What causes P1781 on a Ford?

Self-test run without shifting into 4x4 Low when prompted Failed 4x4 Low switch Stuck transfer case shift motor Wiring fault to the switch GEM/4WD module fault

How do I fix P1781 on a Ford?

Re-run the self-test and follow the 4x4 Low prompt Test transfer case motor operation in all ranges Check switch continuity in 4x4 Low Inspect switch wiring Service the shift motor or switch per results

P1781 4x4 Low Switch Out of Self-Test Range

Q: What does P1781 mean on a Ford?

P1781 — 4x4 Low Switch Out of Self-Test Range. Applies to F-150, Super Duty, Explorer, Ranger with electronic shift 4WD.

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Super Duty, Explorer, Ranger with electronic shift 4WD

What does P1781 mean on a Ford?

P1781 — 4x4 Low Switch Out of Self-Test Range. This Ford-enhanced code applies to F-150, Super Duty, Explorer, Ranger with electronic shift 4WD.

Common causes of P1781

Self-test run without shifting into 4x4 Low when prompted
Failed 4x4 Low switch
Stuck transfer case shift motor
Wiring fault to the switch
GEM/4WD module fault

How to fix P1781

Re-run the self-test and follow the 4x4 Low prompt
Test transfer case motor operation in all ranges
Check switch continuity in 4x4 Low
Inspect switch wiring
Service the shift motor or switch per results