What does code P1781 mean?

Q: What does code P1781 mean?

Transmission 4x4 Low Switch Out Of Range Fault. P1781 on Mazda vehicles indicates that the transmission control module (TCM) has detected an out-of-range signal from the 4x4 low range switch, which is part of the transfer case selector system. The TCM expects the switch to report either a clear 4x4 low engagement or a clear disengagement, but the voltage or resistance it sees falls outside the valid window, so it flags the circuit as faulty.

DTC codes / Mazda codes / P1781

P1781 · MazdaTransmission 4x4 Low Switch Out Of Range Fault

P1781 on Mazda vehicles indicates that the transmission control module (TCM) has detected an out-of-range signal from the 4x4 low range switch, which is part of the transfer case selector system. The TCM expects the switch to report either a clear 4x4 low engagement or a clear disengagement, but the voltage or resistance it sees falls outside the valid window, so it flags the circuit as faulty.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.