B1601 — PATS Received Incorrect Key-Code From Ignition Key Transponder

What it means

B1601 is an OBD-II diagnostic trouble code: PATS Received Incorrect Key-Code From Ignition Key Transponder.

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.