Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC U0401: Invalid Data Received From ECM/Pcm "A"
2021 Ford Edge SE, 4WDSECTION DTC U0401: Invalid Data Received From ECM/Pcm "A"
WARNING: This page is about a different car, the 2021 Ford Transit Connect. However, it is still accessible from the selected car via links, so may be relevant.
| Failure | Action |
|---|---|
| 00 | This DTC sets if the SECM receives invalid data in any of the PCM messages. Using a diagnostic scan tool, RETRIEVE and DIAGNOSE all PCM and GWM DTCs. REFER to Electronic Engine Controls - 6.2L and/or Electronic Engine Controls - 6.7L Diesel and/or Electronic Engine Controls - 7.3L article or Module Communications Network article. If the diagnostic scan tool cannot communicate with the PCM or the GWM, REFER to Module Communications Network article. If no DTCs are set in the PCM or GWM, the concern may be intermittent. SET the ignition to OFF. DISCONNECT and INSPECT all PCM and GWM electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary. |
| 81 | This DTC sets if the SECM receives invalid data in any of the PCM messages. Using a diagnostic scan tool, RETRIEVE and DIAGNOSE all PCM and GWM DTCs. REFER to Electronic Engine Controls - 6.2L and/or Electronic Engine Controls - 6.7L Diesel and/or Electronic Engine Controls - 7.3L article or Module Communications Network article. If the diagnostic scan tool cannot communicate with the PCM or the GWM, REFER to Module Communications Network article. If no DTCs are set in the PCM or GWM, the concern may be intermittent. SET the ignition to OFF. DISCONNECT and INSPECT all PCM and GWM electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary. |
| 82 | This DTC sets if the SECM receives invalid data in any of the PCM messages. Using a diagnostic scan tool, RETRIEVE and DIAGNOSE all PCM and GWM DTCs. REFER to Electronic Engine Controls - 6.2L and/or Electronic Engine Controls - 6.7L Diesel and/or Electronic Engine Controls - 7.3L article or Module Communications Network article. If the diagnostic scan tool cannot communicate with the PCM or the GWM, REFER to Module Communications Network article. If no DTCs are set in the PCM or GWM, the concern may be intermittent. SET the ignition to OFF. DISCONNECT and INSPECT all PCM and GWM electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary. |
| 83 | This DTC sets if the SECM receives invalid data in any of the PCM messages. Using a diagnostic scan tool, RETRIEVE and DIAGNOSE all PCM and GWM DTCs. REFER to Electronic Engine Controls - 6.2L and/or Electronic Engine Controls - 6.7L Diesel and/or Electronic Engine Controls - 7.3L article or Module Communications Network article. If the diagnostic scan tool cannot communicate with the PCM or the GWM, REFER to Module Communications Network k article. If no DTCs are set in the PCM or GWM, the concern may be intermittent. SET the ignition to OFF. DISCONNECT and INSPECT all PCM and GWM electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.