Standard
OBD-II / SAE J2012
P1781
Fault code
P1781
Meaning
4x4 Low Switch is Out of Self-Test Range
System
Powertrain — engine, transmission, emissions
Scope
Manufacturer-specific code — FORD, LINCOLN, MAZDA, MERCEDES, MERCURY, NISSAN and 2 more
About this code
P1781 is the diagnostic trouble code a scanner reads as "4x4 Low Switch is Out of Self-Test Range", in the powertrain system. Trouble codes name the symptom the car reported, not the part that failed — the same code can have several causes, and many codes read differently on different makes. This is a reference index, not repair advice; have the car diagnosed before replacing anything.