What is the U0106 error code?

The Engine Control Module (ECM) monitors the communication network for periodic status messages from the Glow Plug Control Module (GPCM). If the expected data frames are not received within a calibrated, manufacturer-defined timeframe, a communication timeout is recorded. The fault triggers when the ECM fails to receive multiple consecutive scheduled messages on the high-speed data bus.

What does U0106 mean?

This code indicates that the vehicle's engine computer has lost its digital connection with the module responsible for operating the glow plugs. In diesel engines, this often results in hard starting during cold weather and increased emissions until the engine reaches operating temperature. It signals a breakdown in the communication network rather than a direct failure of the glow plugs themselves.

System Faults

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