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Hyundai C2721

System Calibration Required LDWS (Lane Departure Warning System). This TSB includes repair justification in the form of automatically upl

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService need is not explicitly established by the supplied evidence; however, front-camera target calibration is referenced in the official Hyundai TSB and should be evaluated by a Hyundai dealer or qualified service provider.
Confidence95%

Quick answer

C2721 is identified as “System Calibration Required LDWS (Lane Departure Warning System).” Verified Hyundai TSB evidence references front-camera target calibration and states that performing this calibration will cause DTC C2721.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does C2721 mean?

C2721 is identified as “System Calibration Required LDWS (Lane Departure Warning System).” Verified Hyundai TSB evidence references front-camera target calibration and states that performing this calibration will cause DTC C2721.

2. Technical explanation

The supplied official Hyundai/NHTSA manufacturer communication identifies C2721 as a Lane Departure Warning System (LDWS) calibration-required diagnostic trouble code. The verified evidence specifically references performing front-camera calibration using a target. It also states that if front-camera target calibration is performed, another DTC C2721 will occur. The supplied evidence does not establish the complete diagnostic sequence, root cause, or final repair procedure for C2721.

3. What system is affected?

Lane Departure Warning System (LDWS), with verified reference to the front camera and front-camera target calibration.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • A C2721 diagnostic trouble code may be stored.
  • No driver-visible symptoms are established by the supplied verified evidence.

6. Possible causes

  • A system calibration requirement for the Lane Departure Warning System is identified by the code definition.
  • The supplied TSB evidence references front-camera target calibration.
  • No underlying cause beyond the calibration-related code description is established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis by a Hyundai dealer or qualified service provider.
  • Provide the technician with DTC C2721 and reference Hyundai TSB 26-AD-001H / NHTSA manufacturer communication MC-11029906-0001.
  • Do not attempt front-camera calibration unless performed with the applicable service procedure and equipment.

10. Step-by-step troubleshooting

  1. Confirm the stored DTC is C2721.
  2. Review Hyundai TSB 26-AD-001H, published February 25, 2026, for the applicable procedure.
  3. The verified TSB evidence references front-camera calibration using a target.
  4. Further diagnostic steps are not yet established by the supplied verified evidence.

11. When to contact service

Service need is not explicitly established by the supplied evidence; however, front-camera target calibration is referenced in the official Hyundai TSB and should be evaluated by a Hyundai dealer or qualified service provider.

12. What the service center may check

  • Retrieve and confirm DTC C2721.
  • Review the applicable Hyundai TSB procedure for front-camera target calibration.
  • Determine whether the vehicle requires the TSB-directed calibration process. Additional checks are not established by verified evidence.

13. Possible repair or resolution

  • The verified TSB evidence references performing front-camera calibration using a target.
  • The complete repair resolution is not yet established by the supplied verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Hyundai TSB 26-AD-001H, documented by NHTSA as Manufacturer Communication MC-11029906-0001, published February 25, 2026. The supplied evidence references front-camera calibration using a target and C2721, “System Calibration Required LDWS (Lane Departure Warning System).”

16. Recall information

  • No recall information was supplied or established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 11029906, Hyundai TSB 26-AD-001H, published February 25, 2026: https://static.nhtsa.gov/odi/tsbs/2026/MC-11029906-0001.pdf

19. Frequently asked questions

What does Hyundai code C2721 mean?

The supplied official TSB evidence identifies C2721 as “System Calibration Required LDWS (Lane Departure Warning System).”

What system is associated with C2721?

The verified code description identifies the Lane Departure Warning System. The TSB evidence also references the front camera and front-camera target calibration.

Does the TSB mention calibration?

Yes. The supplied official TSB evidence states to perform front-camera calibration using a target and states that performing front-camera target calibration will cause another DTC C2721.

Is it safe to drive with C2721?

Not yet established by verified evidence.

Does C2721 affect EV charging?

Not yet established by verified evidence.

20. Sources & verification

Verified
Hyundai C2721: System Calibration Required LDWS (Lane Departure… | EV Diagnostics