"Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On "
full bulletin at NHTSA ↗2015 Jeep Wrangler engine problems
moderate Owners of the 2015 Jeep Wrangler have filed 85 NHTSA complaints about the engine, typically surfacing around 51,892 miles at roughly $3,100 to repair (U.S. federal records, as of August 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Failure mileage
Complaints
85
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2011 Wrangler | 23 |
| 2012 Wrangler | 106 |
| 2013 Wrangler | 75 |
| 2014 Wrangler | 263 |
| 2015 Wrangler (this page) | 85 |
| 2016 Wrangler | 54 |
| 2017 Wrangler | 44 |
| 2018 Wrangler | 45 |
| 2019 Wrangler | 14 |
4fires
When does it fail?
Of the 85 engine complaints filed for the 2015 Jeep Wrangler, 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
Owners have filed 85 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Engine accounts for 19% of all owner complaints filed against this vehicle, across 10 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.
Water Quality When Mixed With Engine Coolant
full bulletin at NHTSA ↗wiTECH Small Leak Verification Test (SLVT) - P0456-EVAP SYSTEM SMALL LEAK
full bulletin at NHTSA ↗ADAPTER, Engine Oil Filter (Pentastar V6) For all 2014MY replace the Oil Filter Adapter (OFA). For any other MY review and follow instructions from the latest STAR Online S1809000007 available on Dealer Connect. Also, consider the following: 1) Remove OFA 2) Replace only the oil inlet O-ring and gaskets (seals kit in SOL above). 3) Re-install the OFA. For 2023MY and beyond use black O-ring. For 2022MY and prior use red O-ring. Note: When replacing OFA, it may be necessary to transfer the Oil Temp/Pressure Sensor from the old OFA to the new OFA.
full bulletin at NHTSA ↗ADAPTER, Engine Oil Filter (Pentastar V6) For all 2014MY replace the Oil Filter Adapter (OFA). For any other MY review and follow instructions from the latest STAR Online S1809000007 available on Dealer Connect. Also, consider the following: 1) Remove OFA 2) Replace only the oil inlet O-ring and gaskets (seals kit in SOL above). 3) Re-install the OFA. For 2023MY and beyond use black O-ring. For 2022MY and prior use red O-ring. Note: When replacing OFA, it may be necessary to transfer the Oil Temp/Pressure Sensor from the old OFA to the new OFA.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2015 Jeep Wrangler's 3.6L Pentastar engine shows a pattern of systematic failures across multiple critical subsystems. Most prevalent is the plastic oil cooler/filter housing that cracks and leaks between 26,000 and 95,000 miles, draining oil onto the exhaust manifold and undercarriage—a genuine fire hazard. Owners report the defect is so widespread that dealers had 25,000 units on national backorder. Replacements with the same plastic design fail again within years.
The "Pentastar tick"—loud valve train noise from worn rocker arms and lifters—appears starting around 20,000 miles and is identical to a defect Chrysler acknowledged and extended warranty coverage for on 2012–2014 models, yet refuses to cover on 2015 units despite the same failure mechanism. Dealers confirm they see this "all the time" and say Chrysler policy limits replacement to only damaged rockers at time of service, guaranteeing repeat failures on untouched components.
Cylinder head cracks, blown head gaskets, and radiator leaks are documented across multiple mileage ranges (31,000–88,000 miles), often preceded by coolant system issues. One owner underwent head replacement, then engine swap costs, then failed again—all within seven years at 84,000 miles. Engine stalling without warning, loss of power on highways, and even an engine fire are reported. Thermostat failures recur, and excessive oil in the breather system persists despite multiple repairs. Dealership diagnostic records often cannot replicate failures or read fault codes, leaving vehicles unrepaired.
Same Jeep Wrangler engine reports on nearby years: 2012 · 2013 · 2014 · 2016 · 2017
Failure modes owners describe
Plastic Oil Cooler/Filter Housing Cracking and Leaking
Plastic oil cooler adapter or oil filter housing assembly cracks, warps, or fails under thermal stress, allowing oil to drain from the engine. Oil leaks onto the exhaust manifold and undercarriage, creating fire hazards and potential engine seizure if not caught. Owners report the plastic component is inherently weak and replacement parts are now aluminum, but the defective plastic continues to be installed. Some owners have replaced the housing multiple times with the same plastic design.
When: Between 26,000 and 95,000 miles; one as early as 35,000 miles; some repeat failures within 1–4 years of prior replacement
Symptoms owners cite: Large oil leak visible on garage floor or driveway; Oil smell and smoke under the hood; No warning lights or gradual oil level drop without visible drips; Low oil readings on dipstick; Fire hazard due to oil contact with hot exhaust
Repairs/costs cited: Replacement of oil cooler assembly or oil filter housing at $800–$1,500+; requires removal of intake manifold. Owners cite 25,000 units on national backorder at dealerships. Repeat replacements needed on same vehicle.
Recalls/TSBs owners mention: No recall issued. Dealerships acknowledge the problem as common but claim Chrysler refuses to authorize full rocker replacement or design changes. Parts backorder nationwide due to volume of failures.
Rocker Arm and Lifter Wear ('Pentastar Tick')
The 3.6L Pentastar engine exhibits premature wear in the rocker arms and lifters, producing a loud ticking or knocking noise from the valve train. This is attributed to a design flaw in the valve train assembly. Owners report the dealer and Chrysler acknowledge this is a known problem on 2012–2014 models (warranty extended for those years) but refuse to acknowledge or cover the same defect on 2015 and later models, even though the failures occur with the same symptoms. Partial replacements lead to repeat failures on untouched rockers.
When: Between 20,500 and 80,200 miles; one failure at 31,000 miles, within warranty period but Chrysler declined responsibility
Symptoms owners cite: Loud audible ticking, knocking, or clicking noise from engine valve train; Engine shudder or vibration; Check engine light with misfire codes (P0304, P0302, etc.); Blue smoke from exhaust on cold restart; Engine power loss or hesitation
Codes mentioned: P0304 (cylinder #4 misfire), P0302 (cylinder #2 misfire)
Repairs/costs cited: Replacement of rocker arms, camshafts, and/or lifters at $2,000–$6,000+. Dealers report Chrysler policy limits replacement to only damaged components at time of service, not preventive full-set replacement. Repeat failures occur on rockers left behind from prior repairs.
Recalls/TSBs owners mention: Warranty extended for 2012–2014 model years. FCA refuses to acknowledge or extend coverage to 2015+ models despite identical failure mode. Service managers state they see the problem repeatedly.
Cylinder Head and Valve Failure
Left or right cylinder head develops cracks or internal defects, causing valve failure, excessive play in valve guides, burnt exhaust valves, and loss of compression. Often discovered after radiator replacement or persistent coolant loss, suggesting possible contamination during manufacturing. Some owners cite manufacturing debris left in the block.
When: Between 31,000 and 88,000 miles; one replacement at 51,892 miles; another failure occurring three years after initial rocker repair
Symptoms owners cite: Misfire in one or more cylinders (codes P0302, P0304, P0306); Reduced engine compression on affected cylinder (80 psi vs. 150 psi on good cylinders); Rough idle and vibration; Check engine light; Valve train ticking noise preceding head failure
Codes mentioned: P0302 (cylinder #2 misfire), P0304 (cylinder #4 misfire), P0306 (cylinder #6 misfire)
Repairs/costs cited: Full cylinder head replacement with rocker arms and lifters at $3,000–$3,500+. One complaint notes engine swap cost at $20,000+. Radiator and thermostat replacement often precedes or coincides with head failure. One vehicle required cylinder head replacement twice within seven years.
Recalls/TSBs owners mention: No recall. FCA acknowledges extended warranty for 2012–2014 models but not 2015+. Jeep refuses assistance for out-of-warranty claims despite noting it is a known issue on 2012 and earlier models.
Radiator Leaking or Premature Failure
Radiator develops cracks, holes, or seal leaks in the end cap or sidewall at low mileage. No visible external damage or overheating prior to failure. Antifreeze loss often gradual with no visible drips, detected only by odor or low coolant level at routine checks.
When: Between 9,000 and 38,375 miles; multiple cases before 36,000 miles
Symptoms owners cite: Low coolant reservoir at oil change intervals; Antifreeze smell (no visible puddles); Visible leak at radiator end cap or sidewall; Intermittent heating system performance (warm then cool air from vents); No heat output in cold weather
Repairs/costs cited: Radiator replacement at $800–$1,200+. Dealerships initially misdiagnose as oil filter leak. One owner replaced radiator, then later discovered head gasket failure, suggesting possible coolant contamination.
Recalls/TSBs owners mention: Not covered under warranty once three-year warranty expires. Dealership denies responsibility for manufacturing defect. No recalls issued.
Intermittent Engine Stalling with Loss of Power
Engine suddenly loses power or stalls while driving at various speeds (highway and city driving) without warning or prior symptoms. Vehicle restarts after stopping and restarting, but failure recurs. Dealership testing cannot replicate the failure. One case involved multiple failed attempts at diagnosis and a data recorder supplied by Jeep that produced unreadable codes due to system failures at multiple levels.
When: At 107,272 miles; another at 113,000 miles; another with intermittent failures; one case at 19 months old
Symptoms owners cite: Sudden loss of engine power while accelerating or cruising; Complete engine stall with no restart hesitation (restarts after 5–10 seconds or 2 hours); Check engine light or oil pressure warning light; Vehicle jerking or lurching; No prior stuttering, rough idle, or acceleration issues
Codes mentioned: Oil pressure sensor circuit failure (diagnosed at three separate dealerships)
Repairs/costs cited: Oil pressure sensor circuit replacement attempted multiple times at three different dealerships without resolving failure. No repair completed in several cases. One diagnostic tool supplied by manufacturer could not read recorded codes due to system issues.
Recalls/TSBs owners mention: Manufacturer contacted but provided no assistance. Dealerships unable to determine root cause despite multiple visits and sensor replacements.
Accelerator Pedal Loss of Friction and Fire Hazard
Accelerator pedal loses friction and travels all the way to the floor without producing acceleration. Simultaneously, smoke and flames appear under the hood. Fire department was called to extinguish the fire. Safety-critical failure at highway speeds.
When: At 138,934 miles (one case); another case at highway speed without mileage specified
Symptoms owners cite: Loss of friction on accelerator pedal; Pedal travels to floor without throttle response; Smoke and flames coming from under the hood; Check engine light illuminated; Engine fire requiring fire department response
Repairs/costs cited: Vehicle towed but not repaired. Independent mechanic unable to diagnose failure.
Recalls/TSBs owners mention: Manufacturer not notified in one case. No repairs attempted or completed.
Thermostat Failure and Overheating
Thermostat sticks closed or fails repeatedly, causing engine to overheat and dump coolant, slipping the serpentine belt and creating hazardous driving conditions. One owner replaced the thermostat three times over seven years of ownership.
When: Over seven years of ownership; multiple failures; one failure at recent date (1/21/2022)
Symptoms owners cite: Thermostat sticks closed; Engine overheating; Coolant dumping while driving; Serpentine belt slipping; Loss of power on highway; near-accident condition
Repairs/costs cited: Thermostat replacement (three replacements in seven years). One dealer replaced both thermostat and thermostat housing adapter.
Recalls/TSBs owners mention: No mention of recall or extended coverage.
Excessive Oil in Air Filter and Breather System
Oil accumulates in the air filter and intake system, causing check engine light (air flow meter code), loss of power, and inability to accelerate beyond 70 MPH. PVC valve and camshaft replacement attempted but problem recurs. Oil catch can installed as temporary measure.
When: Mileage not specified
Symptoms owners cite: Oil in air filter box; Check engine light (air flow sensor code); Engine power loss; Cannot exceed 70 MPH; drops to 60 on incline; Power loss clears briefly then returns
Codes mentioned: Air flow sensor code
Repairs/costs cited: PVC valve and camshaft replaced; air flow sensor replaced; oil catch can installed as workaround. Multiple service visits without resolution.
Recalls/TSBs owners mention: No mention of manufacturer response.
Check Engine Light with Misfire and Difficulty Diagnosing
Check engine light comes on repeatedly with misfire codes but dealership cannot keep the light on long enough to read codes. Multiple service visits (4+) with recurring problem; dealership resorts to replacing single coil packs without fully diagnosing the root cause.
When: Mileage not clearly specified; vehicle in shop 7 times over 7 months (June 2015 to January 2016); another case with 4+ visits
Symptoms owners cite: Check engine light flashing intermittently; Misfire code appears when light is on, but light does not stay on for full diagnosis; Engine loses power when driving uphill; Inability to maintain freeway speed; Power loss intermittent
Codes mentioned: P0300 (general misfire detected)
Repairs/costs cited: Single coil pack replaced (temporary fix); engine light returns. Vehicle in shop 7 times in 7 months with 24+ days in shop. Cylinder head and camshafts eventually replaced; software updated. Dealership STAR team (Chrysler tech support) involved with no clear resolution documented.
Recalls/TSBs owners mention: Chrysler STAR team engaged but no resolution provided.
Blown Head Gasket
Engine develops blown head gasket, causing coolant loss and engine failure. One owner reports this as the third engine-related problem in seven years with only 84,000 miles.
When: At 84,000 miles (third engine problem on same vehicle)
Symptoms owners cite: Coolant loss; Engine failure
Repairs/costs cited: Engine replacement quoted at $11,000.
Recalls/TSBs owners mention: No assistance offered.
Synthesized from 85 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 7 most recent
The contact owns a 2015 Jeep Wrangler. The contact stated that while driving at 40-50 MPH on the highway far right lane, several unknown warning lights illuminated as smoke was coming from under the hood. The contact stated that the accelerator pedal felt as if the friction was lost against her foot, and the accelerator pedal traveled all the way to the floorboard as the vehicle failed to…
Cracked and leaking oil cooler housing
My 2015 Jeep wrangler with less than 36,000 miles (current mileage is 31,000) developed a hole in the upper right (facing the vehicle) on the radiator. Only factory authorized antifreeze was in the cooling system. In fact, the coolant had never been touched since purchasing it new april 17th, 2015. This past fall I knew I had a leak and took it to the dealer. They said it was leaking oil around…
Smell of antifreeze
Oil filter housing has cracked and leaking oil. Appears to be widespread problem. Many jeeps built after 2014 seem to have the same recurring problem. The plastic housing is defective.
FAULTY OIL FILTER HOUSING-KNOWN TO MANUFACTURE , causing vehicle to SHUT DOWN, oil sensors not working, shut down on main hwy, potential fire hazard with oil all over vehicle under carriage and in valley top of motor . THIS A WELL KNOWN PROBLEM that no-one wants to address i'm on my 3rd housing and all oem mopar parts( PLASTIC)at tune 1200+, PLEASE INVESTIGATE MAKE THEM STOP USING PLASTIC…
Faulty oil cooler. 2 different mechanics reported this as a common problem with 2015 jeep wrangler. Due to the way this model was made, the oil cooler is too close to the hot engine making it faulty. As well as the parts around it all have to be replaced. I've been told not to drive the vehicle due to fire hazard. The estimates I've been given are $1400 and up. I've also read many complaints…
Had engine trouble with your 2015 Jeep Wrangler?
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 Jeep Wrangler?
It's a documented issue but not catastrophic. 85 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?
Across the 41 complaints that reported odometer mileage, most engine failures cluster between 28,900 and 77,000 miles, with the median around 51,892. A quarter of owners report trouble before 28,900; a quarter make it past 77,000. 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/2015/Jeep/Wrangler.
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.