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Electrical systemPart report

2021 Hyundai Elantra Hybrid Electrical system Problems

Complaints
11about this part
Share
37%of 30 total for the year
Median mileage
44,900miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 11 complaints about the electrical system of the 2021 Hyundai Elantra Hybrid, 37% of the 30 complaints for this model year. Where a mileage was given, the median is 44,900 miles. 1 recall campaign on record is filed under a similar system.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I keep getting intermittent HEV warnings and 12-volt light. The engine then shuts down and I have no power. This has occurred several times while on the highway and this creates a safety hazard. I have been fortunate enough that this happened while I was close to the shoulder, otherwise, it could have been critical. …”

NHTSA complaint #11554043, filed 2023-11

“My 2021 Hyunadai Elantra HEV Blue 12v battery light comes on and I lose power to the engine and all internal electrical components. It has happened while driving on the highway and it is a safety concern. I have addressed it with the dealership and they stated there were no codes and they canot replicate.”

NHTSA complaint #11541657, filed 2023-08

“I am writing to report a serious and ongoing safety issue with my 2021 Hyundai Elantra Hybrid that remains unresolved despite multiple visits to Hyundai service centers and independent repair shops. I’ve also found numerous consumer discussions online describing nearly identical issues with the same model and newer Elantra Hybrid models, suggesting this may be part of a wider systemic defect. The core issue lies within the vehicle’s hybrid system. …”

NHTSA complaint #11661670, filed 2025-05

“At around 93k miles my HECU unit apparently malfunctioned at the same time as the left front tire speed indicator. All of my safety features ABS, adaptive cruise control, lane departure, lane keeping etc do not work because of this.”

NHTSA complaint #11621727, filed 2024-10

“the h e v warning light comes on when driving. the hybrid battery disconnects from the engine and the car is undriveable. have to pull over, stop the car, turn off the car and then reset the hybrid battery. this has happened twice in last week. thank fully i was able to pull over safely, but this a dangerous situation for me and other cars around me. the car had been taken to the dealership just two weeks ago and they were unable to diagnose the issue”

NHTSA complaint #11528504, filed 2023-06

Related recalls

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2025120%
2024350%
20231731%
20221333%
20211137%

Other parts of the 2021 Hyundai Elantra Hybrid

Vehicle speed control
11 complaintsEngine
9 complaintsBrakes
5 complaintsFuel system
4 complaintsOther or unknown
4 complaintsForward collision avoidance
3 complaintsExterior lighting
1 complaintsSuspension
1 complaintsTransmission and drivetrain
1 complaints

← All problems reported for the 2021 Hyundai Elantra Hybrid

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology