What is the U0105 error code?

The Engine Control Module (ECM) monitors the data bus for periodic "heartbeat" messages or specific data packets emitted by the Fuel Injector Control Module (FICM). If these expected messages are absent for a manufacturer-defined timeout duration, the ECM identifies a communication timeout and logs the fault. This logic relies on the continuous availability of the high-speed Controller Area Network (CAN) and stable module power.

What does U0105 mean?

This diagnostic code indicates that the primary engine computer has lost its digital connection with the module responsible for operating the fuel injectors. Because these two systems must work in perfect synchronization to deliver fuel, this fault typically prevents the engine from starting or causes it to shut down immediately. The break in communication usually stems from an interruption in the electrical supply or a failure in the high-speed data network.

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