B1600 — PATS Ignition Key Transponder Signal Is Not Received

What it means

B1600 is an OBD-II diagnostic trouble code: PATS Ignition Key Transponder Signal Is Not Received.

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.