINTENANCE Refer to the applicable Workshop Manual or Owner's Manual for vehicle -specific manufacturer scheduled maintenance.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2021 Mazda CX-30, particularly with the 2.5-liter turbocharged engine, has a widespread excessive oil consumption issue that Mazda itself has documented in technical service bulletins TSB 01-003/23 and TSB 01-012-21. Owners report their engines burn approximately 1 quart of oil every 3,000–6,000 miles, sometimes faster, forcing them to top off oil between scheduled service intervals as early as 3,000–8,000 miles from purchase. Multiple owners report adding 6–7+ quarts over 25,000–29,000 miles of ownership. No external oil leaks are detected; the oil is being burned in the combustion chamber. Mazda's TSB attributes the issue to damaged valve seals on the exhaust side, predominantly in engines built before September 2021.
Owners also report blue smoke from the exhaust on cold start, a telltale sign of valve seal wear. Some dealerships have mentioned a future valve seal replacement as a potential fix, but the part is not yet available and certified technicians to perform the work are scarce. Current dealer protocol is to monitor the vehicle and add oil as needed. Mazda has issued no recall and provided no other repair solution. One owner additionally reported a battery failure at 23 months, and another encountered severe power loss and multiple warning lights requiring repeated PCM and sensor replacements—though whether these are related to the oil issue remains unclear.
Failure modes owners describe
Excessive Engine Oil Consumption
The 2021 Mazda CX-30 with turbocharged 2.5L engine burns oil at rates significantly higher than normal, typically requiring oil top-ups every 3,000–6,000 miles despite no external leaks being detected. Mazda issued TSB 01-003/23 and TSB 01-012-21 documenting this issue; the bulletin attributes it to valve seal damage on the exhaust side, particularly in engines built before September 2021.
When: Typically between 3,000–8,000 miles; earliest report at 2,100 miles; owners report needing 6–7+ oil changes within 25,000–29,000 miles of ownership
Symptoms owners cite: Low engine oil warning light illuminates between service intervals; Oil level drops approximately 1 quart every 3,000–6,000 miles; Blue smoke visible from exhaust on cold start; No external oil leaks detected upon inspection; Oil is being burned in the combustion chamber rather than leaking externally
Codes mentioned: P250f:00 (DTC associated with low engine oil level per TSB)
Repairs/costs cited: Mazda has no confirmed permanent repair. TSB 01-003/23 references a valve seal replacement as a future fix, but dealers lack technicians certified to perform it, and the part is not yet available. Current dealer response: monitor the vehicle and top off oil as needed; some dealers replace the valve stem cap as a temporary measure.
Recalls/TSBs owners mention: TSB 01-003/23 acknowledges the issue and states that valve seals will require replacement once available, but Mazda currently has no fix. TSB 01-012-21 issued October 2021 for 2021 turbocharged models built prior to September 2021. No recall has been issued. Owners report Mazda customer relations provides no assistance and simply advises adding oil when necessary.
Recurring Low Oil Warning Light Without Confirmed Low Oil
Some owners report the low engine oil warning light illuminating repeatedly even though the dipstick reading appears normal or only slightly low. This creates confusion about whether oil is actually depleted or if the sensor/system is malfunctioning.
When: Reported at various mileages between 3,605 and 15,500 miles
Symptoms owners cite: Low engine oil warning light illuminates on dashboard and mobile app alerts; Dipstick check shows oil level at or near appropriate range; Warnings recur periodically without corresponding oil loss visible on dipstick; Dealer unable to confirm low oil when vehicle is brought in
Codes mentioned: P250f:00
Repairs/costs cited: No repair performed. Dealers have not identified a sensor malfunction or calibration issue.
Power Loss and Multiple Warning Lights (Possible Software/Electrical Issue)
One owner reported severe power loss (vehicle decelerated to 20 MPH) with multiple unknown warning lights at 36,500 miles. The vehicle was diagnosed sequentially with a failed MAP sensor, battery failure, and eventually a PCM requiring software update. Despite multiple interventions (battery replacement, MAP sensor replacement, PCM replacement, software update), the failure recurred repeatedly over a 53-day dealer visit span.
When: 36,500 miles
Symptoms owners cite: Multiple unknown warning lights illuminated on instrument panel; Vehicle decelerated to 20 MPH with loss of power; Failure was intermittent and not reproducible on first inspection; Codes could be reset but failure recurred
Repairs/costs cited: Battery replaced, MAP sensor replaced, PCM replaced, and software update performed over 53 days (19 days initial, then 34 additional days). Issue recurred despite all repairs.
Recalls/TSBs owners mention: Manufacturer was made aware but provided no additional assistance.
Battery Failure
One owner reported that the vehicle's battery failed at 23 months after purchase on a brand-new vehicle, attributed to a faulty charging system. This occurred concurrent with low oil warning issues.
When: 23 months after purchase (2021 model, so approximately 2023)
Symptoms owners cite: Vehicle failed to start or start after multiple attempts; Battery drained prematurely
Repairs/costs cited: Battery was replaced.
Synthesized from 37 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
Low engine oil light displayed at 7,030 miles. No leaks detected. Engine consuming oil burning in combustion chamber. Possible engine damage or failure if oil was not quickly refilled.
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.
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 Low Oil Level light/sensor came on before it was time to get an oil change (the recommended 4600 miles). This is super dangerous as it can cause major engine issues. I took it to the dealership and the dealership stated "they are having problems with these cars-they are burning too much oil so there is going to be a replacement valve once they have one made and you'll need to come back in to…
Low Engine Oil displayed on dashboard after only a couple thousand miles/four months from last oil change service. Known issue with this year/model for a year (https://static.nhtsa.gov/odi/tsbs/2021/MC-10203724-0001.pdf), but no recall or fix has been offered other than topping off or changing the oil. The dealer did top off the oil for free as the notice says.
Had engine trouble with your 2021 Mazda CX-30?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2021 Mazda CX-30?
It's a documented issue but not catastrophic. 37 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Based on the 37 complaints filed, engine issues most often appear around 13,900 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2021/Mazda/CX-30.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.