P1636 — Theft Deterrent Start Enable Signal Not Correct/ Main Relay Malfunction (Power Hold)

What it means

P1636 is an OBD-II diagnostic trouble code: Theft Deterrent Start Enable Signal Not Correct/ Main Relay Malfunction (Power Hold).

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.