Owners describe a 2015 Soul plagued by catalytic converter failure—sometimes within 3–4 years of the recall service itself. One converter broke into pieces that entered the engine; another owner paid $2,800 out-of-pocket when the dealership refused recall coverage, claiming the prior repair was marked "done" even though no work had been performed. A second owner believes a step in the recall replacement was missed, specifically ECU logic for overheating protection.
Acceleration issues dominate reports. Owners experience sudden power loss on highways at 55–60 mph, leaving them stranded in traffic. Some describe engine hesitation or "hiccups" when stepping on the gas, especially during passing. The accelerator pedal itself catches at multiple points or engages unintentionally; one owner reports a parking-lot incident where the vehicle suddenly accelerated into a concrete pillar.
Engine oil is a persistent headache. Multiple owners report abnormal consumption requiring frequent top-ups, oil leaking from seals and hoses, and engines smoking and overheating despite no low-oil warning light. One owner's engine got so hot and depleted during a half-hour highway drive that it smoked when opened.
Dealership responsiveness is poor. Owners report diagnostic fees, refusals to acknowledge incomplete recalls, requests to wait months for service, and being told to pay for further diagnostics when the vehicle is already under recall investigation. One owner's vehicle sat at the dealership for two weeks with no answers.
Failure modes owners describe
Catalytic Converter Failure
Catalytic converter overheating, breaking apart, or failing structurally. Several owners report converter failure within 4–7 years of ownership or shortly after recall service. One owner's converter deteriorated so severely that pieces entered the engine and fuel line, requiring engine flush and replacement. Owners allege incomplete recall work may have contributed to premature failure.
When: 90,000 to 130,000 miles; failures occurring 3–4 years after SC176 recall completion and within 7 years of ownership
Symptoms owners cite: Vehicle stalling and shaking on highway; Hard acceleration, loud noise; Engine overheating and smoking; Ticking sound on acceleration; Service engine light illuminated; Burnt oil smell; High catalytic converter temperature codes
Codes mentioned: SC176 recall (catalytic converter overheating protection), High catalytic converter temperature fault codes
Repairs/costs cited: Replacement catalytic converter; owner cited repair cost over $2,800 at dealership. One owner had to pay out-of-pocket after dealer denied recall coverage due to warranty expiration and notation that prior recall work was marked 'done' despite no parts replacement having occurred.
Recalls/TSBs owners mention: NHTSA Campaign SC176 (catalytic converter overheating protection). Multiple owners report dealership denials of recall coverage citing expired warranty or prior recall notation, despite evidence that repair may not have been completed. Recall described in narrative #2 as potentially missing Catalytic Overheating Protection ECU logic step.
Accelerator Pedal Design & Catch
Accelerator pedal positioned low and forward with soft electronic throttle sensitivity, causing unintended engagement or catching at multiple points when depressed. One owner reported the pedal appears bent and catches at three distinct points when pressed halfway or deeper. Design places pedal too close to brake pedal, limiting safe foot rest position.
When: Throughout ownership; no specific mileage noted
Symptoms owners cite: Accelerator pedal catches at distinct points during depression; Unintended slight acceleration when shifting foot position in Park; Pedal appears bent or malpositioned; Insufficient space between brake and accelerator pedals
Codes mentioned: NHTSA 15V123000, Kia SC116
Repairs/costs cited: One owner reported dealership demanded $130 diagnostic fee with no guarantee of repair coverage. No repair costs provided by other owners.
Recalls/TSBs owners mention: NHTSA Campaign 15V123000 (Vehicle Speed Control) and Kia SC116 apply to 2014–2015 Kia Souls manufactured until January 8, 2015. Dealership and Kia customer service refused to acknowledge or service recall on a post-cutoff 2015 model. One owner reported recall marked incomplete on VIN check.
Loss of Acceleration / Power Loss While Driving
Engine loses power or refuses to accelerate while vehicle is moving, most commonly at highway speeds or during traffic merging. Vehicle may slow unexpectedly, stall, or become unresponsive to throttle input. In one case, loss of power occurred in middle of busy road, creating acute safety hazard. No warning lights in some instances before failure.
When: At 55 mph highway speeds and higher; one incident at 90,000 miles; occurs across various mileages
Symptoms owners cite: Sudden loss of acceleration response; Vehicle speed decreasing despite throttle input; Engine stalling mid-drive; Sluggish acceleration on highway at high speeds; Vehicle came to complete stop in traffic; Engine light may or may not illuminate
Codes mentioned: Engine light (check engine)
Repairs/costs cited: Diagnostics performed but repairs not completed in some cases. No specific repair costs cited.
Engine Oil Depletion & Leaks
Engine consuming oil at abnormal rate or leaking oil from seals and flex hose connections. Multiple owners report needing frequent oil top-ups and discovering engine smoking and overheating due to low oil. One owner's engine was so depleted it was smoking and extremely hot during highway drive, yet low-oil warning light did not illuminate.
When: Occurs throughout ownership; one incident at 30 minutes into a 1-hour commute
Symptoms owners cite: Engine smoking and overheating; Oil consumption between service intervals; Oil leaking from seals and flex hose; Engine extremely hot to touch; Check oil light may or may not illuminate despite critical low levels; Gas/burnt oil smell
Repairs/costs cited: One owner replaced PCV valve in attempt to resolve issue. Repairs mentioned include seal and flex hose replacement. Owner cited needing frequent oil top-ups.
Unintended Acceleration / Loss of Brake Control
Vehicle suddenly accelerates without driver input while foot was on brake pedal. One owner experienced sudden acceleration while in Park mode attempting to park, resulting in collision with concrete pillar. Dealership could not duplicate or diagnose root cause.
When: One incident while parking in B (Brake/low) mode
Symptoms owners cite: Sudden acceleration while foot on brake; Vehicle crashed into fixed object; No warning lights prior to incident
Repairs/costs cited: Owner drove vehicle home; later towed to dealer. Dealer unable to identify or repair cause.
Engine Hesitation / Hiccup Under Acceleration
Engine skips, hiccups, or hesitates when accelerator pedal is depressed, particularly when pressing pedal past halfway point or during passing maneuvers. Check engine light illuminates.
When: After approximately 3 months of ownership; occurs during routine and aggressive acceleration
Symptoms owners cite: Engine skip or hiccup sensation when depressing gas pedal; Hesitation during acceleration, especially when passing; Check engine light illuminates; Requires slow acceleration to avoid symptom
Codes mentioned: Check engine light
Vehicle Stalling & Rough Idle
Engine stalls at traffic lights, during highway acceleration near 60 mph, or unexpectedly during normal driving. Vehicle shakes and vibrates, especially at idle or low speeds. Some reports include engine running rough and requiring frequent restarts.
When: At low speeds, idle at traffic lights, highway speeds above 60 mph; one owner at 1 hour into drive
Symptoms owners cite: Engine stalling at traffic light; Stalling when accelerating on highway; Vehicle shaking and vibrating; Rough idle; Engine ready to shake and stop
Codes mentioned: Engine light
Cruise Control Malfunction
Cruise control system malfunctions or cannot be engaged. One owner reports cruise control cannot be used for extended periods due to vehicle instability or engine behavior.
When: Throughout ownership
Symptoms owners cite: Unable to hold cruise control for extended duration; Vehicle unstable when attempting cruise control
Excessive Fuel Consumption
Vehicle consuming fuel at abnormally high rate, particularly during highway acceleration at high RPMs. Owner reports fuel consumption concern concurrent with transmission shift issues.
When: During highway driving at high speeds and RPMs
Symptoms owners cite: Very large amount of fuel consumption; High RPM operation during gear shifts; Excessive fuel burn during highway acceleration
Check Engine & ABS Warning Lights
Engine light and ABS light remain on continuously or repeatedly illuminate without clear diagnosis or resolution. Dealers unable or unwilling to diagnose root cause or explain issue to owner.
When: Ongoing; one case 2+ weeks at dealership without resolution
Symptoms owners cite: Engine light stays on; ABS light stays on; Lights return after being cleared
Codes mentioned: Check engine light, ABS light
Repairs/costs cited: Owner asked to pay for additional diagnostics; dealership kept vehicle 2 weeks without resolution.
Recalls/TSBs owners mention: Kia dealership declined to explain issue or take responsibility; advised recall was 'fine.'
Engine Fire
One catastrophic report of vehicle catching fire while being driven on highway with three children in vehicle. Circumstances not detailed.
When: While driving on highway
Symptoms owners cite: Vehicle caught on fire
Synthesized from 18 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.