EV Diagnostics
Verified EV diagnostic knowledge page

Audi Engine start system: fault

Engine start system: fault

DriveNot yet established by verified evidence. Although Audi’s supplied communications describe a condition with no functional issues, they do not provide a general driving-safety determination for this alert.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Audi service provider for diagnosis and to determine whether the applicable Audi technical-service communication applies.
Confidence90%

Quick answer

For covered Audi vehicles, this alert can appear with no functional issues. Audi technical-service communications associate it with a stored Comfort Control Module fault combination and provide a service procedure. Driveability and charging safety are not established by the supplied evidence.

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 Engine start system: fault mean?

For covered Audi vehicles, this alert can appear with no functional issues. Audi technical-service communications associate it with a stored Comfort Control Module fault combination and provide a service procedure. Driveability and charging safety are not established by the supplied evidence.

2. Technical explanation

The OEM alert is “Engine start system: fault.” Supplied NHTSA-hosted Audi manufacturer communications state that “Engine start system: fault” or “Power unit start system: fault” may appear in the instrument cluster while there are no functional issues. One supplied communication identifies the workshop finding as DTC B200047, “Control Module Faulty,” active/static, with symptom 65552, stored in the Comfort Control Module J393 (address word 0046). The supplied evidence does not establish that every occurrence of this alert has that same stored DTC combination or the same remedy.

3. What system is affected?

Comfort Control Module J393 (address word 0046) is identified in the supplied Audi technical-service communication for a specified DTC/symptom combination.

4. How serious is this code?

Unknown. The diagnostic record lists severity as unknown. Audi communications describe a covered condition in which there are no functional issues, but that does not establish severity for every vehicle or occurrence.

5. Symptoms you may notice

  • Instrument-cluster message: “Engine start system: fault.”
  • Instrument-cluster message: “Power unit start system: fault.”
  • For the condition described in the supplied Audi communications, there may be no functional issues.

6. Possible causes

  • For the specified service-bulletin condition, the Comfort Control Module J393 may store DTC B200047, “Control Module Faulty,” active/static, with symptom 65552.
  • The underlying cause beyond that documented fault combination is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. Although Audi’s supplied communications describe a condition with no functional issues, they do not provide a general driving-safety determination for this alert.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange evaluation by an authorized Audi service provider.
  • Record the exact instrument-cluster message and whether any functional issue is present.
  • Do not attempt high-voltage diagnosis or repair.

10. Step-by-step troubleshooting

  1. A service provider can check the Comfort Control Module J393 (address word 0046) for DTC B200047, active/static, with symptom 65552, as identified in the supplied Audi communication.
  2. Confirm whether the vehicle and its stored fault information match the applicable Audi technical-service communication.
  3. Further owner-performed troubleshooting is not established by verified evidence.

11. When to contact service

Contact an authorized Audi service provider for diagnosis and to determine whether the applicable Audi technical-service communication applies.

12. What the service center may check

  • Read fault memory in Comfort Control Module J393, address word 0046.
  • Check for DTC B200047, “Control Module Faulty,” active/static, and symptom 65552.
  • Verify vehicle applicability and follow the relevant Audi service communication when the documented condition is present.

13. Possible repair or resolution

  • Audi’s supplied communications indicate that a service procedure exists for the documented condition.
  • The specific repair or software action is not included in the supplied evidence; therefore, it is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Audi manufacturer communication A5724522074732_1, NHTSA ID 11005903, published July 27, 2024. It covers 2023–2024 Q8 e-tron-family vehicles as summarized in the supplied evidence and addresses this message with no functional issues.
  • Audi manufacturer communication A5724492071735_6, NHTSA ID 11005900, published July 3, 2024.
  • Audi manufacturer communication A5724412071735_5, NHTSA IDs 11002233 and 11002133, published May 14, 2024.
  • Audi manufacturer communication A5724382073135_4, NHTSA ID 10253755, published April 16, 2024.
  • Audi manufacturer communication A5724332071735_3, NHTSA ID 10250801, published February 23, 2024.
  • Audi manufacturer communication A5723202071735_2, NHTSA ID 10244500, published October 25, 2023. This communication identifies DTC B200047 active/static with symptom 65552 in J393 for the documented condition.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Audi manufacturer communications are supplied for this alert, including NHTSA ID 11005903: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=11005903

19. Frequently asked questions

Does this warning always mean the vehicle has a functional problem?

No. The supplied Audi communications describe a condition where the warning appears and there are no functional issues. This does not establish that every instance is free of functional issues.

Which module is identified in the Audi communication?

The supplied communication identifies the Comfort Control Module J393, address word 0046.

What stored code is identified for the documented condition?

DTC B200047, “Control Module Faulty,” active/static, with symptom 65552.

Is it safe to drive or charge?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi Engine start system: fault: Engine start system: fault | EV Diagnostics