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2021 FORD MUSTANG MACH-E
Extended Range Dual Motor AWD•AWD•AUTOMATIC•ev
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor321Torque3776Fluid5DTC769Battery1Maintenance0Recalls6
U0300moderate severityNetwork

Internal Control Module Software Incompatibility

on 2021 Ford Mustang Mach-E Extended Range Dual Motor AWD · AWD

What this code means

Software version mismatch between communicating modules causing data interpretation errors.

Symptoms

  • Warning lights on
  • Systems behaving erratically
  • Features not working correctly after update
  • Communication errors between modules

Common causes

  • Module software not updated together
  • Partial software update
  • Incorrect software version flashed
  • Aftermarket module with wrong software

Diagnostic steps

  1. Check software versions on all modules
  2. Compare to required version table
  3. Perform full vehicle software update
  4. Check for TSBs regarding software updates

Repair notes

Perform complete vehicle software update. All related modules must be updated together.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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