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severe Owners of the 2014 Kia Optima have filed 215 NHTSA complaints about the engine, typically surfacing around 94,300 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 →
| Model year | engine complaints |
|---|---|
| 2010 Optima | 7 |
| 2011 Optima | 193 |
| 2012 Optima | 296 |
| 2013 Optima | 449 |
| 2014 Optima (this page) | 215 |
| 2015 Optima | 451 |
| 2016 Optima | 313 |
| 2017 Optima | 125 |
| 2018 Optima | 103 |
Of the 215 engine complaints filed for the 2014 Kia Optima, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 mi.
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.
Engine accounts for 37% of every owner complaint on file for this vehicle — the dominant problem area across 11 categories tracked.
Owners have filed 215 engine complaints against 1 active recall — roughly 215 complaints per campaign.
Bearing wear may result in the engine seizing, increasing the risk of a crash.
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.
TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the table on pages 9 and 10 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802Y/Z) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information related to the Technical Service Bulletin previously published PI1802 titled "Knock Sensor Detection System - ECU Logic Improvement"; equipped w/THETA II engine. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below returns to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal R
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1803Y/Z) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information related to the Technical Service Bulletin previously published PI1803 titled "Knock Sensor Detection System - ECU Logic Improvement" equipped w/THETA II engine. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below returns to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Ra
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: BEARING CLEARANCE TESTER (BCT) PROCEDURES - This bulletin provides information regarding test procedure of the Bearing Clearance Tester (BCT) Special Service Tool (SST). The SST comes pre-calibrated from the supplier however, in some cases, due to variable shop compressor air pressure, the SST may need to be re-calibrated to ensure that the tool provides accurate readings when testing the engine rod bearing wear. The calibration and BCT measuring point maintenance is included in this bulletin.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The 2014 Kia Optima has a pervasive engine failure problem that Kia attributes to machining debris (NHTSA Campaign 17V224000). Metal particles left in the crankshaft during factory production contaminate the oil, accelerating bearing wear. Owners describe sudden engine seizure while driving—one moment normal operation, the next complete loss of power at highway speed, no restart capability. The vehicle goes immobile in traffic with stiff steering and manual brakes. Some failures happen at 10,000 miles; most occur between 40,000 and 165,000 miles. Engine replacement costs $5,400–$8,000 out of pocket when Kia denies warranty coverage, which happens frequently. Kia's knock sensor software update (Campaign PI1803) detects the problem but does not fix it—it triggers engine shutdown mid-traffic to "prevent catastrophic failure," yet that shutdown itself becomes the catastrophic event. Owners also report rapid oil consumption requiring oil top-ups every 10 days, sludge despite maintenance, engine fires after repair (missing fuel line clips), and dealership stonewalling—claiming they "cannot hear" obvious knocking, demanding complete maintenance records from prior ownership, or saying prior owners should have completed recalls before sale. Warranty denial is routine even for early failures; rental vehicle costs fall on owners; Kia's recall timeline has been slow and coverage inconsistent.
Same Kia Optima engine reports on nearby years: 2011 · 2012 · 2013 · 2015 · 2016
Engine abruptly loses power and stops running while driving, often at highway speeds, with no warning or diagnostic codes. Vehicle becomes immobile in traffic.
When: Typically between 30,000-165,000 miles; some failures very early (10,000 miles documented)
Symptoms owners cite: Complete loss of engine power while driving; Engine will not restart after stalling; Difficulty steering and braking when power lost; No warning lights or check engine light before failure; All dashboard lights come on during event
Codes mentioned: Bearing knock detected by knock sensor, Engine seized due to bearing failure, Metal debris in oil passages
Repairs/costs cited: Engine replacement required; owners cite costs $5,400-$8,000 when not covered by recall/warranty. One rebuilt engine from non-Kia supplier failed again.
Recalls/TSBs owners mention: NHTSA Campaign 17V224000 (metal debris in crankshaft machining); Campaign PI1803 (knock sensor software update); Kia often denies coverage citing incomplete prior recalls, missing maintenance receipts, or previous owner's failure to respond to recall notices.
Factory machining debris from crankshaft production was not fully removed during assembly, contaminating engine oil. Bearing wear accelerates, leading to seizure.
When: 10,000-165,000 miles; defect present in engines manufactured Aug 2010-May 2014 for 2011-2014 models
Symptoms owners cite: Engine knocking noise audible at idle and highway speeds; Loud metallic clinking from engine; Elevated metal particles in oil; Bearing wear causing rod knock
Codes mentioned: P0011-P0014 (camshaft timing codes), Metal contamination detected in oil analysis
Repairs/costs cited: Requires full engine replacement; crankshaft defect is not field-repairable. Some owners report dealerships claim they cannot hear knocking and deny warranty coverage.
Recalls/TSBs owners mention: NHTSA Campaign 17V224000; Kia also issued Campaign PI1803 (knock sensor software to detect and shut down engine before catastrophic failure). Many owners report recall not applied to their VIN or previous owner never responded to recall letter.
Engine stalls without warning while driving. Vehicle will not restart, leaving occupants stranded. Often occurs on highways in unsafe locations.
When: Various mileages; 48,000, 67,000, 40,000 miles reported
Symptoms owners cite: Sudden engine shutoff with no warning; All dashboard lights flash on simultaneously; Power steering becomes very stiff; Brakes become manual (power loss); Engine immobilizer engages after stall
Codes mentioned: No codes detected by scanner in some cases, Engine immobilizer engaged
Repairs/costs cited: Engine replacement needed; owners report being stranded 100+ miles from home, long tow waits (90+ minutes reported), and having to pay for rental vehicles out of pocket.
Recalls/TSBs owners mention: Some approvals via warranty; others denied due to incomplete recalls or warranty expiration. Kia does not provide loaner vehicles in many cases; owners told they must rent and seek reimbursement after repair.
Engine rapidly consumes oil, requiring additions every 10 days. Sludge accumulates in engine despite regular oil changes, starving bearings of lubrication.
When: Within 2 years of ownership; 19,000-30,000 miles reported
Symptoms owners cite: Oil level drops rapidly between services; White or blue-white smoke from exhaust; Engine rattling or knocking; Low oil warning illuminates frequently; Sludge detected during diagnosis
Codes mentioned: P0011-P0014 (variable valve timing codes), Low oil pressure warning
Repairs/costs cited: Valve cover gasket replacement at $300-500+ reported as temporary fix; engine ultimately requires replacement ($4,000-$6,500 out of pocket when not covered). Owners cite Kia service claiming wrong oil used, even with owner's manual confirmation.
Recalls/TSBs owners mention: Kia denies warranty coverage citing lack of complete maintenance records or claiming wrong oil type used. Some owners required to pass multiple oil consumption tests before engine replacement approval.
Knock sensor detects bearing wear but engine shuts down in response rather than entering safe limp mode. Software update PI1803 raises detection sensitivity but does not prevent failure.
When: Following knock sensor software update PI1803; failures occur within days to weeks post-update
Symptoms owners cite: Engine cuts off at highway speed (65-80 mph) after software update; Knock sensor triggers engine shutdown; Vehicle loses all power mid-traffic; No way to coast safely to roadside
Codes mentioned: Knock sensor detection codes, Software PI1803 applied
Repairs/costs cited: Software detects problem but does not fix underlying bearing issue. Engine replacement still required.
Recalls/TSBs owners mention: Kia service explained software is intended to detect problem and shut engine down to prevent catastrophic engine damage. However, this creates safety hazard by disabling vehicle in traffic. Campaign PI1803 is a detection patch, not a fix.
After engine replacement under recall, vehicle catches fire. Investigation shows missing fuel line clip between tank and engine, critical component left off during assembly.
When: Days to weeks after engine replacement service
Symptoms owners cite: Smoke and flames coming from under hood; Gasoline smell from engine and cabin after replacement; Fire starts without warning; No prior warning lights or symptoms
Repairs/costs cited: Vehicle total loss in fire. Forensic fire investigator found missing fuel line clip (NHTSA Campaign 21V331000 related). Dealership error during engine installation.
Recalls/TSBs owners mention: Kia issued Campaign 21V331000 (fuel system) but only as reactive measure after fires reported. Owner states dealer told them gasoline smell and leak after replacement were 'normal and would subside.'
Dashboard warning 'Check Hybrid system. Stop vehicle and turn off engine' triggers automatic engine shutdown. Occurs without prior warning.
When: Every six months initially, escalating to multiple times per week over time
Symptoms owners cite: Dashboard warning: 'Check Hybrid system. Stop vehicle and turn off engine'; Vehicle shuts off 15-30 seconds after warning appears; Occurs at any speed (70 mph freeway, 20 mph residential streets); Owner must find safe place to pull over immediately
Codes mentioned: High voltage fuse issues
Repairs/costs cited: Dealership service replaced high voltage fuse (125A changed to 150A based on online reports); issue persisted. No permanent fix found.
Recalls/TSBs owners mention: Dealership kept car one month, provided runaround, never completed fuse replacement. No lasting resolution provided.
Alternator bracket breaks suddenly without physical impact or visible cause. Possible connection to engine overheating issues.
When: Spontaneous failure during normal driving
Symptoms owners cite: Loud noise from engine; Engine locks up and shuts off; Flash of light from under hood; No physical impact or accident
Repairs/costs cited: Alternator not damaged; serpentine belt intact; cause remains unexplained by mechanics.
Synthesized from 215 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
Tl* the contact owned a 2014 Kia optima lx. The contact stated while driving at approximately 60 MPH, the vehicle stalled without warning. As a result, the contact crashed into a guardrail which stopped the vehicle from going over an embankment. The air bags failed to deploy. The failure had occurred several times prior to the crash. The vehicle was towed to a towing company and then towed to the…
The contact owns a 2014 Kia Optima. The contact stated that while driving at various speeds, the vehicle would suddenly shut off without warning. The contact indicated that on several occasions, it was discovered that the engine oil level was extremely low although oil had recently been added to the engine. The vehicle was taken to an independent mechanic who was unable to determine the cause of…
The contact owns a 2014 Kia Optima. The contact received notification of NHTSA Campaign Number: 21V331000 (Service Brakes, Hydraulic). The contact stated that while driving at an undisclosed speed, the vehicle stalled. The contact was able to restart the vehicle; however, the failure recurred while driving. The vehicle was towed to the dealer, where it was diagnosed with engine failure. The…
I have a 2014 Kia optima that I purchased 3 years ago. My car lost all power on the highway and the motor is making a knocking noise I've taken it to my Kia dealer who always does my oil changes and they are saying that I need a new motor but no recalls are falling u see my VIN in their paperwork. Everything is always up to date on my vehicle oil changes to detailing once a week and this happens…
80,000 miles on vehicle and engine failed. Vehicle was in motion and began to slow down on the highway. Lights in the dashboard appeared. Vehicle was towed by aaa and determined engine failed.
At a stop light when I went to accelerate car had a hesitation and smoke came out the exhaust pipe. No engine, or oil light came on. The car drove and ran as it always has. Got home call Kia of dayton for an appointment. Took car in, couple days later I was called and told I had sludge built up and needed a new engine and they will submit it to Kia for approval. Kia denied repairs. I looked up…
While on the highway trying to make a pass I suddenly loss power. I wasn't able to get the engine restarted once I pulled over. After a period of time on the side of the I restarted the car and was hearing a consistent knocking noise coming from me engine. Never had any issues or anything with the car.
Car cuts off while driving, doesn't matter if going 40 MPH or 80 MPH.......engine tach drops to "0"........foot feed doesn't respond........you keep trying to give gas up and down.......finally will buck as trying to respond ......as cutting in and cutting out.....finally will then drive as normal........you may coast down to from 80 to 20 MPH before it goes again. No dash lights indicated,…
I was driving in a 2014 Kia optima with an estimate 55,400 mile on it down I-285 east when engine suddenly lost power. I notice an odd clicking noise, check engine light came and stayed on, and RPM dropped. I safely merged over in 4 lines of traffic on shoulder and turned engine off. The car sputtered when I cracked it on the side of the road, the car sounded terrible, extremely rough idle and…
Tl-contact owns a 2014 Kia optima lx.... Recall letter from Kia regarding engine replacement... Defect causes engine to stall.... Contact filed complaint through Kia... Engine of vehicle has not stalled yet... Contact upset with Kia service.... Kia stated engine needed to go through testing before engine is replaced.... Contact had state check engine light came on while driving then went off.…
It's a meaningful issue. 215 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
Across the 129 complaints that reported odometer mileage, most engine failures cluster between 56,127 and 130,000 miles, with the median around 94,300. A quarter of owners report trouble before 56,127; a quarter make it past 130,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
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.
Yes — 1 active recall(s) cover engine issues on this vehicle. Recall fixes are always free regardless of mileage or warranty status. Use the VIN decoder at the top of the page to check if your specific vehicle is affected.