Kia Sorento 2016–2020Common problems, reliability & repair costs

Symptoms: Metallic knocking or rod knock from the bottom end (often on cold start first), check-engine or oil-pressure light, sudden loss of power, or the engine simply seizing — sometimes while driving. Bearing debris can also lead to non-collision engine fires, which is why NHTSA treated this as a safety issue.

Fix: Full engine (short block) replacement. Kia's KSDS knock-sensor software update detects early bearing wear and derates the engine so you can get it in before it grenades. Under the class-action settlement, 2016–2019 Sorentos with the 2.4L GDI or 2.0T that have the KSDS update carry a lifetime warranty on the short block — so a qualifying failure should cost you nothing at a Kia dealer. The 2020 model year is outside the settlement class. Note: engines replaced under the earlier recall or warranty were later recalled again (SC172) to inspect the high-pressure fuel pipe, which could leak fuel and start a fire if mis-installed during the swap.

Sources: Kia Engine Settlement — official FAQ (covered vehicles, lifetime warranty, KSDS), ClassAction.org — Hyundai/Kia engine failure settlements, CarComplaints — 2016 Kia Sorento engine problems, NHTSA — Kia Sorento recalls and complaints

Symptoms: Oil level drops noticeably between changes — sometimes a quart every 1,000 miles or less — with no visible leak and no blue smoke early on. Owners often discover it only when the oil light comes on.

Fix: This is usually the opening act of the bearing/ring problem above, not a separate disease. Document consumption with dated oil-level photos, then push Kia for an oil-consumption test; cars that fail can qualify for engine replacement under the settlement's lifetime short-block warranty (2016–2019 with KSDS done). Out of pocket, the fix is rings or a replacement engine. In the meantime: check the dipstick every fill-up. Running it low is what kills the bearings.

Sources: CarComplaints — 2017 Kia Sorento engine problems (oil consumption), Kia Engine Settlement — official FAQ

Symptoms: Coolant loss with no obvious external leak, overheating, white smoke from the exhaust, milky oil in bad cases. Often little warning before the temperature spikes.

Fix: Head bolts in the aluminum block could stretch or pull threads, letting the head gasket fail. Kia logged thousands of warranty claims, NHTSA opened an investigation in late 2023, and Kia issued extended-warranty campaign WTY035 covering 2016–2017 Sorento 3.3L engines for 15 years/180,000 miles. Kia deepened the head-bolt thread engagement in production during 2017, and 2018–2020 engines fail at a fraction of the earlier rate. If a 2016–2017 V6 overheats or loses coolant, go to a Kia dealer and cite WTY035 before paying an independent shop for a head-gasket job or used engine.

Sources: Kia Forum — US Sorento 3.3L engine failure / head bolt issue, Valero Law — NHTSA opens investigation into Sorento 3.3L Lambda II, autoevolution — Feds investigate Kia Sorento Lambda II 3.3L power loss

Symptoms: Halogen low beams fail every few months instead of every few years, often one side at a time. In worse cases the bulb connector overheats and the terminals melt.

Fix: A long-running Kia complaint: always-on DRLs plus voltage surge at startup cook the bulbs, and an overheating connector makes it worse. The cheap fix is a quality halogen bulb (a 15-minute DIY — see repairs below). If the socket shows melted plastic, replace the pigtail/connector; Kia's updated harness adds a resistor to the circuit. Inspect the connector any time a bulb fails early.

Sources: ClassAction.org — Kia headlight problems overview, Kia Sorento Forum — headlights keep burning out

Symptoms: The car doesn't track straight on the highway and needs constant small corrections; feels twitchy or vague on-center. Reported from low mileage, so it's not simple wear.

Fix: Start cheap: alignment to the tight end of spec and a check for uneven tire wear. Some owners got relief from dealer steering-software (MDPS) recalibration; a minority ended up in steering couplers or, rarely, a rack. Drive any UM Sorento at 65+ mph before buying and judge for yourself — some cars have it, many don't.

Sources: CarComplaints — 2017 Kia Sorento steering complaints

Tools: Nitrile gloves (don't touch halogen glass bare-handed), Flashlight

1. Open the hood and locate the round dust cap on the back of the headlight housing; on the driver's side you may need to nudge intake ducting aside for hand room.
2. Twist off the dust cap, unplug the connector, and release the bulb (twist-lock on these housings).
3. Inspect the connector closely — browned, melted, or brittle plastic means the pigtail should be replaced, not just the bulb.
4. Install the new bulb with gloves on, seat it fully, reconnect, and refit the dust cap.
5. Test low beams, high beams, and DRLs before closing the hood.

Tools: Floor jack + jack stands or ramps, Oil drain pan, Socket set (17mm drain plug), Oil filter wrench, Funnel

1. Warm the engine briefly, raise the front of the vehicle securely, and place the drain pan under the plug.
2. Remove the drain plug, drain fully, and reinstall with a new crush washer, snug — don't gorilla it.
3. Replace the oil filter, lightly oiling the new gasket first.
4. Refill with the spec amount of 5W-30 (2.4L takes about 5 quarts; V6 about 5.5–6), then check the dipstick.
5. Start the engine, check for leaks, re-check the level after it sits.
6. On any Theta II car: photograph the dipstick with a dated phone photo now and at every fill-up. That log is your evidence if you ever need Kia to honor an oil-consumption claim.

Tools: None (hands only; maybe a screwdriver for the airbox clips)

1. Open the glovebox, unhook the damper arm, squeeze the side stops to drop it, and pull the cabin filter cover.
2. Slide out the old cabin filter and insert the new one with the airflow arrow pointing the correct way (marked on the housing).
3. For the engine filter, release the airbox clips, swap the panel filter, and re-clip the lid.
4. Reset the glovebox stops and damper arm.