2019 KIA SOUL

Typical onset: 60,000-120,000 mi

Symptoms: Sudden knocking or metallic rattling from engine bay, Check engine light with misfire codes or low oil pressure warning, Metal shavings in oil during changes, Sudden loss of power or complete engine seizure, Engine fires in extreme cases due to connecting rod puncturing block

Fix: This is the Theta II/Nu family bearing debris issue — inadequate machining leaves metal particles that starve rod bearings. Once knocking starts, it's over. Short block replacement is minimum 18-24 labor hours if you can source one; most get remanufactured long blocks or junkyard swaps. Kia extended warranty to 10yr/100k for original owners on some VINs, but secondhand buyers often aren't covered.

Estimated cost: $5,500-8,500

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid puddles under vehicle, typically passenger side, Low transmission fluid warning or limp mode, Pink or red fluid visible near radiator area, Harsh shifting or slipping if fluid level drops significantly

Fix: Cooler lines corrode where they connect to the radiator or at crimp fittings. Replace both lines as a set — one fails, the other is close behind. 2-3 hours labor, includes fluid refill and system purge. Sometimes the external cooler itself weeps; inspect carefully.

Estimated cost: $350-650

Typical onset: 80,000-130,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle, especially with AC on, Visible engine/trans movement when revving in Park, Thumping over bumps that sounds transmission-related

Fix: The lower transmission mount (dogbone-style) tears or collapses. Very common on this platform due to mount design and engine torque. Replacement is straightforward: 1.5 hours including alignment check. OEM mounts last longer than aftermarket in my experience.

Estimated cost: $220-380

Symptoms: Rough idle or stumbling acceleration, Long cranking before engine starts, especially when warm, Check engine light with fuel trim or pressure codes (P0087, P0171, P0174), Loss of power under load or at highway speeds

Fix: Soul fuel systems are sensitive to contaminated gas or debris from aging in-tank pumps. The in-tank filter screen clogs, starving the engine. Requires dropping the tank to access pump assembly. 3-4 hours labor. Sometimes pump itself is failing; test pressure first before just swapping filters. If pump is going, do it all at once.

Estimated cost: $450-950

Typical onset: 90,000-150,000 mi

Symptoms: White smoke from exhaust, especially on cold start, Coolant loss with no visible external leaks, Overheating or erratic temperature gauge readings, Milky oil on dipstick or oil cap, Bubbles in coolant reservoir when engine running

Fix: Not as common as the bearing failures, but the 2.0L Nu can blow head gaskets, particularly if overheated or if the block is already compromised. 12-15 hours labor for both gaskets, includes head resurfacing. Often find warped heads on these. If you're in this deep and the engine has 100k+, seriously consider just swapping the whole engine.

Estimated cost: $2,200-3,800