U0401 indicates “Invalid data received from ECM/PCM A.” This error typically relates to a communication issue between the Engine Control Module (ECM) or Powertrain Control Module (PCM) and other modules within the vehicle.
Possible causes of this error include poor connections, damaged or loose wires, faulty electrical connections, or a malfunctioning ECM/PCM. If you encounter this error, it’s advisable to visit a qualified mechanic or service center promptly to check the electrical connections and diagnose the exact cause of the problem.
Don’t ignore this error, as communication problems between modules can impact your vehicle’s performance and safety.
