BMW D796DC

1. What does D796DC mean?

BMW code D796DC means: “No message (- 0x91), receiver CCU, transmitter EME.” Verified evidence links it to a BMW service communication for the 2025 US BMW XM.

2. Technical explanation

The fault is stored in the CCU and identifies a missing message with identifier 0x91 expected from the EME. The supplied official BMW/NHTSA communication lists D796DC alongside D796D9 and D796D8 in this context.

3. What system is affected?

CCU receiver and EME transmitter communication. A more specific system classification is not yet established by verified evidence.

4. How serious is this code?

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

5. Symptoms you may notice

• The official communication references these displayed messages: “Restart not possible. Drivetrain fault.”
• “Call Roadside Assistance. Drivetrain failure.”
• “Information: Total error of vehicle.”
• The communication states that D796DC may be stored in the CCU.

6. Possible causes

• A missing message (-0x91) at the CCU from the EME is established by the fault definition.
• The underlying reason for the missing message is not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The supplied verified evidence does not establish whether the vehicle can be driven with D796DC.

8. Can I charge the vehicle?

Unknown. The supplied verified evidence does not establish whether charging is available or safe with D796DC.

9. What you can safely do

• If the vehicle displays “Restart not possible. Drivetrain fault,” “Call Roadside Assistance. Drivetrain failure,” or “Information: Total error of vehicle,” seek professional assistance.
• Do not attempt high-voltage component diagnosis or repair yourself.
• Have the vehicle evaluated by an authorized BMW service facility or qualified EV technician.

10. Step-by-step troubleshooting

1. Record all warning messages and whether the vehicle can restart.
2. Have a service facility retrieve and evaluate CCU and EME fault memory entries.
3. The communication also notes that other fault codes may be stored in the EGS, but the supplied evidence does not provide a complete verified list or diagnostic relationship.

11. When to contact service

Service evaluation is appropriate because the official communication associates this fault context with drivetrain-fault, roadside-assistance, and total-error messages. Whether service is mandatory is not explicitly established by the diagnostic record.

12. What the service center may check

• Retrieve fault memory from the CCU, including D796DC and any accompanying entries.
• Evaluate communication between the CCU and EME in accordance with BMW diagnostic procedures.
• Review any relevant EGS fault-memory entries referenced by the official communication.

13. Possible repair or resolution

• A specific repair or resolution for D796DC is not yet established by the supplied verified evidence.

14. Affected vehicles

• BMW XM · 2025 · US

15. Related TSBs / service bulletins

• NHTSA Manufacturer Communication 11030054: B610326, published March 5, 2026. It identifies D796DC as “No message (- 0x91), receiver CCU, transmitter EME” in a fault scenario involving the listed drivetrain-related messages.

16. Recall information

• No recall is established by the supplied verified evidence.

17. Official manufacturer information

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

• NHTSA: NHTSA Manufacturer Communication 11030054: B610326 · official_tsb

18. Related error codes

• D796D9 — Message (- 0x91) not up-to-date, receiver CCU, transmitter EME
• D796D8 — No message (- 0x91), receiver CCU, transmitter EME
• BA09B8 — listed in the official communication as a possible EGS fault-memory entry: “Inverter, Voltage Sensor, 5V HV AUX: Out of range or open connection detected”
• BA0A45 — listed in the official communication as a possible EGS fault-memory entry; its full description is not included in the supplied evidence.

19. Frequently asked questions

20. Sources & verification

• NHTSA: NHTSA Manufacturer Communication 11030054: B610326 · 2026