Recall 21V727 affects 95,515 2017 Hyundai Sonata Hybrid and Tucson vehicles for premature connecting rod bearing wear. Repair is free at any franchised Hyundai dealer.
Hyundai is recalling 95,515 2017 Sonata Hybrid and Tucson vehicles because connecting rod bearings inside the engine can wear prematurely and damage the engine. A damaged engine can raise the risk of a fire or cause an engine stall, which raises crash risk, and Hyundai dealers will complete the recall repair free of charge.
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What's wrong?
The engine in the 2017 Hyundai Sonata Hybrid and Tucson uses connecting rods to link each piston to the crankshaft. A connecting rod bearing is the smooth metal surface between those moving parts. It lets the rod spin on the crankshaft while engine oil keeps the parts separated and moving freely.
In this recall, the connecting rod bearings inside the 2.0-liter Nu GDI engine wear too early. As that bearing surface wears down, the rod loses its smooth support and starts to knock against the crankshaft instead of rotating cleanly. Continued operation can damage the engine, and a broken connecting rod can punch through the engine block.
Owners can notice an abnormal knocking noise from the engine, reduced power, or hesitation. The Check Engine light or engine oil pressure warning lamp can turn on. A burning smell, oil leak, or smoke is also a warning sign.
Who's affected?
Covers both the Sonata Hybrid and Tucson from the 2017 model year, tied to the same sub-engine assembly.
| 2017 Hyundai Sonata Hybrid | Engine |
|---|---|
| 2017 Hyundai Tucson | Engine |
| Units affected | 95,515 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific vehicle.
What's the safety risk?
A damaged engine can raise fire risk or cause a stall, which raises crash risk. Watch for knocking, reduced power or hesitation, a Check Engine light, oil pressure warning, burning smell, oil leak, or smoke. Schedule the recall inspection soon. Repair is free at any franchised Hyundai dealer.
What should I do?
- Check your VIN to confirm your 2017 Hyundai Sonata Hybrid or Tucson is included in this recall.
- Contact a franchised Hyundai dealer to schedule the free engine inspection and KSDS software update for the connecting-rod-bearing wear condition.
- Bring the recall notice if Hyundai mailed one. If not, reference recall number 21V727 when you call.
- Keep the repair appointment even if the vehicle still runs normally; the dealer needs to inspect the engine and install the KSDS update.
- Stop driving and call a Hyundai dealer if the engine stalls or shows engine damage before the repair.
What happens at the repair
At the dealer, a Hyundai technician inspects the engine for bearing damage. If the inspection finds damage, Hyundai replaces the engine. The technician also installs a software update with Hyundai's Knock Sensor Detection System, which helps detect bearing-related engine knock after the repair visit. Parts and labor are covered under the recall. Hyundai also provides reimbursement for owners who already paid for related repairs under its submitted reimbursement plan. Contact Hyundai customer service and keep repair documentation available for the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| September 17, 2021 | NHTSA published the recall |
|---|---|
| November 12, 2021 | Dealer notification began |
| November 12, 2021 | Dealer notification ended |
| November 12, 2021 | Interim owner notification (was planned for this date) |
| January 15, 2022 | Owner notification mailed |
Frequently asked questions
What is recall 21V727?
Recall 21V727 covers 95,515 2017 Hyundai Sonata Hybrid and Tucson vehicles with connecting rod bearings that can wear prematurely and damage the engine. A damaged engine can increase fire risk or cause an engine stall, increasing crash risk. Hyundai dealers will inspect the engine, replace it if needed, and install KSDS software for free.
What should I do if my 2017 Hyundai Sonata Hybrid or Tucson is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 21V727. If it is, contact a franchised Hyundai dealer to schedule the engine inspection and KSDS software update. If bearing damage is found, Hyundai will replace the engine for free. Reference recall 21V727 or Hyundai recall 209 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Hyundai's remedy says the inspection, KSDS software update, and any required engine replacement are free. Use a franchised Hyundai dealer for the recall work.
Is it safe to drive my 2017 Hyundai Sonata Hybrid or Tucson?
There is no do-not-drive order for recall 21V727. The risk is still serious because bearing wear can damage the engine, increase fire risk, or cause an engine stall. Confirm your VIN, schedule the dealer inspection, and ask Hyundai service what to do if the engine is noisy, stalls, or shows warning lights.
When were owners notified about recall 21V727?
Hyundai notified owners of the defect on November 16, 2021, and mailed owner letters on January 15, 2022. If you bought the vehicle used or never received a letter, the VIN decides whether the free recall repair applies to your specific Sonata Hybrid or Tucson.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V727000 |
|---|---|
| Hyundai customer service | 1-855-371-9460 |
| NHTSA recall # | 21V727 |
| NHTSA recall # (full) | 21V727000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Recall Document (PDF) (PDF)
- Download Quarterly Report (PDF)
- Download Misc. Document (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →