2012 Kia Soul engine problems

Connecting rods fail suddenly, puncture or blow holes through the engine block, causing complete engine shutdown. Often occurs without warning during highway driving.

When: Random; reported between 77,000 and 172,000 miles, with some failures occurring shortly after recall notification

Symptoms owners cite: Loud explosive noise from engine; Loss of power while accelerating; Engine shaking and inability to accelerate; Check engine light (may appear moments before failure); Burning smell through vents; Complete engine shutdown; vehicle will not restart

Codes mentioned: P0300 - Random/multiple cylinder misfire, P0303 - Cylinder #3 misfire

Repairs/costs cited: Connecting rod failure blows holes through engine block; requires complete engine replacement. Dealers have quoted $5,500–$7,000 for replacement; some owners cite repair costs of $4,100 and higher. Rod blow-through causes total oil drain from pan.

Recalls/TSBs owners mention: NHTSA Recall 19V120000 addresses engine damage from abnormal combustion related to catalytic converter overheating (1.6L GDI engines, 2012–2016 Souls). Kia has denied many claims, citing warranty expiration or claiming the failure falls outside recall scope despite matching described defects. Recall promised engine replacement at no cost if damaged, but Kia has refused repairs or demanded owner pay despite recall notification.

Engine burns or loses oil at alarming rates despite regular oil changes. Caused by faulty seals around pistons or piston ring sticking from carbon buildup. Consumption rates reported as high as 1+ quart per 1,000 miles.

When: Often emerges between 58,000 and 120,000 miles; can occur early (within months) or recur after engine replacement

Symptoms owners cite: Check engine light (intermittent or persistent); Oil level drops significantly between service intervals; Engine knocking or ticking noise; Engine running rough, hesitating, misfiring; Loss of power under acceleration; Excessive fuel and oil consumption

Codes mentioned: P0300 - Random misfire, P0420 - Low catalyst system efficiency

Repairs/costs cited: Mechanics diagnose faulty piston seals or sticking piston rings; requires engine overhaul or replacement. Dealers have recommended adding oil every few thousand miles as temporary measure. Kia denied claims citing poor fuel quality or lack of maintenance records (despite regular servicing).

Recalls/TSBs owners mention: Warranty claims initially accepted but then denied if vehicle ages beyond coverage period. Kia refuses to cover under recall unless engine seizes while driving. No TSB or recall issued specifically for oil consumption despite widespread reports and Korean government testing confirming the issue.

Engine unexpectedly stalls or loses power at traffic lights, during acceleration, or while maintaining highway speed. Vehicle may restart after sitting briefly or may require towing. No warning lights precede many failures.

When: Reported at various mileages from early ownership (600 miles post-purchase) through 190,000+ miles; multiple repeated stalls in short timeframes not uncommon

Symptoms owners cite: Sudden engine stall without warning lights; Loss of motive power while driving; Engine jerking or hesitation before stall; Inability to accelerate beyond 5 mph in some cases; Check engine light (sometimes flashing, sometimes absent); Vehicle may or may not restart; repeated stalls over short driving periods

Codes mentioned: P0335 - Crankshaft position sensor circuit, No codes or warning lights in many cases

Repairs/costs cited: Dealers have misdiagnosed as loose connections, bad spark plugs, catalytic converter failure, crankshaft sensor, ESC sensors, or high-pressure fuel sensor. Multiple repair attempts often unsuccessful. In some cases, dealership cannot identify root cause after extensive diagnostics (9.5 hours reported).

Recalls/TSBs owners mention: Most vehicles outside recall scope or VIN not listed. Kia declined recall repair in at least one case (2.0L engine, not 1.6L). No clear guidance provided to dealers or owners; some told to keep driving and add oil.

Hole ruptures in engine block allowing oil to escape and ignite on contact with heated exhaust components. Fire originates in engine compartment, often at exhaust manifold. Fire can occur without prior warning.

When: Reported at approximately 105,000–127,000 miles; no warning signs in some cases

Symptoms owners cite: Loud knocking or abnormal noise from engine; Blue or gray smoke from rear or engine compartment; Engine compartment fire; Oil everywhere in engine compartment and on road surface; Hole visibly burst through piston or engine block

Repairs/costs cited: Fire extinguished by fire department; vehicle destroyed or totaled at scene. Engine rod blown through block confirmed by post-fire inspection.

Recalls/TSBs owners mention: Manufacturer not notified in at least one case. Kia pointed owners toward class action lawsuits but denied any recall coverage or responsibility, claiming VIN had no recalls despite obvious engine defect.

Catalytic converter overheats due to abnormal combustion, fails, and causes piston and connecting rod damage. Can lead to engine stall, loss of power, and catastrophic engine failure if not addressed.

When: Failures reported at 80,000–189,000 miles; recall service (COP ECU logic upgrade) performed in 2019, but converters and engines still failed years later

Symptoms owners cite: Check engine light with P0420 code (low catalyst efficiency); Hesitation, misfiring, loss of power; Knocking or ticking from engine; Engine running rough, stalling; Blue or gray smoke from exhaust; Engine consuming excessive oil

Codes mentioned: P0420 - Low catalyst system efficiency, P0300 - Random misfire, P0303 - Cylinder #3 misfire

Repairs/costs cited: Catalytic converter replacement cost typically $1,600–$2,200 at dealership. Owners have had to replace converters 2–3 times in succession. After recall software update, converters still failed and caused secondary engine damage. Spark plug replacement attempted but did not resolve issue.

Recalls/TSBs owners mention: NHTSA Recall 19V120000 specifies catalytic converter replacement and engine assessment/repair at no cost. However, Kia has denied claims stating recall does not apply if vehicle is out of warranty, or if specific diagnostic codes (e.g., P0420) do not appear despite matching symptoms. Kia initially promised free replacement per recall letter but then demanded out-of-pocket payment ($4,100+). Follow-up repairs for secondary damage (spark plugs, fuel pump, high-pressure sensor) have been denied as outside recall scope.

Knock sensor or crankshaft position sensor fails, triggering check engine light. Replacements are ineffective, and underlying engine damage (bent rod bearings, knocking) develops or persists even after sensor replacement.

When: Reported at 58,000–241,436 miles; knock sensor replacement did not stop knocking; crank sensor replacement halted odd running but engine still stalls on occasion

Symptoms owners cite: Light engine hesitation and knocking; Check engine light; Engine stalling at stops and while driving; Engine running rough and losing power; Continued knocking after sensor replacement; Persistent oil consumption after 241,000 miles

Codes mentioned: Knock sensor bad (replaced twice in one case), Crank sensor fault

Repairs/costs cited: Knock sensor replaced twice without success; crank sensor replaced once and stopped odd running but knocking persisted. Dealers recommended engine flush and, if unsuccessful, full engine replacement at owner's cost. One owner with 241,436 miles still experiencing knock after sensor replacements despite catalytic converter recall completion.

Recalls/TSBs owners mention: After catalytic converter recall completed, dealer told owner to get engine flushed or replace engine at own cost. No warranty coverage extended beyond initial repair attempt.

Carbon deposits accumulate on piston crowns; piston rings stick, preventing proper oil sealing. Engine oil and fuel consumption both elevated. Induction cleaning or engine overhaul needed.

When: Reported at approximately 85,000 miles in one detailed case

Symptoms owners cite: Engine knocking or noise; Oil level drops rapidly despite regular oil changes; Fuel consumption also elevated; Engine losing power

Repairs/costs cited: Dealership performed induction test, diagnosed carbon buildup and stuck rings, recommended new engine. Owner changed oil intervals from 7,500 miles back to 3,000 miles due to significant oil loss but problem persisted.

Recalls/TSBs owners mention: Kia denied warranty claim citing 'poor fuel and lack of maintenance records.' No TSB or recall issued despite diagnosis pointing to engine defect.

Vehicle struggles to start or fails to start entirely. No check engine light or diagnostic codes present in some cases; battery tests good; vehicle may start briefly then die again, or start only after extended rest.

When: Reported 1 month after purchase (600 miles) and at various mileages; some new vehicles exhibit problem almost immediately

Symptoms owners cite: Vehicle will not turn over or cranks but does not start; Multiple failed start attempts in short succession; Stalls shortly after starting; No check engine light or diagnostic codes; Battery is functional

Repairs/costs cited: Dealership diagnostics inconclusive; attributed to 'loose connections' or other vague issues without identifying root cause. One new vehicle (purchased 1 month prior, 600 miles) required multiple towing and service visits without resolution.

Recalls/TSBs owners mention: Dealership sent experienced technicians but could not identify issue. Some vehicles eventually replaced under dealer agreement (e.g., 2012 Soul replaced with 2013 model) rather than repaired.

Vehicle exhibits failure symptoms matching NHTSA Recall 19V120000 (abnormal combustion, piston/rod damage, engine stall, fire), but VIN is not listed in recall database. Owner denied coverage and directed to pay for repairs.

When: Failures at 77,000–222,000 miles after recall issued April 2019

Symptoms owners cite: Engine power loss, stalling, knocking, fire; Symptoms identical to recalled vehicles; Diagnostic codes (P0300, P0303) match recall criteria

Codes mentioned: P0300 - Random misfire, P0303 - Cylinder #3 misfire, P0420 - Catalyst efficiency

Repairs/costs cited: Owners request VIN be included in recall or repair costs reimbursed. Engine replacement quotes $5,500–$7,000. One owner cited rod blow-through hole clearly visible in engine block, matching recall description.

Recalls/TSBs owners mention: Kia stated VIN not in recall and declined to perform repair. Owners appealed to NHTSA arguing their vehicles exhibit identical defects and consequences as recalled vehicles but were denied inclusion. No written explanation provided by Kia for VIN exclusion despite matching failure pattern.