The 2015 4Runner with the 4.0L 1GR-FE V6 is generally solid, but suffers from a catastrophic piston-slap defect in certain engine builds and persistent transmission cooler line failures that can silently destroy the transmission.
1GR-FE Piston Slap and Secondary Air Injection System Failure Leading to Engine Destruction
Occasional · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Cold-start rattle or knocking for 30-60 seconds that worsens over time, P0418 or P0419 secondary air injection codes, Metal shavings in oil, eventual bearing failure and rod knock, Catastrophic engine seizure if ignored
Fix: The secondary air injection pump can fail and send debris into cylinders, scoring cylinder walls and causing piston slap. Once piston skirts are damaged, it progresses to bearing wear. Requires complete engine rebuild or replacement: 20-30 labor hours for rebuild, 16-20 for used/reman swap.
Estimated cost: $4,500-8,500
External Transmission Oil Cooler Line Failure at Radiator
Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Pink fluid puddle under front of vehicle, Transmission slipping or delayed engagement after leak starts, Milky transmission fluid (coolant contamination) if internal cooler also fails, Complete transmission failure if driven after mixing fluids
Fix: External cooler lines crack at the crimp connections to the radiator. If you catch it early, it's just lines (2 hours). If coolant mixes with ATF, you need full transmission flush, possibly torque converter replacement, and radiator. If driven contaminated, full transmission replacement: 8-12 hours.
Estimated cost: $350-800 for lines only, $4,000-6,500 for transmission replacement
Exhaust Manifold Crack and Stud Failure
Common · medium severity
Typical onset: 80,000-140,000 mi
Symptoms: Ticking or tapping noise from engine bay that increases with RPM, Exhaust smell in cabin, Visible soot around manifold joints, P0420 catalyst efficiency code sometimes appears
Fix: The 1GR-FE manifolds crack between ports or the studs break off in the head due to heat cycling. Studs stripped in the aluminum head are the real problem—often requires helicoil inserts or head removal for proper extraction. 4-6 hours per side if studs extract clean, 8-12 if head comes off.
Estimated cost: $800-1,800 per side
Rear Differential Pinion Seal Leak
Occasional · low severity
Typical onset: 70,000-110,000 mi
Symptoms: Gear oil drips on driveway under rear axle, Whining from rear end if fluid gets low, Visible oil on differential cover and pinion area
Fix: Pinion seal hardens and leaks. Requires driveshaft removal, pinion nut torque spec is critical (must not over-tighten or you'll change bearing preload). 2-3 hours labor. Catch it early before the diff runs low on fluid.
Estimated cost: $350-550
Transmission Mount Collapse
Occasional · medium severity
Typical onset: 90,000-130,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear that goes away in Park/Neutral, Visible sag or torn rubber on transmission crossmember mount
Fix: The large rear transmission mount fatigues and collapses, letting the transmission sag and contact the crossmember under load. Replacement is straightforward: support transmission, unbolt mount, swap in new. 1.5-2 hours.
Estimated cost: $250-450
Front Lower Ball Joint Wear
Common · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering or vague steering feel, Uneven tire wear on inside edge, Play visible when prying on control arm with tire lifted
Fix: Lower ball joints wear faster than uppers due to load. Toyota sells the whole lower control arm assembly (no press-in ball joint available from dealer). Aftermarket press-in joints available but arm swap is cleaner. 2-3 hours per side including alignment.
Estimated cost: $500-900 per side with alignment
Owner tips
Change transmission fluid every 30k-40k miles (Toyota says 'lifetime' but that's wishful thinking—A750F does not like old fluid)
Inspect transmission cooler lines at every oil change after 60k miles—catching a weep early saves $5k
If you hear cold-start rattle, get an oil analysis immediately to check for fuel dilution and bearing metals before it grenades
Use quality 0W-20 oil and change at 5k intervals—this engine is sensitive to oil quality due to tight piston-to-wall clearances
Buy one if engine history is clean and trans cooler lines have been replaced—avoid high-mileage examples with cold-start noise.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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Toyota Motor Engineering & Manufacturing (Toyota) recalled certain 2018-2019 4Runner, Highlander, Camry, Land Cruiser, Sequoia, Sienna, Tacoma and Tundra, and Lexus RC 300, RC 350, GS 350, GX 460, IS 300, LC 500, LS 500, LX 570, RX 350L, and 2019 Toyota Avalon and Corolla, and certain Lexus NX 300, and ES 350 vehicles on January 13, 2020.
On March 4, 2020, Toyota expanded the recall to include certain 2014-2015 Toyota 4Runner and Land Cruiser, 2018 Avalon, Corolla, 2014 FJ Cruiser, 2017 Sienna and Lexus 2018 ES 350, 2018-2019 GS 300, 2013-2014 GS350, 2014-2015 GX 460, IS 350 and LX 570, 2014 IS F, 2018-2019 IS 350, LC 500H and LS 500H, 2013-2015 LS 460, 2015 NX 200T and RC350, 2017 RC 200T and RX 350. Toyota also removed the 2018-2019 Toyota 4Runner and Land Cruiser and 2018-2019 Lexus GX 460 and LX 570 and 2019 NX300 from inclusion in this recall. On March 19, 2020, Toyota expanded the recall to include 2015 Lexus GS350 vehicles. The low-pressure fuel pump inside the fuel tank may fail.
Consequence: If the fuel pump fails, the engine can stall while driving, increasing the risk of a crash.
Remedy: Toyota will notify owners, and dealers will replace the fuel pump, free of charge. The recall began May 4, 2020. Owners may contact Toyota customer service at 1-888-270-9371 or Lexus customer service at 1-800-255-3987. Toyota's numbers for this recall are 20TB02 and 20TA02 for Toyota vehicles and 20LB01 and 20LA01 for Lexus vehicles.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 19V741000
2019-10-17 · EA15001
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2010-2016 4Runner, 2003-2006 Tundra, 2003-2013 Corolla, 2009-2010 Corolla Matrix, 2004-2005 RAV4, 2002-2007 Sequoia, 2011-2013 Sienna, 2008-2012 Scion xB, 2008-2009 Lexus IS-F, 2007-2012 Yaris and Lexus ES350, 2010-2017 Lexus GX460, 2002-2010 Lexus SC430, 2006-2012 Lexus IS250 and IS350 and 2010-2015 Lexus IS250C and IS350C vehicles.
These vehicles had their driver or passenger frontal air bag inflators previously replaced under a prior recall using inflators of the same design. The inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.
Remedy: Toyota will notify owners. Depending on the vehicle model, dealers will replace the front driver inflator, front passenger airbag inflator, the airbag assembly, or the front passenger airbag sub-assembly and inflator. The recall began November 20, 2019. Owners may contact Toyota customer service at 1-888-270-9371 or Lexus customer service at 1-800-255-3987. Toyota's numbers for this recall are J0A, J0B, and J0C. Lexus' numbers for this recall are JLI, JLJ, and JLK.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 19V005000
2019-01-09 · EA15001
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2014-2016 Toyota 4Runner, 2014-2015 Scion xB, Lexus IS350C, IS250C, 2014 Toyota Sienna, Lexus IS-F, and 2014-2017 Lexus GX460 vehicles sold, or ever registered in the states of Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands or "Zone A."
Toyota is also recalling certain 2011-2013 Toyota Corolla, Corolla Matrix, Lexus IS250, IS350, 2011-2016 4Runner, 2011-2015 Scion xB, Lexus IS350C, IS250C, 2011-2014 Toyota Sienna, Lexus IS-F, 2011-2017 Lexus GX460, and 2011-2012 Lexus ES350 vehicles ever registered in the states of Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia or "Zone B."
Toyota is also recalling certain 2010-2013 Toyota Corolla, Corolla Matrix, Lexus IS350, 2010-2016 4Runner, 2010-2013 Lexus IS250, 2010-2015 Scion xB, Lexus IS350C, IS250C, 2010-2017 Lexus GX460, 2010-2014 Lexus IS-F, and 2010-2012 Lexus ES350 vehicles ever registered in the states of Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming or "Zone C."
These vehicles are equipped with air bag inflators assembled as part of the passenger frontal air bag modules, used as original equipment or replacement equipment (such as after a vehicle crash necessitating replacement of the original air bags), that may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.
Remedy: Toyota will notify owners. Depending on the vehicle model, dealers will replace the front passenger air bag inflator, or replace the air bag assembly. The recall began February 15, 2019. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's numbers for this recall are "Zone A" Toyota: G0P, Lexus: GLG; "Zone B" Toyota: G0R, Lexus GLH; "Zone C" Toyota: H0A, and Lexus: HLA.
STRUCTURE:BODY:HOOD · 17V763000
2017-11-29
Southeast Toyota Distributors, LLC (SET) is recalling certain 2015-2018 Toyota 4Runner vehicles equipped with an accessory Billet Grille Overlay installed by SET or provided by SET and installed by SET dealers. The U-nut that secures the overlay grille may fracture, allowing the Billet Grille Overlay to detach from the vehicle.
Consequence: If the Billet Grille Overlay detaches while driving, it can become a road hazard, increasing the risk of a crash.
Remedy: SET will notify owners, and dealers will replace the securing U-nuts with upgraded hardware, free of charge. The recall is expected to begin January 26, 2018. Owners may contact SET customer service at 1-866-405-4226. SET's number for this recall is SET17C.
STRUCTURE:BODY:HOOD:HINGE AND ATTACHMENTS · 17V425000
2017-07-03
Southeast Toyota Distributors, LLC (SET) is recalling certain 2011-2016 Toyota Tacoma and 4Runner vehicles equipped with accessory hood scoops installed by SET or SET dealers. The adhesive attaching the hood scoop may weaken, allowing the hood scoop to detach from the vehicle.
Consequence: If the hood scoop detaches, it may become a road hazard, increasing the risk of a crash.
Remedy: SET will notify owners, and dealers will mechanically fasten the scoop to the hood, free of charge. The recall began on September 1, 2017. Owners may contact SET customer service at 1-954-429-2000. SET's number for this recall is SET17B.
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE · 16V577000
2016-08-03
Southeast Toyota Distributors, LLC (SET) is recalling certain model year 2010-2015 Toyota 4Runner vehicles manufactured September 3, 2009, to December 1, 2014. The affected vehicles may be equipped with accessory exhaust tips installed by SET or SET dealers that may contact people and possibly burn them while they are standing behind the vehicle.
Consequence: Contact with an exhaust tip may result in personal injury.
Remedy: SET will notify owners, and dealers will install a re-designed exhaust tip that is smaller in diameter and is more recessed behind the bumper, free of charge. The recall began September 15, 2016. Owners may contact SET customer service at 1-866-405-4226. SET's number for this recall is SET16D.
EQUIPMENT:OTHER:LABELS · 16V228000
2016-04-20
Gulf States Toyota, Inc. (Gulf States) is recalling certain model year 2015-2016 Toyota 4Runner vehicles manufactured September 22, 2014, to March 23, 2016 and equipped with accessories installed by Gulf States. The Load Carrying Capacity Modification Label may not reflect the correct added weight of the installed accessories. As a result, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 110, "Tire Selection and Rims for Passenger Cars."
Consequence: An incorrect label may result in the vehicle being overloaded, increasing the risk of a crash.
Remedy: Gulf States will notify owners, and dealers will install an accurate label, free of charge. The recall began on June 1, 2016. Owners may contact Gulf States customer service at 1-800-444-1074. Gulf States' number for this recall is 16R2.
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE · 15V515000
2015-08-13
Southeast Toyota Distributors, LLC (SET) is recalling certain model year 2010-2015 Toyota 4Runner vehicles manufactured March 29, 2010, to July 30, 2015. The affected vehicles may be equipped with accessory exhaust tips installed by SET or SET dealers that may contact people and possibly burn them while they are standing behind the vehicle.
Consequence: Contact with an exhaust tip may result in personal injury.
Remedy: SET will notify owners, and dealers will install a re-designed exhaust tip that is smaller in diameter and is more recessed behind the bumper, free of charge. The recall began on September 22, 2015. Owners may contact SET customer service at 1-866-405-4226. SET's number for the recall is SET15D.
EQUIPMENT · 14V828000
2014-12-30
Southeast Toyota Distributors, LLC (SET) is recalling certain model year 2014-2015 Toyota 4Runner, Tacoma, FJ Cruiser, Land Cruiser, RAV4, Scion FRS, and XB vehicles. The affected vehicles may have accessories installed by SET, such as running boards or other items, that were incorrectly installed. The accessory attaching fasteners were not tightened with the proper torque, possibly causing the accessory to detach from the vehicle.
Consequence: Accessories that detach from a vehicle may result in a vehicle crash and/or personal injury.
Remedy: SET will notify owners, and dealers will inspect and tighten the affected bolts, free of charge. The recall began February 23, 2015. Owners may contact SET customer service at 1-866-405-4226. SET's number for this recall is SET-14B.
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