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 ↗2019 Mazda CX-9 engine problems
moderate Owners of the 2019 Mazda CX-9 have filed 15 NHTSA complaints about the engine at roughly $3,100 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Complaints
15
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2015 CX-9 | 12 |
| 2016 CX-9 | 49 |
| 2017 CX-9 | 34 |
| 2018 CX-9 | 62 |
| 2019 CX-9 (this page) | 15 |
| 2020 CX-9 | 3 |
| 2021 CX-9 | 18 |
When does it fail?
Of the 15 engine complaints filed for the 2019 Mazda CX-9, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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 29% of all owner complaints filed against this vehicle, across 5 categories tracked.
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 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 ↗This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/19 DESCRIPTION If an engine assembly is replaced after a catastrophic internal mechanical failure, clean the intake manifold internally before installing a replacement engine assembly. If the intake manifold is not cleaned properly, the replacement engine may fail prematurely. Metallic debris from the old engine (with catastrophic internal mechanical failure) may rest inside the intake manifold. When the new engine assembly is installed, debris in the intake manifold will be ingested into the new engine and cause internal damage. Clean the intake manifold
full bulletin at NHTSA ↗This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red. SA-035/24 05/31/24 DESCRIPTION There is a concern that some water pumps are being replaced that are not faulty, due to signs of a very small coolant leak from the bleed hole. This Service Alert is to inform you about the water pump sealing mechanism and the criteria if replacement is necessary or not. A mechanical seal (A) is used for the water pump. This mechanical seal can seal coolant (B) by sliding a mating ring (C) against a seal ring (D). When the sliding surface temperature of the mechanical seal is more than 248 °F (120 °C) while driving, a small amount of steam (E) is lea
full bulletin at NHTSA ↗Some customer's might state that they notice fluid or oil leaking/dripping on the ground when the vehicle is parked. For this concern, inspect the vehicle for any trace of a fluid or oil leak and use the following examples as a guide to determine if it is severe enough to require a repair, or just to clean the area and monitor it at the next service. Examples of residue or seepage that may not be considered a leak and that may not require repair based on splash shield inspection.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2019 Mazda CX-9 vehicles are reporting coolant leaks originating from cracked cylinder heads, documented in Mazda's own Technical Service Bulletin 01-013/21 (issued October 2021). Coolant seeps from the cylinder head, pools beneath the engine, and drips onto the oil filter and exhaust manifold, where it burns off. This failure has struck vehicles across a broad mileage spectrum—from 25,000 to over 100,000 miles—with some owners noticing symptoms only during cold-weather operation, others experiencing sudden catastrophic overheating without prior warning.
The overheating events are particularly dangerous: several owners report the engine entering limp mode on highways during traffic, with no warning light or message before the power loss occurred. One vehicle overheated and began smoking after just 2 miles of driving. Diagnostic scans reveal coolant temperatures as high as 251.6°F, and borescope inspection has shown coolant actively entering cylinders and being burned off inside the engine.
Dealers have uniformly quoted $12,000 to $14,000 for complete engine replacement, though cylinder head replacement alone costs $5,000–$6,000. Mazda issued a powertrain warranty extension (TSB 01-002/23) in February 2023, but owners report that dealerships are routinely denying claims under this extension, citing alternative diagnoses or out-of-warranty status. Multiple owners reference ongoing class action lawsuits against Mazda.
Same Mazda CX-9 engine reports on nearby years: 2016 · 2017 · 2018 · 2021
Failure modes owners describe
Coolant leaks from cracked cylinder heads
Coolant escapes through cracks in the cylinder head, typically at the back of the engine near the turbo. Coolant drips onto the oil filter, exhaust manifold, and into engine oil, where it burns off. This is covered in Mazda TSB 01-013/21 (issued 10/15/21) for 2016-2020 CX-9 SKYACTIV-G 2.5T vehicles with VINs produced before June 9, 2020.
When: Occurs across a wide mileage range: 25,000 to 100,000+ miles; some owners report first symptoms as early as low-mileage use or after cold weather operation
Symptoms owners cite: Low coolant level requiring frequent refills; Coolant warning light on dashboard (may blink or stay solid); Blue/greenish fluid pooling under vehicle; Heater not working properly; Coolant leaking onto exhaust (burning smell, potential fire hazard)
Codes mentioned: P111A (engine coolant temperature reached 251.6°F, forcing limp mode)
Repairs/costs cited: Dealers typically quote $5,000–$6,000 to replace cylinder head; complete engine replacement quoted at $12,000–$14,000. Extended powertrain warranty (TSB 01-002/23, issued Feb. 10, 2023) is referenced by owners but dealers often deny coverage, citing various reasons or alternative diagnoses (e.g., water pump failure, EGR valve). At least one owner reports putting a third engine in the vehicle due to repeated failures across multiple motors.
Recalls/TSBs owners mention: Mazda TSB 01-013/21 (Coolant Leaks at Cylinder Heads); Mazda TSB 01-002/23 (Powertrain Warranty Extension); Mazda has issued warranty extensions but owners report dealers are not honoring them. Mazda denies claims citing out-of-warranty status or alternative diagnoses. Multiple owners reference ongoing class action lawsuits.
Engine overheating with limp mode activation
Engine coolant temperature spikes to dangerous levels (251.6°F and higher), triggering automatic limp mode to reduce engine power. This occurs with little to no warning, creating a safety hazard when it happens in highway traffic. Overheating can cause internal engine damage, including head warping and coolant intrusion into cylinders.
When: Can occur suddenly during normal driving; some instances noted after extended periods parked (e.g., overnight); one owner reported overheating within 2 miles of driving after 8 hours parked
Symptoms owners cite: Engine power suddenly reduced without warning; Dashboard message 'High Engine Temperature/Engine Output may be limited'; No prior coolant warning or low-coolant indicator; Smoke from engine compartment; Vehicle in limp mode, unable to accelerate normally
Codes mentioned: P111A (engine coolant reached 251.6°F, forcing limp mode)
Repairs/costs cited: Digital borescope inspection revealed coolant entering and being burned off in cylinders. One technician found no external coolant leaks but evidence of internal coolant breach. Technician assessment suggests engine block may have internal damage beyond what a head replacement would address.
Recalls/TSBs owners mention: No TSB specifically addressing limp mode activation; covered under general TSB 01-013/21 for coolant leaks. Dealers recommend full engine replacement rather than repair.
Water pump cracking and secondary coolant system failure
Water pump develops cracks, allowing coolant to leak from the cooling system. This is sometimes diagnosed in conjunction with cylinder head cracks, complicating the root cause. One owner's dealership attributed the failure to a cracked water pump alongside a cracked cylinder.
When: Reported at 63,000 miles and as late as overheating within 2 miles of parked periods
Symptoms owners cite: Coolant warning light on dashboard; Low coolant level; Loud, rattling noise from engine as it warms up; Overheating and smoke after brief driving; Blue/greenish coolant leaks
Repairs/costs cited: One dealer quoted $2,000 to rebuild turbo as secondary consequence of water pump failure. Typically addressed as part of full engine replacement.
Engine won't start after warning light; extended repair delay
Engine warning light illuminates; vehicle subsequently fails to start and requires towing. New engine is required but is on back order for months, leaving owner without a vehicle while making payments.
When: At 41,000 miles
Symptoms owners cite: Engine warning light comes on; Vehicle will not start after warning light appearance
Repairs/costs cited: New engine on back order for months. Issue is covered under powertrain warranty, but extended repair timeline leaves owner stranded.
Recalls/TSBs owners mention: Covered under powertrain warranty; however, warranty does not reduce downtime during parts availability.
Synthesized from 15 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
The car has only 41k miles on it and the engine warning light came on. I had the car towed to Mazda and now it won’t start and it needs a new engine. (Which is on back order for months). It is covered under the powertrain warranty but does me no good if I’m without a vehicle, and making car payments on a vehicle that isn’t running.
1. What component or system failed or malfunctioned, and is it available for inspection upon request? ANSWER: Engine failure due to overheating. 2. safety & indicators: ANSWER: During evening rush hour traffic on a 3 lane highway my car went into a form of engine power saving mode while i had children in the vehicle; this was almost catastrophic form my family and the other vehicles around me.…
The engine is leaking coolant i will be putting a 3rd motor in this car due to other 2 motor also have a coolant leaking and running hot i have contact mazda and would not stand behind there car
The contact owns a 2019 Mazda CX-9. The contact stated while driving 15 mph, she heard an abnormal noise. The contact stated no warning light was illuminated. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had been informed of the failure. The failure mileage was approximately 25,000.
Had engine trouble with your 2019 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 2019 Mazda CX-9?
It's a documented issue but not catastrophic. 15 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 15 complaints filed, engine issues most often appear around 25,000 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/2019/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.