The check engine light flashes on the dash, with multiple fault codes including a crankshaft position code (P0315-00) and CAN-bus no communication with EBCM (U0121-00). These codes reappear immediately after erasing.

Although the engine runs fine, the vehicle continually logs crankshaft position, CAN communication, and mass airflow/intake temperature related codes. Initial suspicion was on wiring, module connection faults, or low voltage supply during cranking.