2020 Hyundai Santa Fe: engine failure

Filed Sep 23, 2026 · Engine · NY

Codes P0172 and P016B. Oil has fuel in it due to high pressure fuel pump leaking. Possible premature engine failure or fire. This is a 2020 santa fe limited 2.0T.

Filed Sep 10, 2026 · Engine · IL

At approximately 122,000 miles, my 2020 Hyundai Santa Fe experienced a serious engine malfunction while I was driving on the highway. The check engine light suddenly illuminated and the vehicle began thrusting/jerking forward unexpectedly. We immediately took action to exit the highway and were able to get off the highway, but the engine died before we could fully stop the vehicle. This created a serious safety risk because the unexpected jerking and subsequent loss of engine power occurred while traveling at highway speeds and could have resulted in loss of control or a collision. The vehicle was towed to a local independent mechanic. After inspecting it, the mechanic stated that the engine needed to be replaced and recommended taking it to a Hyundai dealership because of the continuing issues associated with the Theta II engine. The vehicle was then towed to the Hyundai dealership. The Hyundai dealership inspected the vehicle and determined that cylinders 2 and 4 were not firing and recommended replacing the valve shaft. We requested a complete engine replacement. Hyundai initially offered a 50/50 split of the repair cost, but after we requested an engine replacement, Hyundai declined and instead offered a 70/30 cost split. There was also a previous documented concern regarding increased oil consumption, as noted in an earlier oil-consumption report. The vehicle has been inspected by both an independent mechanic and a Hyundai dealership. The vehicle and engine components are available for inspection upon request. No police or insurance inspection was performed, to my knowledge.

Filed Apr 21, 2026 · Engine · MI

We purchased a used 2020 Hyundai Santa Fe with approximately 105,000 miles. The vehicle has had regular routine maintenance and oil changes. Around 107,000 miles, the check engine light came on and the vehicle simultaneously started running rough. It was diagnosed with a failed valve on the #3 cylinder and now needs a total engine replacement. This issue also coincided with excess oil consumption. Despite having an oil change fewer than 2000 miles earlier, the oil was almost completely gone from the engine despite not having any leaks present. This goes well beyond normal wear and tear and is indicative of a defect/design flaw.

Filed Apr 20, 2026 · Engine · MI

The vehicle (2020 Hyundai Santa Fe, 2.0T, ~88,500 miles) experienced a sudden engine failure with no warning signs—no oil light, knocking, or overheating. After sitting overnight, the vehicle would not start and was later diagnosed by an independent repair facility as having a seized engine requiring replacement. The failure was unexpected and creates a potential safety risk, as it could have resulted in a loss of power while driving. The manufacturer has been notified but denied warranty assistance due to lack of maintenance documentation. The vehicle is currently available for inspection.

Filed Apr 16, 2026 · Engine · TX

Around Feb 15, 2026, at ~85,000 miles, the oil pressure warning light began illuminating at idle and extinguishing above idle speed. The vehicle had also been experiencing intermittent hard starts and occasional shuddering at idle — symptoms too subtle for a typical owner to connect to imminent engine failure. An independent mechanic performed a manual oil pressure test: 4 PSI (Hyundai minimum spec is 13 PSI). The authorized dealer confirmed 6 PSI and found metal shavings in the oil pan — the signature of connecting rod bearing wear documented in Theta II GDI engine failures. Dealer recommended full engine replacement ($8,500). Vehicle has been inoperable at the dealer since Feb 19, 2026. SAFETY CONCERN: At 4 PSI with metal debris in the oil system, this engine was at imminent risk of catastrophic seizure. I avoided highway driving after the warning appeared (max 50 mph, city streets only). Had the engine seized at highway speed, loss of power steering and brake vacuum assist would have created serious crash risk. The symptom profile — warning only at idle, clearing at speed, no knocking, no check engine light — is the pattern that puts less-vigilant drivers at risk of seizure at highway speed with no warning. KNOWN DEFECT: The 2.4L G4KJ Theta II GDI is identical to the engine subject to a $210M the federal safety agency civil penalty (2020), multiple recalls, and a ~$1.3B class action settlement extending lifetime warranties through MY 2019. The 2020 uses the same engine but was excluded. My failure mode is textbook Theta II. Hyundai Service Campaign 9C2 (ECU update for 2019-2020 Theta II, issued Nov 2025) was incomplete on this vehicle — I was never notified. Completed after the engine had already failed. Manufacturer denied coverage (Case #XXX). BBB AUTO LINE claim #XXX filed Apr 16, 2026. No crash. No injuries. No fire. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Feb 23, 2026 · Engine · IL

Our vehicle has encountered a catastrophic engine failure (burnt valves) due to a known and ongoing issue with the piston rings install in this engine.

Filed Feb 6, 2026 · Brakes, Engine · PA

While driving, the engine catastrophically failed without warning, causing an immediate loss of power-assisted braking and steering. The failure occurred while traveling downhill. I was unable to slow or control the vehicle properly and was forced to proceed through a school bus’s flashing lights to avoid a potentially catastrophic collision, resulting in a traffic citation. My son was in the vehicle at the time. A sudden loss of engine power, braking assist, and steering assist while driving presents a serious safety defect. Vehicle was towed to Fred Beans Hyundai in Doylestown where it has been confirmed engine failure. This failure happened immediately and without warning.

Filed Jan 18, 2026 · Engine · OR

Excessive oil burn off. Oil is getting into the cylinder, causing scorching. This causing engine failure.

Filed Dec 29, 2025 · Engine · MS

After 110,000, the engine started using oil and it began to knock. According to the history of these engines, it will lead to engine failure. They have a record of being a lemon engine and there is not a engine of this type that this does not happen. The engine needs to recalled and replaced, They are the Theda II GDI series of 2.0L and 2.4L four-cylinder engines from Hyundai/Kia.

Filed Dec 18, 2025 · Engine · PA

My engine has been sucking up oil since the day I bought it. Once I hit 100k miles it started sucking up oil faster than the recommended oil changes. I was driving home two weeks ago. I went to get in a major highway and she would not go past 35 mph. I went to trade it in and was told it needs a new engine and a new turbo. This is a known problem and Hyundai will not fix it. This car is not even 4 years old. I got it in April 2021

Filed Sep 27, 2025 · Engine · OH

On [XXX}, my 2020 Hyundai Santa Fe SEL 2.0T (VIN: [XXX] ) experienced sudden complete engine failure accompanied by a strong burning smell. The vehicle would not start or turn over, stranding me and creating a safety hazard. The burning smell indicated potential fire risk. This appears to be related to the known Theta II engine defect that has caused multiple recalls and engine fires in Hyundai vehicles. Despite dealer confirmation that the engine was clean and well-maintained with no customer fault, Hyundai has denied warranty coverage. The sudden failure pattern with burning odor represents a serious safety defect that could endanger drivers and passengers. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 25, 2024 · Engine · NC

While driving down the highway my car started slowing down and would not accelerate. All the lights came up on the dash board and would not let me accelerate. I had to merge 2 lanes to the shoulder on a busy highway where my car ended up dying and would not turn over. I was concerned for my safety and the speed limit was 70MPH and my car rapidly went down. After 5 minutes my car came back on and then immediately stopped working again. I had my car towed to the local Hyundai dealer where they said I would need a new engine on a 4 year old car. My make and model are in the recall for engine issues but my VIN # was not included. I spoke to Hyundai a few times and they stated there was nothing they can do and we needed to pay for the new engine.