TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - 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 relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, and the transmission oil cooler is transferred to the new transmission.
full bulletin at NHTSA ↗2017 Kia Sorento powertrain problems
severe Owners of the 2017 Kia Sorento have filed 35 NHTSA complaints about the powertrain, typically surfacing around 72,000 miles at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Failure mileage
Complaints
35
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2013 Sorento | 61 |
| 2014 Sorento | 63 |
| 2015 Sorento | 34 |
| 2016 Sorento | 122 |
| 2017 Sorento (this page) | 35 |
| 2018 Sorento | 8 |
| 2019 Sorento | 47 |
| 2020 Sorento | 17 |
1fire
1injury
When does it fail?
Of the 35 powertrain complaints filed for the 2017 Kia Sorento, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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 35 powertrain 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.
No new NHTSA powertrain complaint has been filed on this vehicle in over 8 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain 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 bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced.
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: SERVICE ACTION: INHIBITOR SWITCH REPLACEMENT (SA317B/C) - 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 the procedure to replace the inhibitor switch on some 2017MY Optima (JFa), Sorento (UMa), Optima Hybrid (HEV), Optima Plug-in Hybrid (PHEV), Sportage (QL), Forte (YD), and Sedona (YP), and some 2016-2017MY Optima (JF) vehicles, equipped with a front wheel drive 6-speed transmission, which may experience the concerns listed below. These concerns may be due to the inhibitor switch not allowing the correct gear position signal to be sent
full bulletin at NHTSA ↗PITSTOP: AWD SYSTEM CONCERN DUE TO TIRE CIRCUMFERENCE - This Pitstop provides information regarding potential concerns with the All-Wheel-Drive (AWD) system due to tire sizes of differing circumference. Some customers may complain of a chatter sensation felt in the drivetrain of the vehicle and/or the failure of drivetrain component(s). A difference in tire size (width, aspect ratio, construction, rim diameter etc.) may be the cause.
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: SERVICE ACTION: INHIBITOR SWITCH REPLACEMENT (SA317B/C) - 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 the procedure to replace the inhibitor switch on some 2017MY Optima (JFa), Sorento (UMa), Optima Hybrid (HEV), Optima Plug-in Hybrid (PHEV), Sportage (QL), Forte (YD), and Sedona (YP), and some 2016-2017MY Optima (JF) vehicles, equipped with a front wheel drive 6-speed transmission, which may experience the concerns listed below. These concerns may be due to the inhibitor switch not allowing the correct gear position signal to be sent
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2017 Kia Sorentos document a troubling pattern of engine and powertrain failures. The most common complaint is excessive oil consumption—some vehicles burn a quart every 200 to 500 miles despite no visible leaks—followed by sudden engine seizure or catastrophic failure, often with no warning lights or only a check-engine light that appears after the damage is done. One owner's engine developed a hole the size of a pop can; others report carbon buildup, bearing failure, and connecting-rod damage.
Transmission problems also dominate these narratives: owners describe extremely rough shifting between gears, jerking during acceleration, and gear shifters stuck in Park—some requiring manual screwdriver insertion into the shift lock release to get moving. One owner experienced sudden uncontrolled acceleration five times, where pressing the brake did nothing and only turning off the ignition stopped the vehicle.
Power loss while driving at highway speed has happened to multiple owners, with some losing steering and brakes at 70 mph. An oil pressure switch leak, stuck shifters, and a rear differential coupling assembly leak round out the mechanical failures reported.
Dealership diagnostics frequently fail to pinpoint the problem—many find "no issue" even after the owner reports multiple incidents. Kia's response has been inconsistent: some owners mention a Product Improvement Campaign with a software update (KSDS), but it is not a full recall. Warranty denials are common, even when symptoms began within the warranty period. Owners note they were unaware of prior recalls or campaigns because notification letters either were not received or were too vague to convey the seriousness of the known defect.
Same Kia Sorento powertrain reports on nearby years: 2014 · 2015 · 2016 · 2019 · 2020
Failure modes owners describe
Excessive oil consumption and engine failure
Engine consumes abnormally high amounts of oil—sometimes a quart per 500 miles or more—and then suffers catastrophic failure, often with no warning lights until it's too late. Owners report burnt or seized engines; some describe carbon buildup, bearing failures, or connecting-rod damage. The THETA II GDI engine is specifically mentioned as having a documented history of these failures.
When: Varies widely: some owners notice excessive consumption starting around 90k miles; failures occur anywhere from 73k to 127k miles. One owner experienced failure at 73k despite an oil change 1000 miles prior.
Symptoms owners cite: Oil level drops rapidly (1 qt per 500–200 miles); Engine knocking or loud rattling noise; Oil light flashing or coming on (sometimes only after oil is already gone); Check engine light (sometimes only after failure); Engine hesitation or abnormal performance; Engine seizure or sudden loss of power while driving; Smoke from under hood
Codes mentioned: P0011 or similar camshaft position codes (in one case), No compression in cylinders (one owner's experience)
Repairs/costs cited: Requires full engine replacement. Costs not consistently reported, but one owner cited $800 in diagnostic testing and oil changes. Dealerships often refuse warranty coverage if the engine has 'failed' even if symptoms began during warranty period. One owner faced $10k repair estimate.
Recalls/TSBs owners mention: Kia issued a Product Improvement Campaign (PI1802) for THETA II engines with a knock-sensor detection system (KSDS) software update, but it is not a recall. Kia claims excessive oil consumption over 1 quart per 1000 miles is normal. Warranty coverage denied in multiple cases. One owner mentioned a previous lawsuit settlement with lifetime warranty/engine replacement for first owners, but subsequent owners were excluded.
Sudden unintended acceleration
Vehicle suddenly accelerates at high power and high RPM without driver input, even when brakes are applied or the vehicle is in Park. Only turning off the ignition stops it. One owner reported this occurred five times with the same passenger present; dealership diagnostic multi-point inspection found no verifiable problem.
When: One detailed account: first incident around 54k miles (October 2018), second incident at 56.5k miles (November 2018). Same driver reported five occurrences total.
Symptoms owners cite: Sudden high-power engine revving and acceleration; Vibration felt through foot/pedal; Gear shifting detected before acceleration begins; Acceleration continues even when brake pedal is pressed hard; Acceleration continues even when gear is placed in Park; Only turning ignition off stops the acceleration
Repairs/costs cited: Dealership performed 2-week tech test drive unable to replicate. Service manager suggested the customer's aftermarket OBD reader/GPS unit might be involved and recommended not using it.
Transmission shifting problems (hard shifts, jerking, slipping, stuck in park)
Multiple transmission issues reported: hard or extremely rough shifting, hesitation/jerking during acceleration, transmission slipping, and gear shifter getting stuck in Park. Some owners report no warning lights; dealerships often diagnose need for transmission replacement or TCM software update.
When: Failures occur across wide mileage range: 3.5k miles (inhibitor switch), 94k miles (shifter stuck), 102k–141k miles (rough shifting, jerking).
Symptoms owners cite: Extremely rough or hard shifting (especially first to second gear); Jerking during acceleration (causes neck and back tension in one report); Transmission slips while accelerating; Transmission hesitation; Abnormal ticking noise from engine/drivetrain; Gear shifter stuck in Park; requires manual override button depression or screwdriver insertion; Gear shifter stuck and unresponsive after parking; Brake pedal does not release shift lock (new brake light switch did not correct)
Codes mentioned: Inhibitor switch failure identified in one case
Repairs/costs cited: Dealership diagnoses ranging from brake light switch replacement ($0–minimal cost for switch alone, but ineffective in one case) to full transmission replacement (cost not specified). One dealer identified missing required software update (TCM update) as cause but could not perform it without notice from manufacturer.
Recalls/TSBs owners mention: Kia issued an unknown Technical Service Bulletin regarding the inhibitor switch (mentioned in one complaint). Manufacturer referred one customer to NHTSA Hotline for assistance. One owner reports dealership says they cannot update TCM without a notice.
Engine fire
One owner experienced engine fire after 650 miles, with engine rattling and dying, followed by smoke and fire under the hood that consumed the front two-thirds of the vehicle.
When: 650 miles on the vehicle (early in ownership)
Symptoms owners cite: Engine rattle; Engine dies; Smoke from under hood; Fire starts under engine, spreads to front two-thirds of vehicle
Repairs/costs cited: Vehicle was towed; fire department extinguished fire. No repair attempted or possible.
Oil pressure switch leak
Oil pressure switch leaks and spews oil all over engine; owner thought it was just a sensor issue initially, but repair was more extensive.
When: 84k miles on vehicle (well-maintained)
Symptoms owners cite: Oil light comes on and blinks; Oil light remains on even though oil level is full (indicates sensor/switch issue); Oil visible pooling under car in garage; Oil leaking and spewing over engine
Repairs/costs cited: Oil pressure switch replacement required. Dealership initially misdiagnosed as sensor needing replacement; took 6 weeks total (4 weeks waiting for part, 2 more weeks for actual repair after ordering additional parts). Cost: $1,750. Not covered under warranty.
Power loss and electrical/warning light failures
Vehicle loses power while driving on highway or freeway, sometimes with flashing check engine light or no warning lights at all until power is lost. In one case, all lights went on and off before shutdown.
When: Mileage varies: 30k miles (one account of repeated power loss), 73k–133k miles (single power-loss events).
Symptoms owners cite: Sudden loss of power while driving at highway speed; All lights go on and off, vehicle shakes before shutdown; Loss of steering and power brakes; Flashing check engine light (or check engine light appears only after failure); No warning lights before failure in some cases; Engine rattling before power loss; Low oil pressure or low oil light (sometimes only after all oil has leaked out)
Repairs/costs cited: Dealerships unable to replicate or diagnose in some cases (no issue found). One owner's engine analysis showed hole in engine block (described as 'pop can size').
Gear shifter mechanical failure and park override malfunction
Gear shifter stuck in Park and unable to move; manual shift override (pressing button or inserting screwdriver into shift lock release) becomes the only way to release shifter. Issue persists across multiple trips and repair attempts.
When: Occurs at various mileages: 3.5k (inhibitor switch), 94k (unknown part failure), 160k+ miles (ongoing as of report date).
Symptoms owners cite: Gear shifter will not move out of Park; Shifter requires manual depression of override button or screwdriver insertion into shift lock release hole; No warning lights in most cases; Issue persists or recurs after initial repair attempt
Repairs/costs cited: One owner manually inserted screwdriver into shift lock release hole and has used that method repeatedly since September 2022. Dealership appointment scheduled but repair status unknown. Another owner replaced brake light switch, but issue persisted (indicates brake interlock may be faulty but switch is not the root cause).
Recalls/TSBs owners mention: One dealer diagnosed inhibitor switch as cause and mentioned an unknown TSB; vehicle was repaired after second occurrence.
Rear differential coupling assembly leak
Four-wheel drive rear differential coupling assembly leaks oil, covering the rear differential actuator motor; accompanied by loud noises from rear during braking and operation.
When: Mileage not specified in complaints
Symptoms owners cite: Oil leak from 4WD coupling assembly; Oil covering rear differential actuator motor; Loud noises from rear of vehicle, especially during braking
Repairs/costs cited: Coupling assembly requires replacement. Brakes still have 5–7 mm remaining (not the root issue).
Recalls/TSBs owners mention: Kia Technical Service Bulletin #086 (November 2019) documents this issue.
Synthesized from 35 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Vehicle was parked, and running, on sloped driveway. My wife, who had exited the car, returned to turn the car off. She opened the door and turned the car off. The car then began rolling down the driveway. The car door was still open and my wife ended up running backwards with the car, which went into a street and hit a curb. The door hit my my wife in the head causing her to fall. She…
Had powertrain trouble with your 2017 Kia Sorento?
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 powertrain problem on the 2017 Kia Sorento?
It's a meaningful issue. 35 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 9 complaints that reported odometer mileage, most powertrain failures cluster between 30,000 and 102,000 miles, with the median around 72,000. A quarter of owners report trouble before 30,000; a quarter make it past 102,000. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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/2017/Kia/Sorento.
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.