Mercedes-Benz U041629
SIG_ESP_12 • U013187 • U044229 Cause Software status of IDC_GEN6 In some cases, a diagnosis session or a software update may generate fault codes that do not cause any restrictions
Quick answer
For the 2026 US Mercedes-Benz CLA-Class, DTC U041629 with error ID SIG_ESP_12 is listed in Mercedes-Benz bulletin LI54.71-P-080314 as a known potentially erroneous code that may be generated during PDI, a diagnostic session, or a vehicle software update. The bulletin states these codes may not cause restrictions in customer operation.
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 U041629 mean?
For the 2026 US Mercedes-Benz CLA-Class, DTC U041629 with error ID SIG_ESP_12 is listed in Mercedes-Benz bulletin LI54.71-P-080314 as a known potentially erroneous code that may be generated during PDI, a diagnostic session, or a vehicle software update. The bulletin states these codes may not cause restrictions in customer operation.
2. Technical explanation
Mercedes-Benz identifies the cause as the software status of IDC_GEN6. The bulletin lists U041629 / SIG_ESP_12 together with U013187 and U044229 among known erroneous DTCs. It applies to situations where codes are present as Active and Stored (A+S) or Stored (S) during PDI or after vehicle software updating.
3. What system is affected?
Driver-assistance-related fault reporting is referenced by the bulletin. A more specific affected system is not yet established by verified evidence.
4. How serious is this code?
Not yet established by verified evidence. The official bulletin states that these codes may occur without restrictions in customer operation when driver-assistance functions operate without restrictions and there is no persistent driver-assistance cluster message.
5. Symptoms you may notice
- DTC U041629 with error ID SIG_ESP_12 may be recorded as Active and Stored (A+S) or Stored (S).
- The code may occur during PDI, a diagnostic session, or after a vehicle software update.
- A persistent driver-assistance cluster message is relevant to the bulletin’s remedy criteria, but whether one is present in an individual vehicle is not established by the code alone.
6. Possible causes
- Mercedes-Benz bulletin LI54.71-P-080314 identifies the software status of IDC_GEN6.
- A diagnosis session may generate the code.
- A vehicle software update may generate the code.
7. Can I still drive the vehicle?
Not yet established by verified evidence for every condition. The bulletin states that the codes may not cause customer-operation restrictions if all driver-assistance functions operate without restrictions and there is no persistent driver-assistance cluster message.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Check whether all driver-assistance functions operate without restrictions.
- Check whether a driver-assistance message persists in the instrument cluster.
- Provide the stored code and the timing of any diagnostic session or software update to an authorized Mercedes-Benz service provider.
10. Step-by-step troubleshooting
- Mercedes-Benz’s verified bulletin criteria reference unrestricted operation of all driver-assistance functions.
- Mercedes-Benz’s verified bulletin criteria reference absence of a persistent driver-assistance cluster message.
- Further diagnostic or repair steps are not established by the supplied verified evidence.
11. When to contact service
Contact an authorized Mercedes-Benz service provider if driver-assistance functions are restricted, a driver-assistance cluster message persists, or confirmation of the bulletin procedure is needed.
12. What the service center may check
- Confirm whether the vehicle is a 2026 Mercedes-Benz CLA-Class for the US market.
- Review whether the DTC occurred during PDI, a diagnostic session, or following a software update.
- Verify whether all driver-assistance functions operate without restrictions.
- Verify whether there is a persistent driver-assistance cluster message.
- Review Mercedes-Benz bulletin LI54.71-P-080314.
13. Possible repair or resolution
- The supplied verified evidence does not establish a specific repair.
- The bulletin identifies circumstances in which the listed DTCs may be erroneous and may not cause customer-operation restrictions.
14. Affected vehicles
- Mercedes-Benz CLA-Class · 2026 · US
15. Related TSBs / service bulletins
- Mercedes-Benz LI54.71-P-080314, reported by NHTSA as Manufacturer Communication 11030291, published March 25, 2026.
- Mercedes-Benz LI54.71-P-080314, reported by NHTSA as Manufacturer Communication 11031206, published April 4, 2026.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA manufacturer communication: LI54.71-P-080314. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11030291
19. Frequently asked questions
What does U041629 / SIG_ESP_12 mean on the 2026 Mercedes-Benz CLA-Class?
Mercedes-Benz lists it as a known potentially erroneous DTC in bulletin LI54.71-P-080314. The bulletin identifies the cause as the software status of IDC_GEN6.
Can this code appear after a software update?
Yes. The bulletin states that it may occur after updating vehicle software, and that a diagnosis session may also generate fault codes.
Does this code always mean a driving restriction?
No. The bulletin states that these codes may not cause restrictions in customer operation when all driver-assistance functions operate without restrictions and there is no persistent driver-assistance cluster message.
Is there a verified charging impact?
Not yet established by verified evidence.