What does code P1739 mean?

Q: What does code P1739 mean?

Automatic Transmission System Malfunction. P1739 is a Honda-specific code that the transmission control module (TCM) sets when it detects an internal fault within the automatic transmission system, typically a mismatch between expected and actual gear engagement or a failure in a solenoid or sensor circuit. The TCM monitors input and output speed sensors, solenoid resistance, and hydraulic pressure; when the calculated gear ratio or circuit feedback falls outside the programmed window, it commands a fail-safe mode and stores P1739.

DTC codes / Honda codes / P1739

P1739 · HondaAutomatic Transmission System Malfunction

P1739 is a Honda-specific code that the transmission control module (TCM) sets when it detects an internal fault within the automatic transmission system, typically a mismatch between expected and actual gear engagement or a failure in a solenoid or sensor circuit. The TCM monitors input and output speed sensors, solenoid resistance, and hydraulic pressure; when the calculated gear ratio or circuit feedback falls outside the programmed window, it commands a fail-safe mode and stores P1739.

SystemPowertrain

Code typeHonda specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

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