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Mazda
CX-9
TC·
2016-2026
suv-soft
Value
Price (AUD)
$25k-$60k
Body styles
5-door 7-seat wagon
Drivetrain
FWD, On-demand AWD (i-Activ, with rear power take-off unit)
Origin
Japan
Built in
Japan (Ujina #1 plant, Hiroshima)
Overview
The second-generation CX-9 (TC) launched in Australia in mid-2016 as Mazda's flagship seven-seat soft-roader, sold as Sport, Touring, GT, GT SP, Azami and the run-out Azami LE. Unlike the V6 TB it replaced, the TC is a single-engine line: every CX-9 TC sold here uses the 2.5L SkyActiv-G turbo four (PY-VPTS) paired exclusively with a six-speed automatic, in front-drive or i-Activ on-demand AWD. It's a genuinely good-driving, premium-feeling large SUV with strong real-world torque, but it is not a serious off-roader and tows a modest 2000kg braked. The defining reliability concerns are the AWD models' sealed rear power take-off / transfer unit (the 'lifetime' fluid degrades and the unit can seize), a smaller number of cracked-cylinder-head/coolant-loss cases on 2016-2020 cars, plus the usual direct-injection turbo housekeeping (intake carbon, oil dilution from short trips) and Mazda niggles like cracking infotainment screens and failing power-fold mirrors. Well-serviced examples with the PTU fluid changed are reliable and pleasant; buy on service history.
Engines & variants
2.5L SkyActiv-G 2.5T turbo petrol
Engine
2.5L SkyActiv-G direct-injection turbo-petrol I4 with Dynamic Pressure Turbo and cooled EGR
Config
I4 turbo
Displacement
2488cc
Power
170kW @ 5000rpm (on 95/98 premium; ~169kW on 91)
Torque
420Nm @ 2000rpm
Drivetrain
FWD or i-Activ on-demand AWD
Economy
8.4-9.0 L/100km combined (claimed); 9-11 L/100km real world
Tow (braked)
2000kg
Tow (unbraked)
750kg
Transmission
6AT
Timing chain / belt / gear
Chain-driven
Pros
- Strong, flexible low-down torque (420Nm from 2000rpm) - feels like a bigger engine
- Shares its bottom end with the proven naturally-aspirated SkyActiv 2.5
- Chain-driven timing, no belt to replace
- Smooth, quiet and economical for a large 7-seat SUV
- Premium cabin and good resale within the segment
Cons
- AWD models carry the rear PTU/transfer unit with 'lifetime' fluid that can fail
- Direct injection means intake-valve carbon and oil-dilution risk on short trips
- Only a 6-speed auto and modest 2000kg tow rating
- Likes premium fuel to make full power
- A handful of cracked-head/coolant-loss cases on 2016-2020 build
Known problems
high
Rear PTU / transfer unit failure (AWD)
AWD CX-9s use a rear power take-off / transfer unit filled with 'lifetime' fluid that Mazda never gave a change interval. The fluid degrades, overheats and breaks down; bearings can pick up and the unit can seize. If it lets go it can damage the output splines and cost far more. A recurring complaint on Australian owner forums and CarsGuide.
Fix: Change the PTU/transfer-case fluid every 40,000-60,000km as preventive maintenance (most independents now recommend this). Inspect for whine/heat pre-purchase on AWD cars; FWD cars are not affected.
high
Cracked cylinder head / coolant loss (2016-2020)
A minority of 2016-2020 engines have cracked cylinder heads (and occasionally blocks), showing as coolant loss, coolant spraying/seeping from the rear of the engine, overheating or misfire. Failure rate is low relative to volume sold but the repair is major.
Fix: Pressure-test the cooling system and check for coolant loss/oil-coolant mixing pre-purchase; head replacement or short/long engine if cracked. Confirm any goodwill/warranty history.
medium
Intake-valve carbon build-up (direct injection)
Like all direct-injection engines, fuel doesn't wash the back of the intake valves, so carbon accumulates and can cause rough idle, hesitation and a slight power/economy drop. The cooled-EGR system can add intake soot.
Fix: Walnut-blast / chemical intake clean as needed; quality oil, longer drives and an occasional spirited run help. A catch-can reduces build-up.
medium
Oil dilution / oil consumption on short trips
Stop-start, short-trip city use can let fuel dilute the oil and, on some cars, raise oil consumption (valve-stem seals implicated on a few later engines). Worth watching, not a widespread defect.
Fix: Stick to 10,000km/12-month oil changes (sooner for short-trip use), check oil level regularly, and ensure the engine reaches full temperature.
Common problems (all variants)
medium
Cracking / spider-web infotainment screen
The dash-top centre display can develop internal cracks or a spider-web pattern without impact, a well-documented CX-9 TC complaint, often blamed on heat and adhesive ageing.
Fix: Screen/unit replacement; some cars done under warranty - check the display carefully pre-purchase.
low
Power-folding mirror failure
Power-folding door mirrors commonly stop folding in or out, or fold erratically - one of the most frequent owner exterior complaints.
Fix: Mirror fold-motor/actuator or full mirror replacement; many resolved under warranty when in period.
medium
Brake booster / master cylinder
Some owners report brake booster / brake master cylinder failure (subject to a US recall but not an AU recall), giving a hard or inconsistent pedal.
Fix: Booster/master-cylinder replacement; check pedal feel and for warning lights pre-purchase.
low
Sunroof glass shatter (panoramic)
Panoramic sunroof glass has reportedly shattered during normal driving on some cars due to heat, stress or debris.
Fix: Glass replacement; some addressed under warranty after Mazda Australia review.
low
Soft paint / scratch-prone gloss black trim
Soul Red and other finishes are reported as soft/easy to scratch, and the gloss-black interior and exterior trim marks easily.
Fix: Cosmetic only - paint correction/protection; not a mechanical fault.
low
Brake wear on a heavy 7-seater
A heavy seven-seat SUV works its brakes hard, especially loaded or in stop-start traffic, so pads and rotors wear faster than a smaller car.
Fix: Quality pads/rotors; budget brakes as a regular consumable.