Certain 2024MY Kona Electric (SX2 EV) and 2023-2024MY IONIQ 5 (NE EV) vehicles are equipped with a Motor and Reduction Gear System, also known as Motor-Gear Driven Unit (MGDU), that may have received an incorrect amount of oil/fluid during manufacturing. In some cases, the motor and/or reduction gear can produce a grinding/whining noise during operation. Follow the procedures in this bulletin to drain the existing oil and replace it with new oil to resolve this condition.
full bulletin at NHTSA ↗2024 Hyundai Ioniq 5 powertrain problems
moderate 35 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
35
Recalls
0
Avg fix
$2,500
What stands out
Owners have filed 35 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Of the 4 model years of Hyundai Ioniq 5 we track for powertrain problems, this one has the fewest owner complaints on file (35).
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Certain 2022-2024 MY IONIQ 5 (NE1) and 2023MY IONIQ 6 (CE1) may have a condition of the power down warning light (turtle symbol) with "Power is limited" displayed in the cluster, and possible DTC P0A2F. If you are servicing a vehicle with either of these conditions, follow this bulletin to inspect the EOP.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2024 Ioniq 5 vehicles report sudden failure of the Integrated Charging Control Unit (ICCU) while driving, marked by a loud pop and dashboard warnings to stop and check power supply. The failure prevents the ICCU from charging the 12V battery, causing rapid power loss and forcing the vehicle into limp mode (15–40 mph) or complete shutdown. These failures occur without warning, even on vehicles that completed NHTSA Recall 272 and subsequent software updates.
Failures happen at low mileage (9,800–12,000 miles) in vehicles less than a year old. Owners describe dangerous scenarios: loss of acceleration while merging onto highways, sudden deceleration forcing evasive lane changes, complete power loss on unlit country roads in blizzard conditions, and stranding families 60 miles from home after shutdown on rural highways.
Replacement ICCU parts are consistently backordered with no ETA—some owners report waiting 2+ months. Dealership inventory in some regions shows multiple Ioniq 5s with identical failed ICCUs awaiting parts. Critical issue: Hyundai is replacing failed units with the same non-redesigned part, not an improved component. One owner reports a 13-month lease with the vehicle inoperable for over 30 cumulative days due to the same recurring defect. Hyundai's roadside assistance response times significantly exceed quoted estimates. Owners also report independent 12V battery charging failures and, in isolated cases, unexpected backward roll while in Drive mode.
Same Hyundai Ioniq 5 powertrain reports on nearby years: 2022 · 2023 · 2025
Failure modes owners describe
ICCU (Integrated Charging Control Unit) Failure
The ICCU fails suddenly during operation, typically announced by a loud pop sound and warning messages. The failure prevents the unit from properly charging the 12V battery, causing the vehicle to lose electrical power and enter limp mode or shut down completely. Owners report this occurs without warning, even after completing manufacturer recalls and software updates. Replacement units are frequently on backorder with no ETA.
When: Mileage ranges from 9,800 to 12,000 miles; vehicles less than 1 year old to 13 months into leases. Failures occur during normal driving operations.
Symptoms owners cite: Loud pop sound from rear cabin area; Warning messages: 'Stop vehicle and check power supply', 'Check electric vehicle system', 'Check vehicle electrical systems'; Rapid power loss and vehicle speed reduced to 15-40 mph (turtle/limp mode); Complete loss of electrical power including lights, locks, windows, power steering assistance; 12V battery voltage drops rapidly; Vehicle becomes inoperable and will not restart
Codes mentioned: P1A90(96)
Repairs/costs cited: Dealer replacement of ICCU and related fuse required. Replacement parts are frequently backordered (reports of 2+ months, with some dealers unable to provide ETA). Same replacement model that failed is being reinstalled, not redesigned parts.
Recalls/TSBs owners mention: NHTSA Recall 272 and multiple software updates issued, but owners report failures continue after recall completion. Hyundai claim recall was completed; however, failure recurs within months. Roadside assistance response times reported as significantly longer than quoted (4+ hours vs 9 minutes promised).
12V Battery Charging System Failure
The 12V battery charging system fails to maintain charge. The ICCU does not properly regulate charging to the 12V battery, causing rapid discharge even when the vehicle is not in use. Replacement with aftermarket AGM batteries does not resolve the issue as the underlying charging problem remains.
When: Failures reported after parking for one week and during normal operation after 2+ weeks of use with replacement batteries.
Symptoms owners cite: 12V battery completely discharged after short parking periods; 12V battery voltage dropping to 44% or below within 15 minutes of driving; Warning messages: '12V battery voltage low. Stop safely', 'Insufficient power. Check Electrical system'; Vehicle unable to restart without external jump; Inability to lock/unlock doors or operate windows when main power is lost
Repairs/costs cited: Owner replaced OEM battery with AGM battery; failure persisted. Battery monitor installed showed only 44% charge in new 12V battery during operation. ICCU replacement required; parts backordered 2+ months.
Recalls/TSBs owners mention: Dealership installed monitoring equipment; however, software-only recalls have not fixed the root cause of the charging failure.
Loss of Power During Acceleration/Merging
Vehicle unexpectedly enters limp mode or loses acceleration capability during critical driving maneuvers such as highway merging or acceleration, reducing available power to unsafe levels at times when loss of acceleration creates collision risk.
When: Occurs during active driving—merging onto highways, accelerating in traffic.
Symptoms owners cite: Sudden loss of acceleration capability; Vehicle speed restricted to 25 mph in 40-55 mph speed zones; Unable to maintain safe gap to following vehicles; Vehicle behavior unsafe for merging or highway acceleration scenarios
Repairs/costs cited: Related to ICCU failure; ICCU replacement required.
Recalls/TSBs owners mention: Recall 272 listed as applicable; however, failure occurs after recall completion.
Unintended Backward Roll in Drive Mode
Vehicle rolls backward while in Drive (D) mode when stationary or during low-speed driving after pausing. This occurs with i-Pedal one-pedal driving mode enabled. Represents a potential safety hazard as the vehicle receives backward motion command while in forward drive mode.
When: Occurs while using i-Pedal one-pedal driving option.
Symptoms owners cite: Vehicle rolls backward several inches when paused while in Drive mode; Unexpected backward motion command in forward drive; Vehicle moving in opposite direction to selected gear
Repairs/costs cited: Dealership advised and escalated internally; no repair information provided by owners.
Vehicle Stall/Complete Shutdown Without Restart Capability
Vehicle suddenly stalls or shuts down completely during operation with no warning, becoming unable to restart. Power is lost to all systems including propulsion and safety features.
When: Occurs during active driving.
Symptoms owners cite: Vehicle suddenly stops moving without warning; Unable to restart vehicle after shutdown; Complete loss of power to all systems
Repairs/costs cited: Vehicle requires towing to dealership for ICCU diagnosis and replacement.
Synthesized from 35 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 7 most recent
While driving, I heard a loud pop in the rear passenger side and subsequently, the dashboard showed an error to "stop vehicle and check power supply". After driving about 15 minutes, another error showed on the dashboard "12V battery voltage low. Stop safely". After coming to a stop, the vehicle completely shut off and would not turn back on. A tow truck was called and my vehicle was towed to a…
The ICCU failed while driving. A loud pop occured then a red warning light came up asking you to stop the vehicle and check the power supply. The car went into turtle mode where I could at best drive 25 miles per hour. This car was part of a recall last year to prevent this issue, however only a software fix was performed. Luckly I was able to get the car home on a very cold day.
The vehicle is less than 1 years old. Had 91% charge left. Turned in the car as usual. Turned in heated seats and heated steering wheel as the outside temp was 34 degrees. A pop noise occurred and my entire dashboard flashed like a Christmas tree saying electrical system failure. Pull over safety. The cars speed was reduced to 20 mph. This was extremely scary as this happened on a main road…
When I started driving my car a warning to check the electrical system came on the display and the speed of the car dropped to less than 25 mph. The road we were driving on was over 45mph without a safe shoulder. After it was towed to the dealer, they diagnosed that the ICCU had failed and replaced it and a fuse. This was after all recalls and other software updates were performed many months…
My 2024 ioniq 5 has no recall but they have a well known issue where the ICCU does not charge the 12v as expected. this results in loss of power. In my situation, i was driving on the freeway at 65MPH when i got the low 12V battery message and my car slowed down and I was not able to accelerate at even street speed. I was fortunate enough to pull the car over from the left lane to the right…
While accelerating onto a road with cars approaching from behind, vehicle entered limp mode and was restricted to 25 MPH. I was forced to leave the roadway to avoid a collision with the vehicle behind. The street this occurred on has a speed limit of 40 MPH. The vehicle's normal acceleration was sufficient to ensure a safe gap to the approaching car, but the time it took to recognize and react…
When driving in i-Pedal, which is a "one pedal driving option", sometimes after pausing the car rolls backs several inches. This appears to be a defect with the powetrain, regenerative braking engine, or otherwise. Hyundai's dealership has been advised of this issue; they have escalated this internally. A car in drive forward should never due to electrical or software reasons be told to move…
Had powertrain trouble with your 2024 Hyundai Ioniq 5?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2024 Hyundai Ioniq 5?
It's a documented issue but not catastrophic. 35 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2024/Hyundai/Ioniq 5.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.