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 ↗2016 Mazda CX-5 engine problems
severe Owners of the 2016 Mazda CX-5 have filed 21 NHTSA complaints about the engine, typically surfacing around 50,000 miles 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 →
Failure mileage
Complaints
21
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2013 CX-5 | 10 |
| 2014 CX-5 | 12 |
| 2015 CX-5 | 7 |
| 2016 CX-5 (this page) | 21 |
| 2017 CX-5 | 9 |
| 2018 CX-5 | 85 |
| 2019 CX-5 | 100 |
| 2020 CX-5 | 12 |
1crash
1fire
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 ↗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 ↗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.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of the 2016 CX-5 are reporting multiple engine failure modes. Cylinder head cracks appear suddenly, sometimes signaled only by loss of cabin heat before catastrophic damage—antifreeze mixing into the oil—and requiring engine replacement ($7,300–$10,300). Excessive oil consumption around 70K miles happens without dashboard warning, leaving owners to discover oil 3 quarts low during manual checks; repair attempts (PCV valve, gasket replacement) have not stopped recurrence.
Drive belt tensioners leak and fail prematurely at 50K–67K miles—well before Mazda's stated inspection intervals—and dealers treat them as wear items ($400 repair) despite manual language suggesting inspection only. If a tensioner fails completely, the belt slips, the alternator and water pump stop, and the engine shuts down.
Several owners report complete engine seizure while driving, with internal damage (fractured rods, block cracks) found only after towing. One owner experienced engine fire on the highway. Unintended acceleration events—engine revving hard during braking or parking maneuvers—occurred in at least two instances. One owner discovered the transmission could remain in Drive after engine shutdown, allowing the car to roll. Fuel pump failure at 30K miles was also reported, though that issue falls outside current recall scope for this model.
Same Mazda CX-5 engine reports on nearby years: 2013 · 2014 · 2018 · 2019
Failure modes owners describe
Cylinder head crack with coolant-oil mixing
Cylinder head develops non-repairable cracks, allowing coolant to mix with engine oil (milky substance appearance). Owners report sudden loss of cabin heat as first symptom, with no prior warning lights or overheating. Catastrophic failure requiring complete engine replacement.
When: Varies; one case at 62K miles, others with no mileage stated
Symptoms owners cite: No heat from heater vents; Milky substance in oil indicating coolant-oil mixing; Check engine light (P011A, P111A-00 codes); Coolant temperature warning message on instrument panel
Codes mentioned: P011A, P111A-00
Repairs/costs cited: One owner cited $10,300 engine replacement estimate. Another owner cited $7,300 estimate to remove cylinder head and address crack. One case involved software update ($330) and thermostat replacement ($397.55) that did not prevent engine failure discovery.
Recalls/TSBs owners mention: Mazda Technical Service Bulletin 07-007/19 referenced as known issue in narrative #2. Partial goodwill assistance (~$775–$875) offered in one case with partial responsibility assigned to customer. Manufacturer case number 1-1844061638 assigned in one case but vehicle not repaired.
Excessive oil consumption without warning
Engine consumes or loses oil rapidly—typically 3 quarts—with no dashboard warning light to alert the driver. Occurs around 70K miles. Without owner intervention to check oil manually, condition could lead to engine seizure and malfunction while driving. Repair attempts include PCV valve and intake manifold gasket replacement but problem recurs.
When: Around 70K miles
Symptoms owners cite: Oil level 3 quarts low with no warning indicator; No check engine light illumination; Engine spraying oil internally
Repairs/costs cited: Independent shop (Coffmans Service Center, Warminster, PA) performed combustion chamber cleaning, iridium spark plug replacement, intake manifold gasket and PCV valve replacement, and oil/filter service. Problem persists despite repairs.
Recalls/TSBs owners mention: Manufacturer dismissed case when contacted. Owner noted class action lawsuit exists against Mazda but does not include 2016 model (lawsuit covers later years). Owner mentions 450+ complaints filed on NHTSA website for 2016 CX-5 oil consumption.
Drive belt tensioner leakage and premature failure
Hydraulic belt tensioner leaks and fails prematurely at 50K–67K miles, well before typical wear-out point. Mazda dealers claim it is a wear item and deny warranty coverage. Owner manuals state inspection only, not replacement. If tensioner fails completely, serpentine belt will slip or break, stopping alternator charging, water pump, and potentially causing catastrophic engine overheating and shutdown while driving.
When: 50K–67K miles; one owner had OEM replacement fail again within 1 year at 67K miles
Symptoms owners cite: Belt squeaking noises; Visible leakage/residue from tensioner; Knocking sounds from engine
Repairs/costs cited: Dealers quoted $400 for replacement. Multiple narratives describe this as design defect with many failures reported around 30K–50K mile mark.
Recalls/TSBs owners mention: Mazda refuses recall. Warranty coverage denied on out-of-warranty claims. One owner notes this is well-known problem with multiple vehicles failing at similar mileages but no recall issued.
Catastrophic engine failure (seizure/rod fracture/block damage)
Engine seizes, stops mid-drive, or fails without warning at varying mileages. Inspection reveals internal damage including fractured engine rods, block cracks, or total internal failure. In one case, engine block failure caused popping noise, black smoke, and engine fire. Occurs even with regular maintenance and oil changes.
When: 50K–70K miles; one owner reported ~62K miles with engine fire; another seized without warning at unknown mileage
Symptoms owners cite: Engine dies or seizes while driving; Popping noises from engine; Black smoke from engine compartment; All dashboard warning lights illuminate; Engine fire (one case); Engine will not restart or turn over; Engine sounds like helicopter when started (metallic noise); Loss of power while accelerating
Repairs/costs cited: All cases required or were quoted for complete engine replacement. One owner cited engine block failure with fractured rod as cause. Another owner reported being out of oil when serviced and engine subsequently seized. Estimates ranged from $7,300 to $10,300+ for replacement.
Recalls/TSBs owners mention: Manufacturer case number 1-1844061638 assigned in one case. Vehicle was not repaired due to cost. One owner suspects this is part of broader Mazda engine defect affecting multiple model years, referencing existing class action lawsuit against Mazda.
Unintended engine acceleration/uncontrolled revving
Engine revs violently and independently without driver input, particularly when braking or attempting to shift to park. No consistent warning before occurrence. In one case, vehicle lurched forward in parking lot hard enough to strike adjacent vehicles while already in park and foot on brake. Dealer identified defective air box in one case, but repair did not prevent recurrence.
When: Varies; one case at ~50K miles; another during routine parking maneuver
Symptoms owners cite: Engine revving without depressing accelerator; Vehicle lurching forward unexpectedly; Violent revving when brake pedal depressed; Revving during shift to park
Repairs/costs cited: One dealer identified and replaced defective air box; however, failure recurred post-repair. No other repairs documented in narratives.
Recalls/TSBs owners mention: Manufacturer not notified in at least one case. No recall or TSB mentioned.
Coolant system failure after authorized service
Immediately following 60K-mile service with coolant drain and refill at authorized Mazda dealership, check engine light illuminates. Dealer attributes failure to heater core clogging caused by coolant contamination or corrosion introduced during service procedure. Same issue occurred on another CX-5 at same dealership, suggesting systemic service procedure or coolant-compatibility defect.
When: Immediately after authorized 60K-mile service
Symptoms owners cite: Check engine light (P011A); Heater core clogged; Loss of heating function
Codes mentioned: P011A
Repairs/costs cited: Dealership performed second coolant flush without resolution. Exact repair cost not stated in narrative.
Recalls/TSBs owners mention: Issue noted in Mazda Technical Service Bulletin 07-007/19. Service manager (Mr. Frank Gozales, 866-502-9912) confirmed original Mazda coolant has caused this on 2016–2017 CX-5 models and identified it as Mazda problem. Mazda offered partial goodwill assistance ($775–$875) and assigned partial responsibility to customer. Multiple escalation attempts with Mazda Customer Experience (Case Manager Betty) unsuccessful.
Shift-to-park override / loss of park interlock
Vehicle allows driver to shut off engine while transmission remains in drive (D) without requiring shift to park (P). No warning chime or message alerts driver to this condition. Vehicle remains in drive with engine off, allowing it to roll freely on slope or incline.
When: Multiple instances reported; one case involved vehicle rolling ~3 yards in parking lot while driver was inside vehicle
Symptoms owners cite: Engine shut off while transmission in D; No warning chime or message; Vehicle rolling after engine shut off; No shift-to-park interlock enforcement
Repairs/costs cited: No repairs documented.
Recalls/TSBs owners mention: No manufacturer response documented.
High-pressure fuel pump failure
High-pressure fuel pump fails, illuminating check engine light and preventing engine start. Occurs at low mileage (30K miles).
When: 30,020 miles
Symptoms owners cite: Check engine light illumination; Vehicle will not start
Codes mentioned: P0192
Repairs/costs cited: Fuel pump replacement cost $920.60.
Recalls/TSBs owners mention: Owner notes that fuel pump recall exists for many Mazda vehicles but does not include this 2016 CX-5.
Engine bolt failure / internal block damage
Internal engine bolt loosened or fractured, exiting engine block and creating hole in block wall. Catastrophic internal damage.
When: Mileage not stated
Symptoms owners cite: Bolt hole in engine block
Repairs/costs cited: No repair cost documented.
Recalls/TSBs owners mention: No response documented.
Synthesized from 21 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had engine trouble with your 2016 Mazda CX-5?
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 2016 Mazda CX-5?
It's a meaningful issue. 21 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 8 complaints that reported odometer mileage, most engine failures cluster between 30,020 and 62,000 miles, with the median around 50,000. A quarter of owners report trouble before 30,020; a quarter make it past 62,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
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/2016/Mazda/CX-5.
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.