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Engine coolingPart report

2010 Mazda CX-9 Engine cooling Problems

Complaints
5about this part
Share
3%of 195 total for the year
Median mileage
74,711miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 5 complaints about the engine cooling of the 2010 Mazda CX-9, 3% of the 195 complaints for this model year. Where a mileage was given, the median is 74,711 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“There is a ticking noise in the engine when idle. When the engine is cold the noise is louder. The vehicle has been taken to the dealer. The dealer states that there is nothing to fix. The dealer is informing me that it was the characteristics of the vehicle and it was inspected by a Mazda engineer. The engineer claims that this is a normal sound for this vehicle and engine. I explained that I had not heard this on any of the other CX-9's I drove. The dealer tried to claim it was due to different engines. I informed the dealer that they all had the same engine. …”

NHTSA complaint #10384882, filed 2011-02, 22,000 miles

“The first time I experienced this terrifying ordeal was in november of 2011. Since then, I have had it happen two more times. The car accelerates of up to speeds of 90 MPH without warning . All 3 incidents have happened on the highway. The brakes slow it down, but do not stop it. All 3 times, I've been lucky enough to get the car to the shoulder and ride down the median , pushing the emergency break in and at one point pushing it into park. Mazda knows about this. Therefore they are liable. …”

NHTSA complaint #10452780, filed 2012-03

“The contact owns a 2010 Mazda CX-9. The contact stated while conducting a routine check, he noticed that the coolant and the oil levels were low. An independent mechanic diagnosed that the coolant was leaking into the engine. The vehicle was not repaired. An unknown dealer was contacted and informed the contact that the VIN was not included in a recall related to the failure. The manufacturer was not notified of the failure. The failure mileage was 160,000.”

NHTSA complaint #11499001, filed 2022-12, 160,000 miles

“The contact owns a 2010 Mazda CX-9. The contact stated that there was a loud ticking noise in the engine. Once the engine was cold the noise became extremely loud but when it was warm the noise ceased. The vehicle was taken to the dealer twice. The first time they stated that they corrected the problem by down loading information from the computer in reference to the PCM and told her that it was corrected. When she drove the vehicle it continued to make noise. She then returned the vehicle back to the dealer and they were diagnosing the failure for an entire week. …”

NHTSA complaint #10356724, filed 2010-09, 1,500 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
201822%
201633%
201513%
201412%
201210%
201053%
200912%
200811%
200711%

Other parts of the 2010 Mazda CX-9

Brakes
91 complaintsEngine
23 complaintsTransmission and drivetrain
23 complaintsAir bags
18 complaintsSuspension
16 complaintsVehicle speed control
9 complaintsOther or unknown
7 complaintsElectrical system
6 complaintsBody and structure
6 complaintsExterior lighting
4 complaintsSteering
4 complaintsWheels
4 complaints

← All problems reported for the 2010 Mazda CX-9

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology