EV Diagnostics
Verified EV diagnostic knowledge page

Mercedes-Benz U05B8E1

range radar sensor calibration drive as outlined in LI54.71-P-078377. If one or more unsuccessful programming or coding operation occurs – observe SI54.21-P-0067S. 3. Disconnect XE

DriveNot yet established by verified evidence. The supplied diagnostic record lists safe-to-drive status as unknown.
ChargeNot yet established by verified evidence. The supplied diagnostic record lists safe-to-charge status as unknown.
ServiceContact an authorized Mercedes-Benz service provider. The verified communication relies on XENTRY Diagnosis and referenced Mercedes-Benz service instructions.
Confidence95%

Quick answer

For 2024–2025 Mercedes-Benz EQS vehicles in the U.S., DTC U05B8E1 may be present after a specified driver-assistance-system software update when the required short-range radar sensor calibration drive has not been completed. The cited Mercedes-Benz communication directs technicians to perform the calibration drive in LI54.71-P-078377 to clear the DTC.

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

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does U05B8E1 mean?

For 2024–2025 Mercedes-Benz EQS vehicles in the U.S., DTC U05B8E1 may be present after a specified driver-assistance-system software update when the required short-range radar sensor calibration drive has not been completed. The cited Mercedes-Benz communication directs technicians to perform the calibration drive in LI54.71-P-078377 to clear the DTC.

2. Technical explanation

The verified NHTSA-posted Mercedes-Benz manufacturer communication NCU - 2025050010 states that U05B8E1 may be stored after the control-unit software update because the calibration drive was not completed. It instructs use of XENTRY Diagnosis for the driver assistance system (N62/4 / SG-FAS) software update and states that the update is complete only after all control units have been programmed and coded successfully. It then directs a short-range radar sensor calibration drive according to LI54.71-P-078377 to clear U05B8E1. If programming or coding is unsuccessful, the communication directs technicians to SI54.21-P-0067S.

3. What system is affected?

Driver assistance system; the verified communication identifies N62/4, Driver assistance system (SG-FAS), and refers to short-range radar sensor calibration.

4. How serious is this code?

Not yet established by verified evidence. The supplied diagnostic record lists severity as unknown.

5. Symptoms you may notice

  • U05B8E1 may be present after the specified software update when the calibration drive has not been completed.
  • No driver-visible symptoms are established by the supplied verified evidence.

6. Possible causes

  • Following the referenced software update, the short-range radar sensor calibration drive was not completed.
  • No additional causes are established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. The supplied diagnostic record lists safe-to-drive status as unknown.

8. Can I charge the vehicle?

Not yet established by verified evidence. The supplied diagnostic record lists safe-to-charge status as unknown.

9. What you can safely do

  • Have a qualified Mercedes-Benz service provider evaluate the vehicle using XENTRY Diagnosis.
  • Do not assume the DTC is cleared until the required programming/coding and calibration procedure has been completed successfully.

10. Step-by-step troubleshooting

  1. Verify whether the vehicle received the driver-assistance-system control-unit software update described in NCU - 2025050010.
  2. Using XENTRY Diagnosis, a qualified technician can follow the referenced control-unit update guidance for N62/4, Driver assistance system (SG-FAS).
  3. Confirm that all control units were programmed and coded successfully; the communication states the update is complete only after this occurs.
  4. If U05B8E1 remains after the update, perform the short-range radar sensor calibration drive specified in LI54.71-P-078377.
  5. If one or more programming or coding operations are unsuccessful, follow SI54.21-P-0067S.

11. When to contact service

Contact an authorized Mercedes-Benz service provider. The verified communication relies on XENTRY Diagnosis and referenced Mercedes-Benz service instructions.

12. What the service center may check

  • Check for U05B8E1 in the driver assistance system.
  • Perform or verify the specified N62/4 (SG-FAS) control-unit software update using XENTRY Diagnosis.
  • Verify successful programming and coding of all control units.
  • Carry out the short-range radar sensor calibration drive per LI54.71-P-078377 to clear applicable DTCs.
  • If programming or coding fails, consult SI54.21-P-0067S.

13. Possible repair or resolution

  • Complete the referenced software update, with all control units successfully programmed and coded.
  • Complete the short-range radar sensor calibration drive in LI54.71-P-078377 to clear U05B8E1 when it is present due to an incomplete calibration drive.
  • No component replacement or other repair is established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication PDF 11019812 / NCU - 2025050010, published June 6, 2025. It identifies U05B8E1 as one of several DTCs that may remain after the software update if the calibration drive is not completed.
  • Referenced Mercedes-Benz procedures: LI54.71-P-078377 for the short-range radar sensor calibration drive; SI54.21-P-0067S for unsuccessful programming or coding operations.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified official source: NHTSA-posted Mercedes-Benz Manufacturer Communication PDF 11019812, NCU - 2025050010: https://static.nhtsa.gov/odi/tsbs/2025/MC-11019812-0001.pdf. Verified applicability: 2024–2025 Mercedes-Benz EQS, U.S.

19. Frequently asked questions

What does U05B8E1 mean for a 2024–2025 Mercedes-Benz EQS?

The verified Mercedes-Benz communication says this DTC may be present after the specified software update because the required short-range radar sensor calibration drive was not completed.

How is U05B8E1 cleared according to the verified communication?

The communication directs technicians to perform the short-range radar sensor calibration drive outlined in LI54.71-P-078377.

Is U05B8E1 proof that a radar sensor must be replaced?

No. The supplied verified evidence does not establish sensor replacement as a required repair.

Is it safe to drive or charge with U05B8E1?

Not yet established by verified evidence. The diagnostic record marks both safe-to-drive and safe-to-charge status as unknown.

20. Sources & verification

Verified
Mercedes-Benz U05B8E1: range radar sensor calibration drive as… | EV Diagnostics