2023 Hyundai Tucson: check engine light

Filed Oct 1, 2026 · Fuel system · MA

2023 Hyundai Tucson Limited, 2.5L GDI, Alabama-built (VIN 5NMXXXXXXXXXXXXXX), built [XXX]. On [XXX], at about 37,550 miles, the check engine light came on flashing and the engine ran rough while I was traveling in Canada. My scan tool showed P0300, P0302 and P0304 (misfires on cylinders 2 and 4). On July 6, 2026, Experience Hyundai in Charlottetown, PE (service order 92XXX) replaced one ignition coil under warranty. No fuel injector leak test was performed. The misfires returned. On [XXX], at 39,409 miles, my scan showed P0302 active and P0304 pending. The car also had extended cranking after sitting and the check engine light was on. I was told I could keep driving the car unless it started to jerk or engine light started to flash, then immediately stop driving it and have it towed. On September 25, 2026, the car was towed to McGovern Hyundai Route 2, Leominster, MA (invoice 148XXX). The dealer found all 4 fuel injectors leaking and replaced them under warranty with injector service kit 35399-2S133QQH. My vehicle is outside the production range of Hyundai TSBs 23-FL-002H-1 and 26-FL-001H, which cover this injector failure only for Alabama-built Tucsons produced through July 11, 2022. Yet it failed in the same way. I am concerned the defect extends beyond the bulletin dates and that a sudden misfire could cause loss of power in traffic. There is no recall for this condition. The dealer found all 4 fuel injectors leaking, even though only cylinders 2 and 4 had set misfire codes and replaced them under warranty with injector service kit 35399-2S133QQH. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 9, 2026 · Fuel system · UT

The car was working perfectly fine I drive it for work all the time and one day it started shaking weirdly. A couple days later the check engine light turned on. It was throwing the code that was pointing to "misfiring in the 3rd cylinder" We changed all the spark plugs, 3rd cylinder coil pack, and switch the coil pack to see if it would say a misfiring in a different cylinder. We then took it to a mechanic saying that it is the high pressure fuel injectors and that he has seen this problem with other Hyundai Tucson around the same year as us and that there was a bulletin on it.

Filed Jul 23, 2026 · Electrical, Engine · PA

The vehicle developed an intermittent but potentially dangerous engine control malfunction. After the engine reached normal operating temperature, the engine speed (RPM) would repeatedly surge while the vehicle was stopped in Park and Neutral, fluctuating from approximately 1,000 RPM to over 3,000 RPM without any throttle input from the driver. The condition occurred with the air conditioning turned off and could be reproduced multiple times. At approximately the same time, the Auto Start/Stop system stopped functioning and displayed a warning indicator. A malfunction indicator lamp (check engine light) also appeared during the incident. The warning light later turned off, but the engine surging continued. This unexpected increase in engine speed raises concerns about unintended vehicle movement or loss of driver control if the condition were to occur while shifting into gear or while driving. The unpredictable nature of the malfunction presents a potential safety risk to the occupants of the vehicle and to others on the road. The vehicle has been taken to an authorized Hyundai dealership for diagnosis and repair and remains under inspection. The problem is available for inspection. During my research, I found numerous reports from other Hyundai owners describing similar engine surging, idle fluctuation, and Auto Start/Stop malfunctions involving comparable vehicles. Because similar complaints appear to have been reported by multiple owners, I am submitting this report so the issue can be evaluated for a possible broader safety defect. I have videos of the incident

Filed Jul 8, 2026 · Acceleration, Engine · NC

I was on the highway on the way to work when my car started stalling. Every time I pressed the gas to give it some power, it would not go anyway where. after getting it towed to get looked at some of the fuel injectors failed and were misfiring. The warning message about ‘check engine’ popped up 2 minutes before it happened. this is the third time now in less than 6 months.

Filed Jan 28, 2026 · Engine, Fuel system · ME

All four cylinders misfired in my car while driving causing the catalytic converter and all four fuel injectors to need to be replaced. My car suddenly stopped driving in a rural area with only a few minutes of warning when the engine light came on. I was not even able to drive to a nearby shoulder. I was stranded on the side of the road in 5 degree weather until a tow truck could come.

Filed Mar 26, 2025 · Fuel system · VA

This is the SECOND time the vehicle has lost power and either had the engine die or stopped producing enough power to drive safely. The first time, the engine lost power to the put of not being able to maintain speed on a very busy highway during rush hour, forcing me to pull to the nearest side (left side of road) that had a narrow shoulder next to fastest vehicles. The most recent event (3/25/2025) took place in a parking lot. Engine was VERY rough at idle and when placed in reverse, it died. Could not restart for ~10 minutes, after which time the problem persisted. In both instances a tow truck had to take vehicle to dealership. In both cases the dealer indicated it was the fuel injectors causing the issues. No check engines lights or other dashboard light came on except for an indication to start the vehicle in Neutral. I used the companies app for the vehicle and no error codes came up. This issue resulted in no damage to persons or property, but could have if I wasn't next to shoulder in the first incident.

Filed Nov 30, 2024 · Fuel system · PA

(1) [XXX] (14,568 mi): The vehicle had been running normally. My wife was about to switch lanes at an intersection when the vehicle started to shake and vibrate. The entire dashboard lit up and the vehicle quickly died. She tried restarting it and the engine wouldn’t turn over. Anytime there was an attempt to restart, there was a potent odor of gasoline. The car died in the middle of the road. It would sort of start but then it wouldn't move and would just shake and smell of gas. After many minutes of trying to start the vehicle, barely got power but was able to pull to side of road around other cars. Hyundai app reported codes: P030300 and P217800. Had car towed to local dealer. Picked the car up and next day spoke to the service manager who indicated there was a 20%-25% chance this would reoccur. He said there was nothing he could do as Hyundai would only cover the cost for the existing issue. The paperwork from the dealer shows it was a P0303 for cylinder 3 misfire and system too rich caused by leaking fuel injector for cylinder 3 (low pressure). [XXX] (14,702 mi) I was driving the car, in middle of an intersection and the vehicle started to vibrate and all lights on dash lit up (check engine, battery, etc.) and smell of gasoline. Car hesitated and wouldn't move. Died in intersection. Had to have 2 people help push me as I was dead in middle of road with people beeping and passing me. Got to side of road and couldn't get vehicle to start. No error codes on app this time, but all symptoms were exactly the same. Called for tow, different dealership due to location. Dealership indicated they would return it to us safe, but because of Hyundai policies, they can only work on the affected items. This is well documented by Hyundai owners of this problem and going by what the service manager of the first location told me, this is common to spread to other injectors. THIS IS UNSAFE! TWICE IN MIDDLE OF INTERSECTIONS! TWO MORE INJECTORS! SOMEONE IS GOING TO GET HURT! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFO

Filed Jul 19, 2024 · RI

Failure to accelerate. While entering Route 95 from on ramp traveling at about 40 miles the car failed to accelerate. Gas pedal revved engine but failed to accelerate and slowed. Safety of myself and others in grave risk as I was trying to merge into traffic that was traveling at 65 miles per hour. I contacted dealer and was told appointment was not available for weeks and they never heard of the problem. I will bring auto into dealership and leave it with them as it is clearly unsafe to drive. No warning light on dash or engine light problem was present.

Filed Dec 15, 2023 · Engine · MT

Engine would not accelerate after stopping at a store. Limped home at 15 mph. Engine light came on a few miles from home. Vehicle would not stay running the next morning and had to be towed to dealership. Problem was an injector that the seal had failed on causing the engine to flood with gasoline. Dealership stated they had seen multiple injector failures and replacement parts now have a different part number implying the injector has been redesigned. Hyundai refused to replace the other injectors as they had not failed yet (they did replace the one that failed). I went ahead and paid to replace the other three. I live in Montana. If I had lost acceleration going up a steep incline or in heavy traffic or car engine failed to stay on in remote area in sub zero temperatures it could have had detrimental consequences.

Filed Oct 4, 2023 · Electrical · NC

When I push the brake and push start button at the same time to start the vehicle, it will appear as if it is fully started. It is not until I put the vehicle in reverse that I notice the vehicle is not fully started. This happens on cold or hot starts and anytime of the day sometimes multiple times a day. The battery, malfunction indicator light, immobilizer, and engine oil pressure lights/lamps are on.The service department advisor did say my vehicle replicated but the vehicle was not hooked up to reader at the time. After that no service technician has been able to reproduce the problem. The vehicle has been to the dealership on 3 different occasions and I have provided them with a video.

Filed Sep 20, 2023 · Brakes, Driver assistance · 62,000 miles · FL

The contact owns a 2023 Hyundai Tucson. The contact stated while driving at an undisclosed speed, the ABS, check engine, low oil pressure, and Forward Collision Avoidance warning lights illuminated. The vehicle was taken to the dealer but was not yet diagnosed. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 6,200.

Filed Jul 9, 2023 · VA

I was driving on I95 and all of sudden the truck started sputtering and shut off. I turned off and back on , it would not go. Then the engine light came on. There was also smoke coming from the tail pipe when I tried again to start it. Back in December 2022, I was driving and the truck cut off and would not start at all. It was diagnosed as the Ignition coil being the problem. This horrible, both times could have been worse because of it cutting off while driving.