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 U0100: Lost Communication with ECM/PCM A: Description
2021 Ford Edge SE, 4WDSECTION Description
WARNING: This page is about a different car, the 2020 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 9 volts and there are no DTCs present inhibiting PSCM operation.
- DTC U0100:00 (Lost Communication with ECM/PCM A: No Sub Type Information) - This DTC is set if communications between the PSCM and the PCM fail. The PCM sends 2 message bundles to the PSCM. If 1 or both of these messages is missing for more than 5 seconds and the PSCM has not set DTC U0001:88, then the PSCM sets U0100:00.
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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.