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BMW D796D9

Message (- 0x91) not up-to-date, receiver CCU, transmitter EME

DriveUnknown. The diagnostic record does not establish whether it is safe to drive. Follow any active vehicle warning message; the cited communication includes warnings ranging from “You can continue driving” to “Call Roadside Assistance.”
ChargeUnknown. The supplied evidence does not establish whether charging is safe or available with D796D9.
ServiceContact a BMW service facility for diagnosis. If the vehicle displays “Call Roadside Assistance. Drivetrain failure.”, contact roadside assistance.
Confidence97%

Quick answer

BMW OEM fault code D796D9 identifies an outdated message (- 0x91) received by the CCU from the EME. Verified applicability is the 2025 BMW XM in the US.

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 D796D9 mean?

BMW OEM fault code D796D9 identifies an outdated message (- 0x91) received by the CCU from the EME. Verified applicability is the 2025 BMW XM in the US.

2. Technical explanation

The verified wording for D796D9 is: “Message (- 0x91) not up-to-date, receiver CCU, transmitter EME.” This describes a message-timing or message-freshness fault recorded by the CCU, with the EME identified as the transmitter. The supplied evidence does not establish the underlying failed component or a specific repair.

3. What system is affected?

CCU receiver and EME transmitter communication, as identified by the fault description.

4. How serious is this code?

Unknown. The diagnostic record does not establish a severity level.

5. Symptoms you may notice

  • The cited BMW/NHTSA manufacturer communication references possible displayed messages including: “You can continue driving. High-voltage system.”
  • The communication also references: “You can continue driving. Drivetrain.”
  • The communication also references: “Restart not possible. Drivetrain fault.”
  • The communication also references: “Call Roadside Assistance. Drivetrain failure.”
  • The communication also references: “Information: Total error of vehicle.”
  • The supplied evidence does not establish which, if any, of these messages will occur specifically with D796D9 alone.

6. Possible causes

  • Not yet established by verified evidence. The available evidence identifies an outdated message received by the CCU from the EME, but does not verify a root cause.

7. Can I still drive the vehicle?

Unknown. The diagnostic record does not establish whether it is safe to drive. Follow any active vehicle warning message; the cited communication includes warnings ranging from “You can continue driving” to “Call Roadside Assistance.”

8. Can I charge the vehicle?

Unknown. The supplied evidence does not establish whether charging is safe or available with D796D9.

9. What you can safely do

  • Read and follow the warning message currently displayed by the vehicle.
  • If the vehicle displays “Call Roadside Assistance. Drivetrain failure.”, contact roadside assistance.
  • Arrange BMW service diagnosis because the cited official communication associates D796D9 with CCU fault-memory entries.
  • Do not attempt high-voltage system repairs.

10. Step-by-step troubleshooting

  1. Have a qualified BMW service facility retrieve and evaluate CCU fault memory.
  2. Check for other stored faults as part of professional diagnosis. The cited communication states that other fault codes may be stored in the EGS, but the supplied excerpt does not establish their complete list or diagnostic relationship.

11. When to contact service

Contact a BMW service facility for diagnosis. If the vehicle displays “Call Roadside Assistance. Drivetrain failure.”, contact roadside assistance.

12. What the service center may check

  • Retrieve fault memory from the CCU and confirm whether D796D9 is present.
  • Evaluate related stored faults using BMW service procedures. Further specific checks are not established by the supplied verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 11030054: B610326, published March 5, 2026. The supplied excerpt lists D796D9 among CCU fault-memory entries and references several possible vehicle warning messages. The excerpt does not provide the full bulletin procedure or a verified repair resolution.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication 11030054: B610326, published 2026-03-05. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11030054

19. Frequently asked questions

What does BMW code D796D9 mean?

It means: “Message (- 0x91) not up-to-date, receiver CCU, transmitter EME.”

Which vehicle is verified as applicable?

The supplied applicability record verifies the 2025 BMW XM for the US market.

Can I drive with D796D9?

Not yet established by verified evidence. Follow the active vehicle message; the cited communication includes both continue-driving and roadside-assistance warnings.

Does D796D9 confirm a failed EME or CCU?

No. The evidence identifies the EME as transmitter and CCU as receiver, but does not establish a failed component.

20. Sources & verification

Verified
BMW D796D9: Message (- 0x91) not up-to-date, receiver CCU, transmitter… | EV Diagnostics