For like the fifth time while I'm driving the car just dies. I can be going 55 I can be going 70 and the dashboard lights up like a Christmas tree and the car just dies. I have to pull the car over to the side and I have to turn it off and restart it again. And then about 3 days later the check engine light will go away. This seems like a software issue but Hyundai and my local dealer cannot help…
2023 Hyundai Sonata powertrain problems
severe 14 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
14
Recalls
0
Avg fix
$2,500
1crash
The failure pattern owners describe
Buyer takeaway: Used 2023 Sonata buyers should be aware of recurring powertrain failures reported across multiple units: complete engine shutdown at highway speeds, limp-mode acceleration loss, transmission delay and malfunction, and spontaneous gear shifting. Dealerships have struggled to reproduce and fix these issues despite multiple service visits; get a thorough pre-purchase inspection by an independent shop and review service history carefully.
Owners of 2023 Hyundai Sonatas report serious powertrain failures occurring throughout ownership, sometimes within the first few months. The most dangerous failure is complete engine shutdown without warning while driving at highway speeds (55–70 mph). One owner experienced this seven times in a year; another five times; a third reported thirteen instances in four months. When it happens, all dashboard lights illuminate simultaneously, the engine dies, and the driver must coast to the roadside. A check engine light typically appears afterward, and the vehicle restarts normally—until the next episode.
Another major issue is limp mode or loss of acceleration: the engine revs but the transmission doesn't respond, leaving the car stuck in a state where RPM climbs but speed doesn't. One owner reported this occurred thirteen times in four months, including on snow-covered roads and at 70 mph on the interstate with no shoulder available.
Transmission problems include delayed engagement (up to ten seconds) on take-off, hard shifting in the 0–40 mph range, and failure to engage selected gears. One owner reported the transmission spontaneously shifted from Drive to Park while driving—eight separate times. Another described selecting Reverse but the car moving forward instead.
A fuel tank expansion defect has also emerged, with visible bulging and rear seats popping up; dealerships have offered no repair path.
Dealerships across multiple visits have been unable to reproduce most issues or provide diagnosis, leaving owners without solutions despite repeated service attempts.
Same Hyundai Sonata powertrain reports on nearby years: 2020 · 2021 · 2022
Failure modes owners describe
Complete Power Loss While Driving
Engine shuts down unexpectedly without warning while vehicle is in motion at highway speeds (55–70 mph), requiring driver to coast to safety. Typically happens sporadically; one owner reported 7 incidents over a year, another reported 5 incidents, another 13 times in 4 months.
When: At highway speeds, sporadic; one case at 568–9531 miles, others early in ownership
Symptoms owners cite: Dashboard lights illuminate (multiple lights simultaneously described as 'like a Christmas tree'); Engine shuts down while driving; No warning before power loss occurs; RPM gauge may show activity but no acceleration; Requires turning vehicle off and restarting to regain function
Codes mentioned: P0651, P06531
Repairs/costs cited: One owner reported transmission replacement attempted at dealership, though technician was unsure of root cause. Multiple owners report dealerships cannot reproduce the issue or perform diagnosis without extended service holds.
Recalls/TSBs owners mention: Hyundai BlueLink detected 'possible condition with Engine Control System' in one case; no recalls found in narratives at time of complaint. One owner stated case opened with Hyundai corporate for over a month with no resolution.
Limp Mode / Loss of Acceleration While Driving
Vehicle enters limp mode or loses power during acceleration; engine revs but transmission does not respond or vehicle does not move forward at normal speed. Occurs on multiple occasions, including at highway speeds and during traffic merges.
When: Throughout ownership; one case at 2 days old, others recurring over months
Symptoms owners cite: RPM increases but no change in vehicle speed; Vehicle jerks then enters limp mode; Engine runs but transmission doesn't respond to throttle; Happens multiple times (13 times in 4 months reported by one owner); Occurs without warning, including in heavy traffic and on interstate
Codes mentioned: P06531
Repairs/costs cited: One owner had transmission replaced at dealership, though root cause remained undiagnosed per service report. Other owners report dealerships cannot diagnose the issue after multiple visits and test runs.
Recalls/TSBs owners mention: No manufacturer action documented in narratives.
Transmission Delay and Shift Malfunction
Transmission exhibits delayed response on take-off (up to 10 seconds) and fails to downshift properly. Also includes hard shifting between 0–40 mph and instances where transmission does not engage the selected gear (e.g., reverse not engaging).
When: From early in ownership; one case at 2 days old
Symptoms owners cite: Delayed engagement (up to 10 seconds) when taking off from stop; Transmission bogs down instead of downshifting; Hard shifting from 0–40 mph range; Selected gear does not engage (reverse selected but vehicle moved forward); No warning lights before incidents
Repairs/costs cited: One owner's dealership reproduced the problem but could not obtain approval for transmission replacement from tech line. Another owner's vehicle remained in shop since 7/26/24. Repairs attempted include transmission replacement.
Recalls/TSBs owners mention: No recalls or official response documented in narratives.
Unwanted Gear Shifts (Drive to Park, or Reverse Engagement Failure)
Transmission spontaneously shifts from Drive to Park while driving (one owner reported 8 occurrences), or fails to engage selected gear. In one case, reverse was selected but vehicle moved forward; in another, transmission shifted from Drive to Park without driver input.
When: Various; one case occurred multiple times over ownership period
Symptoms owners cite: Transmission shifts from Drive to Park unexpectedly while driving; Vehicle must be turned off and restarted to regain drive; Selected gear (reverse) does not engage; opposite direction occurs; Happens while driving at normal speeds and in traffic
Repairs/costs cited: No repairs documented in narratives; one owner noted intention to inspect for error codes at repair shop.
Recalls/TSBs owners mention: No manufacturer action documented.
Fuel Tank Expansion
Fuel tank expands abnormally, causing visible bulging. Owner reports this is a common defect among 2021–2024 Hyundai Sonata and Kia K5 models, with back seats popping up as a secondary effect. Issue may be related to persistent fuel system fault codes.
When: Owner had P0451 code since March; fuel tank issue discovered later (mileage at time of complaint approximately 90k miles)
Symptoms owners cite: Fuel tank bulges outward visibly; Back seats pop up; No obvious external cause
Codes mentioned: P0451
Repairs/costs cited: Dealership could not diagnose or repair. Owner reports Kia has issued recall for similar tanks on K5 models and will repair free of charge. Hyundai initially denied coverage under warranty (60k mile limit exceeded at 90k miles).
Recalls/TSBs owners mention: Hyundai corporate case opened; over one month elapsed with no resolution. Warranty claim denied. Owner notes Kia offering free repair for identical issue on K5.
Emergency Braking System Activation (Unintended)
Emergency braking system activates without driver input while vehicle is being driven on interstate, causing unexpected braking and loss of vehicle control.
When: After 6-day service hold; occurred on drive home from dealership
Symptoms owners cite: Emergency braking system activates without warning; Sudden unexpected braking on interstate
Repairs/costs cited: No repairs documented in narratives.
Recalls/TSBs owners mention: No manufacturer action documented.
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
On 4 occasions in the last 4 months when I push the gas my cars rpm will go up but the car does not accelerate. This has happened twice on the interstate when trying to merge with trsffic and twice in city traffic, once when making a lefthand turn across oncoming traffic and once just driving down the road. I have taken the car to 2 separate dealerships for a total of 3 times and they drive it…
Had powertrain trouble with your 2023 Hyundai Sonata?
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 2023 Hyundai Sonata?
It's a meaningful issue. 14 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
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/2023/Hyundai/Sonata.
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.