2023 Hyundai Ioniq 5: engine overheating

Filed Aug 5, 2026 · Fuel system · CA · fire

We are reporting a suspected thermal runaway incident involving our recently purchased used 2023 Hyundai Ioniq 5 and have significant concerns regarding the vehicle's safety. **Vehicle Information** * Purchased XXX, 36,662 miles * Clean inspection and no accidents per Carfax **Incident Timeline – XXX** Between 6:00 and 6:30 PM, while traveling northbound on [XXX] just past the [XXX] exit in [XXX], the vehicle struck a white piece of road debris that appeared flat, similar to Styrofoam (video available). There was no immediate loss of vehicle function. [XXX] The vehicle was then moved to the driveway for inspection after a low coolant warning appeared. Damage to the underside near the driver's side and observed blue coolant leaking from the area. The coolant reservoir under the hood was empty. Based on online guidance advising against driving a vehicle with a coolant leak, we decided to leave the vehicle parked in our garage overnight and arrange a flatbed tow to a Hyundai dealership the following day. The garage door was closed, and the vehicle was **not charging**. At approximately 8:10 PM, a burning smell was detected inside the home. Upon opening the door between the house and garage, smoke was observed. The family immediately evacuated, and XXX was called at 8:12 PM. The fire department arrived at approximately 8:18 PM and found the garage filled with smoke. At 8:30 PM, firefighters removed the vehicle from the garage. At 8:35 PM, flames were observed beneath the vehicle. Firefighters applied water directly to the fire until 11:00 PM, after which the vehicle was removed. [XXX] [XXX] [XXX] Manufacturer was contacted; denies any liability due to debris. However, we believe inadequate safety design contributed, including soft protection shield and poor location of coolant. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 23, 2025 · Electrical, Transmission · AZ

I purchased my Hyundai Ioniq 5 on [XXX]. Since then, I have experienced repeated and dangerous failures of the air-conditioning system, which Hyundai and the selling dealership have failed to properly diagnose or repair. On [XXX], while driving, I heard a very loud banging noise coming from the front passenger side of the vehicle. Immediately afterward, the air-conditioning system completely shut down and stopped producing cold air. Before the extreme Arizona heat began, I repeatedly asked Hyundai on Bell Road in Glendale to properly diagnose the A/C system due to ongoing concerns. Despite the vehicle being under warranty, the technician told me I would have to pay a diagnostic fee before they would evaluate the A/C. As a result, the underlying problem was not properly diagnosed or repaired. On [XXX], the exact same failure occurred again the same loud banging noise followed by a complete loss of air conditioning. The vehicle was taken to Hyundai on Bell Road in Glendale a total of four (4) times, spending 33 days out of service for the same issue. Despite this, the dealership failed to repair the vehicle. On several visits, the car was simply parked, and the dealer later claimed it had been “fixed” one time, even though the problem continued. This defect created a serious safety hazard. During one incident, while driving the vehicle in extreme heat to the dealership for repair, the interior temperature became dangerously high. My phone overheated and shut down, and I nearly passed out while driving. Hyundai Corporate has been unresponsive and dismissive. Rather than addressing the repeated failures and safety risks, I was referred to Lemon Law, where my claim was denied, despite the extensive repair history and time out of service. Instead of repairing the defect or taking responsibility, both the dealership and Hyundai Corporate pressured me to trade in the vehicle and move on, without resolving the underlying problem. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 16, 2024 · Electrical, Transmission · VT

Our all-electric AWD Hyundai Ioniq 5 has an issue where the rear motor electric oil pump (EOP) overheats and ceases to function when the problem occurs, which disables the rear motor and effectively causes the car to become a front-wheel drive vehicle with a "hesitation" in the acceleration. This problem only occurs after a long time of high-speed driving and typically on a warm day (upwards of 70-80 degrees F). When the problem occurs, the rear motor ceases to function at all and only the front motor operates to power the vehicle forward. The acceleration is also impacted, such that when the accelerator is pushed, the car "hesitates" for 1-3 seconds before the front motor takes over the demand for power and "lurches" the car forward in a jerky motion. The symptom will last as long as the car is in an overheated state. However, if you pull the car over and let it rest for a period of time (undetermined), the rear motor will again operate normally until it overheats again. For us, this occurred once on a very hot day traveling approximately 50-60 miles on interstate travelling at speeds over 70 MPH. On another occurrence, it happened after driving the car about 200 miles (stopping for a lunch break in the middle), for about 4 hours. When this problem occurs in other cars equipped with RWD only, they lose all forward power in the car and coast to a stop even when the battery still has a charge. We've taken it to our local dealership for repair on Sept 12, 2024 (McGee Hyundai of Barre, VT) and they claim that there is nothing wrong with the vehicle. After researching the topic, I've determined it is the failing rear EOP must be replaced [XXX] and [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 30, 2024 · Fuel system · TN

Vehicle's charging port appears to be overheating to the point that thermal throttling is occurring when attempting to charge. This issue first occurred in mid-May of 2024. Vehicle charged as normal before then. Vehicle was serviced by dealership for this issue on 05/29/2024. A software update was applied that did not solve the problem. In an attempt to find updates on this problem, I contacted Hyundai Customer Care by phone on 05/30/2024. Hyundai Customer Care agent read a scripted response that was first released to the public in 20203 and advised to wait for an unknown amount of time for an unknown fix which may or may not come to pass. Hyundai Customer Care had no updates more recent than the 2023 release from which the Customer Care agent read. This appears to be a known issue with no actual fix available to the customer and no ETA on when such a fix might be released.

Filed Sep 14, 2023 · Electrical, Engine · CA

Rear electric motor overheating on highway and motor shuts off only allowing front motor to work but acceleration is near nothing and is extremely dangerous. No codes or warnings pop up was told by friends with other ioniqs that it's a electric motor oil pump that malfunctions but hyundai refuses to solution ND realize that there is a problem with motor malfunction

Filed Aug 10, 2023 · Electrical · NJ

I took possession of my vehicle 1/12/23 and charged it successfully in my garage with my level 2 charger at 48A per Hyundai's specifications until May 19, 2023. Charging aborted prematurely on that date due to overheating of the charging port. Starting May 20, 2023 I lowered the charging rate in my level 2 charger to 40A despite Hyundai's stated specifications that 48A was supported. I also started tracking my charging with an OBD2 scanner and noted the AC Inlet 1 port temperatures. From 6/26/23 to 7/25/23 as summer temperatures in my garage here in NJ from 75 to 84, peak port temperatures reached 226 to 237 degrees but charging completed. On 7/28/23 with a garage temperature of 86, port temperature reached 239 and charging aborted again. I then had to lower the charging rate to 36A. This is lengthening my charging times and is not consistent with Hyundai specifications when I purchased the car. I am concerned I will have to continue lowering the charging rate to continue operating the vehicle. These high temperatures may also be dangerous. Hyundai so far has merely issued a Technical Service Bulletin 23-EV-003H that does not fix or replace the inadequate part(s), it merely slows down charging inconsistent with their specifications. This is not acceptable and as a safety issue the federal safety agency should require Hyundai to recall and replace the insufficiently performing part(s). My car is available for inspection. This overheating and lengthening charging time is a safety issue. The vehicle has not been inspected by the manufacturer or local dealer. There were no warnings of these occurrences. Charging simply halts when it exceeds 237 degrees Fahrenheit for my 2023 model.

Filed Aug 7, 2023 · Electrical · NJ

Our car repeatedly fails to complete charging using Level 2 chargers at 48-amps. The car sends an overheating error, stops charging and then starts charging again later (presumably after it has cooled down). Sometimes is fails to restart charging completely. This makes it impossible to get a fast, reliable Level 2 charge in a timely manner. We get a text to our cell phones alerting us that charging has stopped due to overheating. We have notified our dealer and they are offering a software patch from Hyundai that simply slows the charge amperage to 28-amps when an overheating error occurs rather than offering a hardware solution that allows for full 48-amp Level 2 charging as the car is supposed to be capable of.

Filed Aug 7, 2023 · Electrical, Fuel system · NY

Level 2 Charging intermittently shuts off or is throttled back to very low charging rates. THis results in car not being charged enough to be used. Hyundai advertises charging rates of 10 KW, but charging is either throttled back to 5 KG or shut when charging at 48 AMps. . Hyundai claims to know of this problem where some internal components of car overheat.

Filed Aug 1, 2023 · Transmission · MA

After owning and driving the 2023 Ioniq 5 for about 4 months, the car was driven from Massachusetts to Arizona. After driving across the county at 75 mph about 50 min on cruse control the car began to lurch, the speed would drop about 3 mph below the cruse control set point, then accelerate to a mile faster than the set point and then settle down to the set point. This would happen multiple times during the next 100 miles before stopping to charge. After charging and again on cruse control at 75 mph or so, the lurching would begin again. After the lurching started, the power display indicated the front motor on this dual motor vehicle was doing all the work to drive the car, and the rear motor was no longer functioning. Later it was confirmed that the rear EOP (electric oil pump) which cools the rear motor was not functioning at all. As a result the rear motor would increase to more than 170 degrees F and stop operating. No DTC was stored for the EOP Actual Speed of zero (despite an EOP Command Speed for 800-3000 rpms). No DTC was stored for the MCU Motor Temperature overheat. No DTC was stored for the MCU Motor Actual Torque of zero when it was commanded for something more. Fortunately the Hyundai Ioniq 5 did command the front motor to take over even though the rear motor was no longer functional, so the car was able to maintain speed most of the time. However, the car is normally 325 hp with both motors. Accelerating with only the 95hp front motor on a heavy car was very slow, both in traffic and on the highway. The lack of performance could easily surprise an unsuspecting driver resulting in a collision or worse. I know of at least 5 owners who have experienced this issue. In each case Hyundai has been slow at best and refused to repair at worst. The issue is without DTC but can none the less be easily diagnosed by observing the ODB EOP Actual Speed (when the car is driven) will be zero with an EOP Command Speed >0 .

Filed Jul 30, 2023 · Electrical · NV

My car fails to charge using Level 2 40 amp charger. The car is supposed to be able to maintain charging between 40 and 48 amps. It is clear that the car is overheating during Level 2 charging and suspending charging. This can be dangerous especially if the car is advertised to be able to charge normally using Level 2 chargers. Note that the summer has been hot. Even in my garage at night, I can no longer charge at 40 amps. I have to lower my Autel charger's current down from 40 amps to 32 amps, and that seems to work. Outdoors during the day, I have to change the car's current to 60%, just so it can continue to charge without overheating. My car is less than 6 months old.

Filed Jul 28, 2023 · Electrical · IN

Charge port is overheating and stopping charging. Widespread issue after the cars age. Their only fix is a software update that drastically throttles current to the car. Rendering very long charging times compared to what was advertised. Something is deteriorating in the electrical system since the cars charge fine when new. Overheated electrical components is very concerning. I hope the federal safety agency makes Hyundai remedy this issue!

Filed Jul 19, 2023 · Electrical · AZ

I have a 2023 Ioniq 5 that was purchased in June, 2023 and an 2023 Ioniq 6 that was purchased in April, 2023. I had a new Chargepoint Home Flex charger installed in April when I purchased my Ioniq 6 and set the charging current to 40 amps. The charger was hardwired directly to my service panel with the appropriate 6 gauge wire and 60 amp breaker. My Ioniq 6 reliably charged at 40 amps until early July when it started dropping the charge rate to 23 amps about 40 minutes into my charging session when using the level 2 charger at home. My Ioniq 5 only charged at 40 amps for the first week of ownership before starting to drop the charge rate to 23 amps. When this behavior started I plugged an OBD2 scanner in and was able to monitor the AC Charging Inlet temperature and noticed that the charge drop happened when the temperature reached 240F. This causes an issue when planning my charge times because they can essentially double, meaning that my vehicles are not ready for a trip by the estimated time. I am also concerned that having electronics that overheat on an EV may be a potential fire hazard in the future. One of the key reasons for purchasing these vehicles was the advertised charge times. I have appointments with the dealership to have both vehicles examined.