Water pump caused antifreeze to mix with motor oil causing the engine to have to be replace on three occasions within 6 months
2013 Mazda CX-9 engine problems
moderate 13 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
13
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 13 engine complaints filed for the 2013 Mazda CX-9, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 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 19% of all owner complaints filed against this vehicle, across 6 categories tracked.
No new NHTSA engine complaint has been filed on this vehicle in over 6 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2013 CX-9's integrated internal water pump is prone to failure, allowing coolant to contaminate engine oil and trigger catastrophic engine damage with little warning. Expect a full engine replacement ($4,000–$10,000) as the only repair option, with no factory recall in place.
The dominant complaint across these 13 complaints is internal water pump failure on 2013 CX-9s. Owners describe a pattern where the water pump cracks or leaks, sending coolant into the engine oil where it forms a sludge that wipes out lubrication and locks up the engine. This failure is catastrophic: the car stalls without warning, sometimes at highway speeds or in traffic, leaving owners stranded with a vehicle that won't run.
The problem shows up across a wide mileage range—from 57,000 to 214,000 miles—and can happen within five years of ownership. Symptoms typically include a check engine light, loss of cabin heat, overheating on the gauge, metal clanking from the engine, rough idle, or sudden loss of power steering and brakes as the engine dies. Owners report taking vehicles to both independent shops and Mazda dealers, only to be told the engine needs complete replacement. Because Mazda integrated the water pump into the engine assembly, you cannot replace the pump alone—dealers quote $4,000 to $10,000 for a new engine. No recall has been issued. One owner even reported needing three engine replacements within six months. Owners consistently note this design flaw should trigger a recall for public safety.
A secondary issue involves timing chain failure when coolant contaminates the oil, though this typically stems from the same root cause. One complaint mentions a throttle valve body problem at 57k miles, an unrelated malfunction.
Same Mazda CX-9 engine reports on nearby years: 2010 · 2012 · 2014 · 2015 · 2016
Failure modes owners describe
Internal water pump failure with coolant-to-oil contamination
The internal water pump fails, allowing coolant to leak into the engine oil, creating a sludge that destroys lubrication and causes immediate engine seizure or severe damage. Owners report this happens with little to no warning.
When: Failures reported across a wide mileage range: 57k, 74.5k, 160k, and 214k miles; some occur within 5-6 years of ownership
Symptoms owners cite: Check engine light illumination; Loss of engine heat/no heat from vents; Engine overheating on temperature gauge; Metal clanking or rattling noise from engine; Engine stalling without warning; Loss of power steering and power brakes due to engine shutdown; Rough idle; Extended cranking/difficulty starting; Engine shuddering or shaking; Complete loss of engine power
Codes mentioned: P0016, Code related to crankshaft/camshaft correlation
Repairs/costs cited: Full engine replacement required in most cases, as the water pump is integrated into the engine assembly and cannot be serviced separately. Owners cite replacement costs between $4,000–$10,000. One owner reports engine replacement on three occasions within 6 months.
Recalls/TSBs owners mention: No manufacturer recall issued. Mazda dealers have confirmed the water pump design flaw and approved engine replacement as the only repair solution. One case mentions manufacturer was informed and case was filed; vehicle ultimately required throttle valve body replacement.
Timing chain failure secondary to coolant contamination
Coolant entering the oil corrodes the timing chain and disrupts valve timing synchronization. Owners and mechanics identify this as a consequence of the water pump failure, causing the engine to become undrivable.
When: Occurs after water pump failure allows coolant to mix with oil; noted at 74.5k and 160k miles
Symptoms owners cite: Timing jumping or misalignment; Engine rattle under light acceleration; Rattle upon startup; Extended cranking; Engine freeze risk (as reported by technician)
Codes mentioned: P0016
Repairs/costs cited: Water pump and timing chain replacement quoted; however, due to integrated design, engine replacement is the practical repair path.
Throttle valve body malfunction
Vehicle becomes difficult to stop or accelerate responsively when throttle valve body fails. This is a separate failure mode from the water pump issue but reported in this complaint cluster.
When: At approximately 57,022 miles
Symptoms owners cite: Vehicle accelerator unresponsive or difficult to modulate; Difficulty stopping the vehicle
Repairs/costs cited: Throttle valve body replacement. The complaint notes the vehicle was repaired after being towed to Sandy Sansing Mazda.
Recalls/TSBs owners mention: Manufacturer informed; case filed. Vehicle was ultimately repaired.
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The vehicle was being driven at the time on a busy city street. We noticed some noises which was sounding like metal clanking. This became louder immediately in the span of 5mins and the temperature sensor went off on the dashboard. The vehicle was becoming unresponsive to brakes in the middle of commute traffic. Luckily we got the vehicle stopped on the side of the shoulder without any injuries…
Had engine trouble with your 2013 Mazda CX-9?
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 2013 Mazda CX-9?
It's a documented issue but not catastrophic. 13 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 13 complaints filed, engine issues most often appear around 91,795 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/2013/Mazda/CX-9.
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.