Owners of 2015 Hyundai Sonatas report consistent seatbelt malfunctions that began around 2018 and have persisted with no remedy. The most common complaint is driver and passenger belts failing to retract after unbuckling—hanging on the floor instead and requiring manual repositioning. Several owners describe belts that don't lock into place during hard braking or emergency stops, leaving occupants unsecured; one owner reported his wife's seatbelt failed to lock during sudden traffic braking, causing her neck injury.
Dealers consistently declined to address the issue under warranty, with some claiming wear rather than defect and quoting $700 for driver-side replacement. One owner brought the problem to service multiple times over five years; it was never recorded or fixed. Hyundai issued a recall for the identical seatbelt retraction failure on 2011–May 2014 Sonatas, affecting over one million vehicles, but excluded the 2015 model despite 15 documented complaints dating back to September 2015. When an owner escalated to Hyundai customer support, the case worker stopped responding to calls and emails, claiming the belts were past their seven-year warranty.
One owner also reported seatbelt material fraying inside the upper housing after only one year, with roughly one-third of the belt width missing. Another described his belt tightening independently while driving at 45 mph, though dealer diagnostics couldn't reproduce it.
Failure modes owners describe
Seatbelt fails to retract after unbuckling
Driver or passenger seatbelt does not automatically retract when released from the buckle. Belt hangs on floor or remains extended, requiring manual repositioning.
When: Began around 2018 in some cases; ongoing across multiple model years of 2015 Sonata
Symptoms owners cite: Belt remains extended on floor after unbuckling; Requires manual feeding back into mounting; Seatbelt hangs instead of retracting snugly
Repairs/costs cited: Dealerships quoted $700 for driver side seatbelt replacement; some dealerships dismissed the issue or refused to address it
Recalls/TSBs owners mention: Recall issued for 2011–May 2014 Hyundai Sonatas for same issue; 2015 model excluded despite identical problem reported 15+ times. Hyundai stated belts are past warranty period (approximately 7 years).
Seatbelt fails to lock during sudden braking
Seatbelt does not lock or engage into restraint position when vehicle brakes are applied, especially during hard or emergency braking. Belt remains loose and does not provide proper restraint.
When: Ongoing; no specific mileage noted
Symptoms owners cite: Seatbelt does not lock when brakes applied; Belt remains loose during emergency braking; Occupant body moves forward during abrupt stops; Occupant injury reported (neck strain) when belt failed to lock
Repairs/costs cited: Dealership diagnostic confirmed malfunction; dealership claimed wear issue rather than defect and stated owner would pay for full replacement
Recalls/TSBs owners mention: Hyundai customer support case opened but worker did not respond to follow-up calls or emails; stated issue is out of warranty
Seatbelt material fraying and deterioration
Driver side seatbelt material frays inside the upper housing and deteriorates. Approximately one-third of belt width completely missing in one case.
When: After only one year of use
Symptoms owners cite: Fraying inside upper housing; Approximately 1/3 of belt width completely gone; Continued deterioration
Seatbelt tightens independently while driving
Seatbelt on front driver side tightens on its own while vehicle is in motion, recurring intermittently.
When: At approximately 45 mph; approximate failure mileage 3 miles
Symptoms owners cite: Seatbelt tightens independently while driving; Recurring failure
Repairs/costs cited: Dealer diagnostic testing unable to reproduce or diagnose failure
Recalls/TSBs owners mention: Manufacturer notified of failure
Seatbelt fails to engage or lock into buckle
Seatbelt will not engage or lock into restraint position on buckle during multiple attempts to fasten.
When: No specific timing given
Symptoms owners cite: Seatbelt would not engage when attempting to lock in place; Failure on several attempts
Synthesized from 17 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.