I’m reporting a serious safety issue with this Infiniti. Tonight while driving the engine just shut off. We fortunately were not in an accident, but easily could have been. What terrifies me is that this happened twice a few years ago. It was still under warranty so Infiniti inspected it and replaced the entire transmission. The warranty is expired, but this huge safety issue is still happening!
2015 INFINITI QX60 engine problems
moderate 10 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
10
Recalls
0
Avg fix
$3,100
What stands out
Among the 6 model years of INFINITI QX60 in our records for engine problems, this one ranks #2 by owner-complaint volume.
No new NHTSA engine complaint has been filed on this vehicle in over 4 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2015 QX60 shows multiple reports of engine misfiring, stalling, and loss of power across various mileage ranges, with owners alleging known defects in valve systems and cooling fans that Infiniti has not recalled. Serious safety concerns exist around unexpected engine shutdown while driving, combined with warranty coverage that expires at 5 years, leaving owners responsible for expensive repairs shortly after purchase.
Owners report eight distinct engine failure patterns on 2015 QX60s. Coolant intrusion into cylinders appears in at least one complaint at 77,000 miles, with a dealership quoting $25,600+ for engine replacement. Valve system issues causing low-speed acceleration stuttering show up as a known defect in 2013–2015 models (2014 manufacture date), with dealerships refusing warranty coverage and demanding full valve system replacement at owner expense.
Stalling and loss of power occur sporadically—at 20, 30, 40, and 60 mph—with no warning lights and repair shops unable to reproduce or diagnose failures. One owner reports the engine shut off completely while driving, creating imminent accident risk; Infiniti replaced the transmission under warranty for similar failures years earlier, but declined assistance after warranty expired.
Cooling fan malfunction appears at 39,000 miles and is described as a known defect; replacement costs $1,200. Rough idle with loud sputtering is reported at idle with no check engine light. Most failures occur early in ownership (30,000–77,000 miles) despite no prior warning signs. Dealerships consistently fail to locate diagnostic codes or reproduce failures, leaving owners without recourse.
Same INFINITI QX60 engine reports on nearby years: 2014
Failure modes owners describe
Coolant intrusion into cylinders / head gasket failure
Coolant leaking into cylinder 2 causes misfiring. Complaint #1 reports dealership diagnosis of coolant leakage into cylinder 2 requiring engine replacement at 77,000 miles. No check engine light, overheating, or smoking present. Second opinion dealership offered $3,000 diagnostic dive but owner was unable to confirm root cause due to warranty expiration.
When: 77,000 miles; March 2023
Symptoms owners cite: Misfiring; Coolant leakage into cylinder 2; No check engine light; No overheating; No smoking
Repairs/costs cited: Dealership quoted $25,671.77 for engine replacement; second opinion dealership quoted $3,000 for deep diagnostic
Recalls/TSBs owners mention: Infiniti consumer affairs declined to assist in determining root cause after warranty expiration (12/19/2022)
Valve system malfunction causing acceleration stuttering
Progressive stuttering during low-speed acceleration, worsening over time. Owner reports dealership identified valve system issue after requiring a $100 computer reprogramming first. Complaint #2 notes this is a known defect in 2013, 2014, and some 2015 models manufactured in 2014. Dealership recommended replacing entire valve system but declined warranty coverage, citing it as consumer responsibility.
When: Infrequent initially, worsening over time; complaint filed after 1,000+ miles of diagnostic driving
Symptoms owners cite: Stuttering during low-speed acceleration; Progressive worsening over time; Potential for transmission failure (per owner research)
Repairs/costs cited: Dealership offered discount on valve system replacement but stated repair is consumer responsibility
Recalls/TSBs owners mention: None mentioned; dealership treated as consumer responsibility despite owner assertion of known defect
Violent jerking / loss of power under load
Vehicle jerked violently while driving at 20 mph with no warning lights. Vehicle restarted but failure recurred. Non-Infiniti Toyota dealership unable to locate any diagnostic code.
When: 70,070 miles
Symptoms owners cite: Violent jerking at 20 mph; No warning indicators illuminated; Failure recurred after restart
Repairs/costs cited: No repair completed; no diagnostic code found
Recalls/TSBs owners mention: Manufacturer notified but did not assist
Engine stalling under load
Vehicle stalled while driving at 40 mph and again in December 2018. Owner required restart to continue. Infiniti dealership unable to duplicate failure during diagnosis.
When: 30,000 miles; also occurred previously in December 2018
Symptoms owners cite: Stalling at 40 mph; Required manual restart; Intermittent / unable to reproduce
Repairs/costs cited: No repair completed; failure could not be duplicated
Recalls/TSBs owners mention: No notification to manufacturer reported
Radiator cooling fan malfunction
Radiator cooling fan failed at 39,000 miles. Owner reports this is a known defect affecting 2015 Infiniti QX60 and Nissan Pathfinders. Risk of engine overheating, failure, or fire. Infiniti aware but has not issued recall.
When: 39,000 miles
Symptoms owners cite: Cooling fan malfunction; Risk of engine overheating; Risk of engine failure; Fire hazard
Repairs/costs cited: Fan assembly replacement costs $1,200
Recalls/TSBs owners mention: No recall despite known defect; burden placed on consumers
Stalling at highway speed
Vehicle stalled while driving at 60 mph. Owner pulled over, waited 30 minutes, then restarted and drove home. Dealership diagnosis found no failure. Occurred at 100,000 miles.
When: 100,000 miles
Symptoms owners cite: Stalling at 60 mph; Required 30-minute wait before restart
Repairs/costs cited: No repair completed; no failure found
Recalls/TSBs owners mention: Manufacturer notified
Engine shut-off while driving / repeated stalling issue
Engine shut off completely while driving, creating dangerous safety situation. Owner reports same failure occurred twice a few years prior when vehicle was under warranty; dealership replaced entire transmission at that time. Current failure represents recurrence of known issue after warranty expiration.
When: Prior occurrences under warranty (timing not specified); current occurrence after warranty expiration
Symptoms owners cite: Complete engine shut-off while driving; Safety hazard / risk of accident; Intermittent recurrence
Repairs/costs cited: Entire transmission replaced during prior warranty claim
Recalls/TSBs owners mention: Transmission replaced under warranty in prior incidents; no assistance offered for current post-warranty occurrence
Idle quality / rough idle with sputtering
Loud sputtering from engine while vehicle is stopped at idle, with sensation that engine may stall. No check engine light illuminated. Issue persisted despite passing state inspection at Infiniti dealership less than one week prior.
When: Shortly after passing state inspection at dealership
Symptoms owners cite: Loud sputtering at idle; Sensation of imminent stall; No check engine light
Repairs/costs cited: No repair mentioned
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had engine trouble with your 2015 INFINITI QX60?
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 2015 INFINITI QX60?
It's a documented issue but not catastrophic. 10 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 10 complaints filed, engine issues most often appear around 68,768 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/2015/INFINITI/QX60.
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.