Mercedes-Benz U0420E2
SYS_EPS_22 • U041629 with error ID: SIG_ESP_12 • U013187 • U044229 Cause Software status of IDC_GEN6 In some cases, a diagnosis session or a software update may generate fault code
Quick answer
For a 2026 Mercedes-Benz CLA-Class (US), DTC U0420E2 with error ID SYS_EPS_22 is identified in an official Mercedes-Benz communication as a known potentially erroneous code that can be generated during PDI, a diagnostic session, or a vehicle software update because of the IDC_GEN6 software status.
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1. What does U0420E2 mean?
For a 2026 Mercedes-Benz CLA-Class (US), DTC U0420E2 with error ID SYS_EPS_22 is identified in an official Mercedes-Benz communication as a known potentially erroneous code that can be generated during PDI, a diagnostic session, or a vehicle software update because of the IDC_GEN6 software status.
2. Technical explanation
Mercedes-Benz communication LI54.71-P-080314 lists U0420E2 / SYS_EPS_22 among known erroneous DTCs. The communication states that, in some cases, a diagnostic session or software update may generate fault codes that do not cause restrictions in customer operation. This evidence does not establish that every occurrence of U0420E2 is harmless; the bulletin’s stated condition includes that all driver-assistance functions operate without restrictions and that no persistent messages are present.
3. What system is affected?
Not yet established by verified evidence. The verified communication associates the condition with the software status of IDC_GEN6 and identifies the error ID as SYS_EPS_22.
4. How serious is this code?
Not yet established by verified evidence. The official communication says these codes may be erroneous and may not cause restrictions in customer operation under its stated conditions.
5. Symptoms you may notice
- The code may be present as active-and-stored (A+S) or stored (S), including during PDI or after a vehicle software update.
- A diagnostic session or software update may generate the code.
- The communication states that such generated codes may not cause restrictions in customer operation.
6. Possible causes
- Software status of IDC_GEN6.
- A diagnostic session may generate the fault code in some cases.
- A vehicle software update may generate the fault code in some cases.
7. Can I still drive the vehicle?
Not yet established by verified evidence. The official communication states that the generated codes may not restrict customer operation when all driver-assistance functions operate without restrictions and no persistent messages are present.
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.
- Note whether any vehicle messages are persistent.
- Have the vehicle evaluated using the applicable Mercedes-Benz diagnostic process if the bulletin conditions are not met or if concerns persist.
10. Step-by-step troubleshooting
- Confirm whether U0420E2 / SYS_EPS_22 occurred during PDI, a diagnostic session, or after a vehicle software update.
- Confirm whether the DTC is active-and-stored (A+S) or stored (S).
- Check whether all driver-assistance functions operate without restrictions.
- Check for persistent vehicle messages.
- The complete remedy procedure is 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, persistent messages are present, or the code remains a concern. The supplied evidence does not establish a customer-performed repair.
12. What the service center may check
- Review Mercedes-Benz communication LI54.71-P-080314.
- Verify whether the DTC was generated during PDI, a diagnostic session, or a software update.
- Verify that all driver-assistance functions operate without restrictions.
- Check for persistent vehicle messages.
- Apply the manufacturer procedure only where its stated conditions are met; the detailed procedure is not included in the supplied evidence.
13. Possible repair or resolution
- The verified communication identifies IDC_GEN6 software status as the cause and describes U0420E2 as a potentially erroneous DTC generated during diagnostics or updating.
- The exact repair or clearing procedure is not established by the supplied verified evidence.
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.
- The communication applies in the supplied evidence to the 2026 Mercedes-Benz CLA-Class in the United States.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official source: NHTSA manufacturer communications 11030291 and 11031206, both referencing Mercedes-Benz 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 U0420E2 mean for this Mercedes-Benz CLA-Class?
The verified Mercedes-Benz communication lists U0420E2 with error ID SYS_EPS_22 as a known potentially erroneous DTC associated with IDC_GEN6 software status.
Can a software update create U0420E2?
Yes. The official communication states that, in some cases, a diagnosis session or vehicle software update may generate fault codes, including U0420E2.
Does U0420E2 always mean there is a vehicle fault?
No. The communication identifies it as a known erroneous DTC in some cases. Whether a particular vehicle has another issue is not established by the supplied evidence.
Is there a recall for U0420E2?
Not yet established by verified evidence.