U1798 — SCP (J1850) Lack of Acknowledgment for External Access (Doors)

What it means

U1798 is an OBD-II diagnostic trouble code: SCP (J1850) Lack of Acknowledgment for External Access (Doors).

Typical fix

Confirm the code with an OBD-II scanner, then inspect the component or circuit named above. Consult a vehicle-specific service manual for the full diagnostic and repair procedure.