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moderate 158 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Electrical accounts for 60% of every owner complaint on file for this vehicle — the dominant problem area across 5 categories tracked.
All 3 active electrical recalls on this vehicle land at critical or severe — none classified moderate.
A rear side air bag that does not deploy as intended can increase the risk of injury in a crash.
An electrical short in the high voltage battery system increases the risk of a fire.
An electrical short in the high voltage battery system increases the risk of a fire.
The manufacturer has issued service bulletins covering electrical 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.
This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system. Refer to the 2026 1st Navigation Map and Software Update Key Improvements and Additional Improvements tables in this TSB for a list of specific changes. The software can be downloaded via Navigation Updater (NAU) and updated by USB.
full bulletin at NHTSA ↗Certain IONIQ 5 (NEA EV) vehicles may have 12V battery drainage due to the scheduled climate feature. Technical Service Bulletin (TSB) 26-01-046H provides instructions to perform a software update for the Vehicle Control Unit (VCU) to improve the logic of the scheduled climate reducing battery drainage.
full bulletin at NHTSA ↗Certain IONIQ 5 (NEA EV) vehicles may have 12V battery drainage due to the scheduled climate feature. This bulletin provides instructions to perform a software update for the Vehicle Control Unit (VCU) to improve the logic of the scheduled climate reducing battery drainage.
full bulletin at NHTSA ↗Some IONIQ 5 (NEA EV) vehicles may exhibit a no START/READY condition when pressing the START/STOP Button (SSB). This bulletin provides the procedure to inspect for the START/READY condition, and if needed, replace the Body Domain Control (BDC) module.
full bulletin at NHTSA ↗Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink functions. This may be due to an occasional disconnection on Verizon’s communication network. Follow the procedures in this bulletin to verify Bluelink Data Communication Unit (DCU) network connection and if needed, reset the DCU in Dealer Mode to resolve the connection.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The dominant failure is ICCU breakdown—a sudden, catastrophic loss of electrical function typically signaled by a loud pop, followed by dashboard warnings and limp-mode operation capping speed at 15–45 mph. This happens across mileage ranges from 200 to 8,700 miles, often within the first six months. The vehicle becomes immobilized and requires flatbed towing. Owners report that parts sit on backorder for four to eight weeks or longer, leaving them without vehicles. This is the same failure mode covered by Hyundai's 2022–2024 recalls but inexplicably excluded from 2025 models despite identical platform architecture.
Concurrent with ICCU failure, the 12V battery experiences repeated deep discharge or premature failure. The Ioniq 5 lacks an alternator; the ICCU's DC-DC converter is the sole 12V charging source. When the ICCU fails, the battery drains. Dealers often recharge and return the battery without replacement, prompting recurrent failures. Owners have measured voltages as low as 1.72V, 3.5V, and 5.5V under light load—critical safety territory.
High-voltage traction battery issues include inability to charge past a threshold, sudden range loss (~50%), faulty cell detection, and Battery Management System warnings. One vehicle has sat at a dealership since June 2025 with no resolution.
The driver attention warning system generates repeated false alerts and unprovoked braking even when drivers are visibly attentive. Hyundai issued a TSB dismissing this as design intent, blaming tall drivers or those wearing glasses.
Owners face weeks without transportation, hazardous limp-mode operation on highways, stranding in winter weather, and no interim remedy from Hyundai.
Same Hyundai Ioniq 5 electrical reports on nearby years: 2022 · 2023 · 2024
The ICCU, which manages charging and DC-DC conversion from the high-voltage traction battery to the 12V auxiliary system, suddenly fails without warning. Failure typically manifests as a loud pop noise, followed by dashboard warnings ('Stop Vehicle and Check Power Supply,' 'Check Electrical Vehicle System'), severe power loss, and limp-mode operation (speeds capped at 15–40 mph). The vehicle becomes undriveable and requires flatbed towing. Failures occur across mileage ranges (200 to 8,700+ miles) and are often exacerbated by cold weather or charging cycles. This is a known defect that affected 2022–2024 Ioniq 5 models under NHTSA Recalls 24V-204 and 24V-868, but the 2025 model year is excluded from those recalls despite using the same E-GMP platform and ICCU architecture.
When: Typically within first 6 months and under 10,000 miles; one failure as early as 200 miles, another at 8,700 miles. Failures often occur during or shortly after charging, or in cold weather conditions.
Symptoms owners cite: Loud pop sound from rear of vehicle or under seat; Dashboard warning: 'Stop Vehicle and Check Power Supply'; Dashboard warning: 'Check Electrical Vehicle System'; Sudden severe power loss and limp-mode operation (15–40 mph max); Vehicle unable to maintain highway speeds; No prior warning or symptom in many cases; 12V battery drains because ICCU provides no charging source; Vehicle becomes completely inoperable and immobile
Codes mentioned: P1A9096, PIA961C, P056216, P1B9700, POA9B11
Repairs/costs cited: ICCU assembly replacement (part 36400-1XAD5 or newer revision 36401-1XAD6); high-voltage fuse replacement (375F2-GI040 or H110); 12V battery replacement (often not performed despite being standard protocol). Repair timelines range from days to months; many owners report parts on backorder for 4–8 weeks or longer. One owner reported 86 days out of service; another 50 days.
Recalls/TSBs owners mention: Hyundai Recalls 24V-204 and 24V-868 cover 2022–2024 Ioniq 5 ICCU failures; 2025 model year excluded despite using same architecture. Owners report that Hyundai corporate initially denied awareness of the defect, then confirmed ICCU failure only after persistent dealer follow-up. Extended repair timelines and lack of loaner vehicles are common complaints. One case notes Hyundai case manager was unhelpful and parts remain on backorder with no ETA.
The 12V auxiliary battery experiences repeated deep discharge events or premature failure, often following or concurrent with ICCU issues. Battery voltage collapses to critically low levels (as low as 1.72V, 3.5V, 5.5V, or 9V) under light electrical load (opening doors, turning on headlights) or during rest periods. In some cases, the battery drains to 0% while vehicle is parked. When ICCU fails, the 12V battery loses its charging source (since the vehicle has no alternator—the DC-DC converter in the ICCU is the only 12V supply). Dealers often recharge the battery and claim it tests good without replacing it, leading to recurrent failures. One owner documented voltage dropping from 99% to 21% then recovering to 79% (consistent with intermittent DC-DC converter output failure) across multiple battery chemistries (OEM and aftermarket AGM).
When: Failures occur within first few months of ownership and under 1,000 miles in some cases; one owner experienced four 12V battery failures under 800 miles. Repeated failures often occur after ICCU repair if 12V battery is not replaced.
Symptoms owners cite: 12V battery voltage collapse under light load or at rest; Vehicle unable to unlock doors or power basic systems; Dashboard indicators showing low or no battery charge despite high-voltage traction battery being charged; Vehicle completely unresponsive (cannot start, shift, or operate); Battery drains to 0% while parked without obvious parasitic drain; Repeated jump-start requirements; MyHyundai app showing inconsistent or false battery state-of-charge readings (e.g., 47% in app while actual 12V is dead); Intermittent voltage collapse without stored fault codes in early occurrences
Codes mentioned: D00, DTC codes from repeated battery resets; no stored codes in some early failures
Repairs/costs cited: 12V battery replacement under warranty; however, dealers frequently recharge and return without replacement, leading to recurrence. One owner paid $209.96 out-of-pocket for rental reimbursement that remains outstanding. After ICCU replacement, if the original 12V battery is not replaced, repeated failures are common. One owner documented three instances of battery voltage below 6V (deemed unsafe); dealer refused replacement.
Recalls/TSBs owners mention: Service advisors initially assured owners that 12V battery replacement is standard protocol after ICCU repair, but many dealers fail to perform it. After repeated failures, Hyundai case managers have engaged engineering but no systemic fix has been deployed. Maryland Lemon Law notice submitted in one case; investigation into PE23-011 requested.
The high-voltage traction battery exhibits anomalous behavior including inability to charge beyond a certain threshold (capped at ~30% in one case), faulty cell detection, and sudden charge-level fluctuations. One vehicle reached 81% charge and jumped to 100% then stopped charging. Another showed rapid loss of range (~50% reduction from expected 344 miles to ~150 miles) following ICCU failure and 12V system reset, attributed to a battery learning reset with unknown root cause. A third failure involved a faulty cell requiring full battery replacement. Dashboard warnings appear (Battery Management System, Battery Overheated) alongside these failures.
When: Battery issues manifest within first 6 months of ownership; one failure at 200 miles, another within 3.5 months. Some occur after ICCU replacement and 12V system interruption.
Symptoms owners cite: Battery unable to charge past a set percentage (e.g., ~30% or 81%); Dashboard warning: 'Battery Overheated! Pull over safely and leave the vehicle'; Dashboard warning: 'Battery Management System' error; Sudden loss of available range (50% reduction reported); Faulty cell detected in battery pack; Inconsistent battery state-of-charge readings on app vs. vehicle state
Codes mentioned: P0B6D00, P1B9700, P0AA700, P1AA700, DTC P056216 (traction battery related)
Repairs/costs cited: Full high-voltage battery replacement required in at least one case. Charging issues attributed to BMS module failure or ICCU-related problems; one vehicle required ICCU replacement plus possible BMS module replacement. Battery learning reset occurred after one ICCU repair, reducing range by ~50% with unclear root cause. One vehicle has been at dealership since June 2025 without resolution after multiple attempted repairs.
Recalls/TSBs owners mention: No specific recall or TSB cited for 2025 Ioniq 5 traction battery issues. One owner in Pennsylvania reported vehicle unable to charge past ~30% for extended period with no clear resolution. Hyundai Engineering engaged in one case (Maryland Lemon Law) but no systemic response noted.
The driver attention monitoring system (forward-facing camera-based) generates repeated false warnings and interventions—commanding drivers to 'take a break,' apply brakes, or disengage cruise control—even when the driver is visibly attentive and both hands are on the wheel. The system triggers alarms, bright red alerts, and automatic brake application without cause. Hyundai has issued TSB 25-GI-001H stating the system is working as designed and blames drivers: suggesting drivers are too tall, should not wear glasses or sunglasses, or are not positioned correctly. This affects multiple owners across different physical profiles, creating potential crash risk when the vehicle suddenly decelerates or disables cruise control in traffic.
When: Occurs repeatedly during normal highway and city driving; one owner reports constant nags after 4 months of ownership; another experienced nearly-caused crashes during regular commuting.
Symptoms owners cite: Repeated false 'take a break' or 'pay attention' warnings while driving normally with eyes forward; Random alarms and bright red alerts on dashboard without cause; Automatic brake application while hands are at 10/2 position on wheel; Cruise control automatically disabled without user input; Nearly caused crashes due to sudden, unprovoked deceleration; System activates regardless of driver glasses, sunglasses, or posture
Repairs/costs cited: Hyundai TSB 25-GI-001H states there is no defect and system is working as designed. No repair offered; Hyundai suggests driver adjustment (remove glasses, adjust seat height, reposition wheel) rather than component replacement.
Recalls/TSBs owners mention: Hyundai issued Technical Service Bulletin 25-GI-001H stating the system is working as designed. Hyundai support suggested that tall drivers, drivers who wear prescription glasses or sunglasses, or drivers not positioned 'correctly' will experience this behavior. No acknowledgment of systemic defect or planned fix; no loaner or remedy offered.
Following ICCU or related electrical failures, vehicles enter severe limp-mode operation where acceleration is restricted to 15–45 mph maximum, speed fluctuates unpredictably, and the vehicle may lose power entirely while in motion or idling. This creates acute safety hazards on highways, urban streets with traffic, and during merges. Drivers experience inability to maintain safe speed, loss of hazard lights and electronic controls, and forced immobilization in active traffic lanes. One owner reported emergency flashers did not function during limp mode, preventing alerting other drivers.
When: Occurs concurrently with ICCU failure or immediately after; can manifest as progressive power loss over minutes or suddenly after a pop sound.
Symptoms owners cite: Speed capped at 15–45 mph regardless of throttle input; Severe acceleration loss on uphill grades (as low as 3–4 mph); Speed fluctuates unpredictably; Loss of motive power while in motion or on inclines; Emergency flashers or hazard lights inoperative; Electronic door locks or power systems fail; Vehicle enters limp mode with turtle icon or reduced-power warnings on dashboard
Codes mentioned: P1A9096, P056216
Repairs/costs cited: Resolution requires ICCU replacement; vehicle remains undriveable until parts arrive and repair is completed. No interim workaround available; vehicle must be towed.
Recalls/TSBs owners mention: No interim fix or software update offered. Hyundai confirms ICCU failure diagnosis and schedules replacement; extended parts backorder timelines reported by multiple owners.
After a complete loss of 12V power (e.g., during battery replacement or extended outage), the vehicle instrument cluster displays 'The vehicle is On, Ready' without explicit operator action (no start button pressed, no key turned). This occurs following a brownout followed by complete 12V loss and recovery. The vehicle appears to enter a drive-ready state unprompted, creating potential safety hazard if propulsion systems could be engaged or if operator is misled about the vehicle's actual state.
When: Occurs after complete 12V power loss and recovery during maintenance (e.g., battery replacement).
Symptoms owners cite: Instrument cluster displays 'The vehicle is On, Ready' without operator input; Vehicle enters drive-ready state following power interruption; No deliberate start command issued
Repairs/costs cited: No repair noted; owner documented via video and multimeter. Safety concern flagged but no manufacturer response reported.
Synthesized from 158 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
Driving my car in 12/27/2025 an emergency stop car warning and loud beeping came on. The car dropped to a speed of abputm10 lies an hour
I was driving with my family on 12/26/2025 and heard a very loud "pop" and then received a warning of "stop vehicle and check power supply." The car went into turtle mode and then stopped working entirely. It was a terrifying situation because there was no place to pull over immediately and the car was not operating. We were stranded as a storm was approaching, could not get a tow, etc. On…
With no warning lamps or lights, heard a pop, car stopped generating power, there was no place to pull over so we put on our hazards and kept driving. Car warning light on batter and it was telling us to stop driving as soon as possible, cars were honking and driving around us. We called AAA and they towed to the dealership we bought the car (it's a new car 8,000 miles). The ICCU failed, they…
I leased a 2025 Hyundai Ioniq 5 (VIN: [XXX] ) on September 16, 2025 from Route 1 Hyundai in Monmouth Junction, New Jersey. Since I bought the vehicle, I have had to return it to the dealership a total of one time. My vehicle has been out of service for repairs since November 19, 2025 for a total of 35 calendar days. The current mileage on my vehicle is 3,026 miles. My vehicle has been in service…
*I received a notification on my screen of the battery malfunctioning after only owning it for 3 1/2 months. *It was unsafe to drive because it was undependable. *I dropped it off at the dealership and was given a loaner a week lateronly after we insisted they owed us one. It has been over 6 months now and I still am driving a Kona loaner which is a downgrade. *No police or insurance reps…
Electrical failure while on the highway. Later diagnosed as failed ICCU issue that also destroyed the 12V battery. Very scary during rush hours traffic with passengers.
High voltage battery failure indicated by "check electrical system" error code and P1AD300 diagnostic code.
While driving, the car abruptly became unable to access the operational battery or to operate the vehicle.
While pulling out of the garage after charging our 2025 Ionic5 we heard a loud “pop”. As soon as we started driving we got a “Check Electrical System” message. We returned home and had our car towed to the Hyundai dealer. We were told that our ICCU failed and would need to be replaced. We are glad this did not happen while we were driving at speed. We are very concerned that Hyundai has a…
On October 10, 2025, while driving the car, a turtle suddenly popped up in place of the speedometer. The car's power and speed was drastically reduced. There was a car behind me that started tailgating me and I could not go any faster than about 15 mph. I was able to make it home. Later that night, I tried to charge the car and it started to overheat. The ICCU recall need to be extended to 2025…
It's a documented issue but not catastrophic. 158 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
Based on the 158 complaints filed, electrical issues most often appear around 45,035 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
Independent shops typically charge around $850 for electrical 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.
Yes — 3 active recall(s) cover electrical issues on this vehicle. Recall fixes are always free regardless of mileage or warranty status. Use the VIN decoder at the top of the page to check if your specific vehicle is affected.