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.
ETHERNET Module Communications Network DTCS
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
| DTC | Description | Action |
|---|---|---|
| U2400:81 | Ethernet failure with Gateway Module A (GWM): Invalid Serial Data Received | GO to Pinpoint Test A |
| U2400:92 | Ethernet failure with Gateway Module A (GWM): Performance or Incorrect Operation | GO to Pinpoint Test A |
| U2401:00 | Ethernet failure with Accessory Protocol Module (APIM): No Sub Type Information | GO to Pinpoint Test B |
| U2401:81 | Ethernet failure with Accessory Protocol Module (APIM): Invalid Serial Data Received | GO to Pinpoint Test A |
| U2401:92 | Ethernet failure with Accessory Protocol Module (APIM): Performance or Incorrect Operation | GO to Pinpoint Test A |
| U2402:00 | Ethernet Failure with Telematic Control Unit Module (TCU): No Sub Type Information | GO to Pinpoint Test B |
| U2402:81 | Ethernet Failure with Telematic Control Unit Module (TCU): Invalid Serial Data Received | GO to Pinpoint Test A |
| U2402:92 | Ethernet Failure with Telematic Control Unit Module (TCU): Performance or Incorrect Operation | GO to Pinpoint Test A |
Use the Manual With the Right Hardware
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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.
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