What does code P1789 mean?

Q: What does code P1789 mean?

Pressure Control Solenoid B Circuit Shorted. P1789 on Mazda vehicles indicates that the transmission control module (TCM) has detected a short circuit in the electrical circuit for pressure control solenoid B, which is used to regulate hydraulic pressure inside the automatic transmission. The TCM monitors the solenoid's command wire for abnormal current flow or voltage and sets this code when the circuit is grounded or shorted to power.

DTC codes / Mazda codes / P1789

P1789 · MazdaPressure Control Solenoid B Circuit Shorted

P1789 on Mazda vehicles indicates that the transmission control module (TCM) has detected a short circuit in the electrical circuit for pressure control solenoid B, which is used to regulate hydraulic pressure inside the automatic transmission. The TCM monitors the solenoid's command wire for abnormal current flow or voltage and sets this code when the circuit is grounded or shorted to power.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

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