Certain IONIQ 5 (NEA EV) and IONIQ 9 (ME1A EV) vehicles (affected VINs listed below) may exhibit a high-frequency noise from the front motor area during low-speed deceleration. This bulletin provides instructions to replace the front motor and gear reduction assembly.
full bulletin at NHTSA ↗2025 Hyundai Ioniq 5 powertrain problems
moderate 53 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
53
Recalls
0
Avg fix
$2,500
What stands out
Owners have filed 53 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.
Powertrain accounts for 20% of all owner complaints filed against this vehicle, across 5 categories tracked.
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 2025MY IONIQ 5 (NEA EV) vehicles are equipped with a Motor and Reduction Gear Motor-Gear Drive Unit (MGDU) differential gear assemblies that are missing a wave washer. This can cause the MGDU housing to make noise. Follow the procedure outlined in this TSB to replace the Front or Rear Motor & Reduction Gear assembly.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2025 Ioniq 5 powertrain cluster shows a dominant failure pattern: sudden ICCU (Integrated Charging Control Unit) breakdown occurring without warning, often accompanied by a loud pop from the rear, followed by immediate loss of drive power and complete electrical shutdown within seconds to minutes. This failure has been documented in vehicles with as few as 2,000–5,000 miles, hitting some owners within the first month of ownership. The ICCU manages both high-voltage battery charging and the 12-volt auxiliary system; when it fails, the vehicle enters limp mode (speed capped at 10–30 mph), then loses all electricity including hazard lights and HVAC. Diagnostic code P1A9096 appears repeatedly and is often misidentified by Hyundai support as an "air flap" issue rather than the actual ICCU failure. Owners report calling Hyundai and being told this affects less than 1% of vehicles, yet online forums and owner discussions document dozens of similar failures. A 2024 recall (24V-868) issued a software update for 2022–2024 Ioniq 5 models, but 2025 models are explicitly excluded from that recall despite exhibiting the same failures. Replacement ICCUs are backordered at dealerships nationwide with wait times of 2–4+ weeks; multiple owners report their vehicles sitting in service bays for 3+ weeks with no ETA. Secondary issues include charging failures (Level 2 chargers fail to charge the battery), highway speed reduction and hesitation (vehicle jerks and pulsates at 55–78 mph), and 12-volt battery discharge. Hyundai has stated there are no plans to redesign the ICCU and no immediate fix beyond replacement—which means another potentially faulty unit. One Massachusetts owner's vehicle was declared a lemon under state law.
Same Hyundai Ioniq 5 powertrain reports on nearby years: 2022 · 2023 · 2024
Failure modes owners describe
ICCU (Integrated Charging Control Unit) Failure with Complete Power Loss
The ICCU, which manages high-voltage battery charging and the 12-volt auxiliary battery system, fails suddenly—often with an audible pop from the rear of the vehicle—causing immediate loss of propulsion and eventually complete electrical shutdown. Owners report losing all power, hazard lights, HVAC, and drive capability within seconds to minutes of the initial warning.
When: Typically under 10,000 miles; many failures in first 2-3 months of ownership. Several failures reported within the first few thousand miles (as low as 2,056 miles, 2,949 miles, 3,109 miles, 3,500 miles).
Symptoms owners cite: Loud pop or bang from rear of vehicle; Sudden loss of propulsion and drive power; Vehicle enters limp mode (speed limited to 10–30 mph initially); Complete electrical system shutdown follows within seconds to minutes; Dashboard warning lights: 'Check Electric Vehicle System,' 'Stop Vehicle and Check Power Supply,' 'Check Electrical System'; Battery warning indicators light up; Vehicle becomes immobile and unresponsive; Hazard lights and HVAC system inoperative after shutdown
Codes mentioned: P1A9096, P1A9096 (Electric Vehicle / Air Flap system, though owners report this is a misdiagnosis), P31C507, P056216 (Voltage Regulation fault, Hybrid Control system), P1AD3(00)
Repairs/costs cited: ICCU replacement required. Replacement part is backordered at multiple dealerships with wait times of 2–4+ weeks (some owners report being in the shop for 3+ weeks with no ETA). Associated fuse may also require replacement. Repair typically covered under manufacturer warranty. Multiple owners report dealer inability to obtain parts; one owner reports dealership had three other Ioniq 5s waiting for ICCUs.
Recalls/TSBs owners mention: Hyundai Roadside Assistance towing available. Recall 24V-868 (software update) was issued for 2022–2024 model year Ioniq 5s but does not include 2025 model year vehicles. Owners report Hyundai claiming this affects <1% of vehicles despite widespread online reports. One owner report states Hyundai has stated there are no plans to redesign the ICCU and no immediate replacement supply. Some owners report Hyundai declining to acknowledge ICCU as a defect on the 2025 model. One vehicle was declared a lemon under Massachusetts state law.
Charging System Failure (Level 2 Charging Malfunction)
The ICCU fails to properly manage charging from Level 2 home charging units, resulting in repeated failure of the high-voltage battery to charge overnight. The ICCU is responsible for managing both high-voltage and auxiliary 12-volt battery charging; a failure disrupts both systems.
When: Multiple occurrences over several days after overnight charging sessions. Failure reported with fewer than 10,000 miles on the vehicle.
Symptoms owners cite: High-voltage battery fails to charge overnight despite Level 2 charger connected; Intermittent slow charging behavior; Auxiliary 12-volt battery completely discharged approximately 6 months prior to the charging failure event; All warning and alarm indicators on dashboard trigger simultaneously during one charging event; Vehicle becomes completely inoperable during charging session
Repairs/costs cited: ICCU replacement required. Parts availability delayed; one owner reported awaiting parts with estimated repair time of one week (as of March 6, 2026). Repair covered under manufacturer warranty.
Recalls/TSBs owners mention: Diagnosis performed at authorized Hyundai dealership (March 6, 2026). Repair expected to be covered under manufacturer warranty.
Highway Speed Reduction / Limp Mode During Normal Operation
Vehicle unexpectedly enters a limp mode or reduced-power state while driving at highway speeds, limiting maximum speed to 20–40 mph. This occurs without prior warning and forces the driver to safely exit the roadway.
When: Occurs during normal highway driving, sometimes immediately after startup or during acceleration. One incident occurred 7 months into ownership on a lease vehicle.
Symptoms owners cite: Sudden speed reduction from 60 mph to 40 mph, then to 20 mph within minutes; Maximum speed limited to 12–30 mph; Vehicle hesitates, shudders, or pulsates at highway speeds (55–78 mph range); Engine or motor feels like it is cutting in and out; Juddering forward and back motion; Dashboard warning: 'Check Electric Vehicle System'; Vehicle responds sluggishly or inconsistently to throttle input
Codes mentioned: P1A9096
Repairs/costs cited: Limp mode is a safety mechanism; dealership diagnostics have been unable to resolve the underlying issue in some cases. One dealership suggested tire rotation as a potential fix with no resolution. ICCU or voltage regulation issues suspected by owners.
Recalls/TSBs owners mention: Dealers have limited guidance; some state Hyundai has no further information available on the issue. No TSB or remedy provided for hesitation/shuddering at highway speeds.
12-Volt Auxiliary Battery Discharge and System Collapse
The 12-volt auxiliary battery is unable to maintain charge due to ICCU failure, leading to cascading electrical system failure. The ICCU is responsible for managing the 12V system; failure allows the auxiliary battery to drain, eventually leaving the vehicle with no electrical power.
When: Occurs in conjunction with ICCU failure. One owner reported the auxiliary battery found completely discharged approximately 6 months before a later complete ICCU failure event.
Symptoms owners cite: 12-volt auxiliary battery unable to maintain charge; Battery warning lights on dashboard; Progressive electrical system degradation; Cascading electrical failure following initial ICCU event; Complete loss of 12V power preventing operation of hazard lights, locks, and other electrical systems
Codes mentioned: P056216 (Voltage Regulation fault)
Repairs/costs cited: Replacement of ICCU restores 12V system management. Multiple owners report the part is backordered with no clear ETA for repair.
Recalls/TSBs owners mention: Hyundai acknowledges ICCU failure can result in loss of charging capability and auxiliary battery drain per one owner's diagnostic report. Warranty coverage available.
Vehicle Will Not Start / No Power on Startup
Vehicle exhibits complete failure to start with no lights, no power, and inability to open doors. AAA jump-starting may temporarily restore some function, but the vehicle loses power again during operation.
When: Reported on first startup of the vehicle after an overnight charging session, and on multiple restart attempts after an initial failure.
Symptoms owners cite: No lights on dashboard; No electrical power at startup; Unable to open doors electronically; Vehicle unresponsive to key fob or start button; Jump-starting provides temporary recovery only; power lost again during subsequent operation
Repairs/costs cited: Dealer inspection found no fault with battery or electrical system on initial inspection, but later diagnostic revealed ICCU failure. One owner reports six failures to start with dealer unable to fix.
Recalls/TSBs owners mention: Hyundai Roadside Assistance (AAA) responds to calls; attempted jump-starting. Dealer inspection initially found no battery or electrical system fault, later diagnosing ICCU issue.
Throttle / Acceleration Loss During Operation
The gas pedal or throttle becomes unresponsive during driving, resulting in sudden loss of drive power and inability to accelerate. This occurs while the vehicle is in motion, forcing the driver to coast to safety.
When: Reported on a trip from home to a local grocery store; occurred a few weeks after the vehicle failed to start initially.
Symptoms owners cite: Gas pedal stops responding; Loss of drive power mid-trip; Warning light appears on dashboard; Vehicle coasts to a stop with no acceleration capability; Larger warning light appears; vehicle then loses all electricity
Repairs/costs cited: Diagnosed as ICCU failure and towed for dealer service.
Recalls/TSBs owners mention: Hyundai Roadside Assistance towing; dealer service.
Dashboard Warning Light Cascade and Instrument Cluster Errors
Multiple dashboard warning lights and indicators trigger simultaneously or in rapid sequence, often with loud alarm tones. This can occur even when the vehicle is parked or charging, and may clear spontaneously without intervention.
When: One incident occurred during a charging session approximately 6 months before a later confirmed ICCU failure. Other incidents occurred during active driving or at startup.
Symptoms owners cite: Every warning and alarm indicator on dashboard triggers at once; Loud alarm or chime sounds; Vehicle becomes completely inoperable when this occurs; Warnings may clear spontaneously after several minutes; Battery overheated warning; Multiple error messages including P1A9096 (misidentified as air flap fault)
Codes mentioned: P1A9096, P1AD3(00)
Repairs/costs cited: Indicative of ICCU failure or voltage regulation issues. Vehicle may spontaneously resume normal operation temporarily.
Recalls/TSBs owners mention: Hyundai support reportedly misidentifies P1A9096 as an air flap problem rather than ICCU failure.
ADAS and Cruise Control Failures
Adaptive cruise control and lane-change detection fail to function properly. Cruise control may cause the vehicle to slow unexpectedly, and the system fails to detect vehicles in adjacent lanes during lane-change attempts.
When: Reported on highway and freeway driving at cruising speeds.
Symptoms owners cite: Cruise control faults and unexpected slowing at freeway speed; Vehicle slows when large vehicles are in nearby separate lane; Fails to detect vehicle in next lane when initiating lane change; Multiple documented ADAS cruise control faults
Repairs/costs cited: Dealer unable to fix; attributed to broader electrical or control system issues.
Recalls/TSBs owners mention: Dealer reports unable to repair; delayed appointment and extended out-of-service time.
Electronic Door Lock and Key Fob Malfunction
Electronic door lock and key fob functions fail, with doors either refusing to unlock or falsely locking the vehicle when the owner approaches with the key.
When: Reported as part of a broader electrical system failure pattern on one vehicle.
Symptoms owners cite: Electronic unlock fails to function; Vehicle falsely locks on owner approach with key fob
Repairs/costs cited: Associated with broader electrical system failures; dealer unable to repair.
Recalls/TSBs owners mention: No resolution provided; dealership unable to address the issue.
Voice Command System Failure
Voice command functionality fails in both native system and CarPlay app integration.
When: Reported as part of broader electrical system failures.
Symptoms owners cite: Voice commands fail to function in native system; Voice commands fail in CarPlay app
Repairs/costs cited: Associated with electrical system issues; dealer unable to repair.
Recalls/TSBs owners mention: No specific resolution provided by Hyundai.
Synthesized from 53 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
I was driving on the freeway in the left lane when suddenly a bunch of error lights popped up on the dash and the car threw itself into neutral. When I tried to give the car acceleration it wouldn’t go which is when I realized the car was in neutral. When I tried to go into drive it did not go so I turned the hazard lights on. Turned off the car, turned it back on and then again all the error…
The ICCU unit failed causing the car to first have low power, reducing the maximum vehicle speed to 25 MPH, then causing the 12V battery to lose charge making the car inopperable.
On the afternoon of Saturday, December 12th 2025 I was preparing my car for a trip an hour north and back to drop my daughter off with her grandmother. I was charging my car with my Level 2 charger and preheating my car. Upon leaving for the trip, within a half mile I heard a loud popping sound coming from the rear of the vehicle and immediately had a warning on the vehicle stating "Stop Vehicle…
I was leaving from a friends' house and got a "Check electric vehicle system" error and the car went into "limp" mode while on the road. I drove to a hotel parking lot and dropped off my family then proceeded the next day to drive the car to a local dealership for service and the car maxed out at 12 mph before crawling to 1 mph while going up a hill before I could find a place on the side of the…
My car worked to get to an appointment on 22 Nov. It flashed an error 2 minutes into a 20 minute return trip, saying the cars propulsion failure was imminent. Vehicle would not turn back on after the 3 mile drive home. The ICCU failed. If this failed while driving, or while I was in a hot/cold location, my life and those around me would have been at risk. The dealer has been working with…
The ICCU (Integrated Charge Control Unit) failed. Fortunately I was in a parking lot at the time, as the vehicle limited its top speed to around 25 mph. Had the failure occurred on a highway it could have caused a collision. While this is a 2025 model year Ioniq 5, the ICCU hardware (part 36400-1XAA0) remains unchanged across all Hyundai/Kia/Gensis vehicles sharing the eGMP platform. NHTSA…
Had powertrain trouble with your 2025 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 2025 Hyundai Ioniq 5?
It's a documented issue but not catastrophic. 53 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/2025/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.