P1783 Transfer Neutral Switch Circuit

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: 4Runner, Tacoma, Land Cruiser

What does P1783 mean on a Toyota?

P1783 — Transfer Neutral Switch Circuit. This Toyota-enhanced code applies to 4Runner, Tacoma, Land Cruiser.

Common causes of P1783

Failed transfer neutral switch
Open neutral circuit
Stuck transfer case between ranges
Corroded connector
Module fault

How to fix P1783

Cycle the transfer case fully
Test the neutral switch
Inspect wiring and connector
Verify module sees neutral
Replace the switch per findings