P0719 Torque Converter/Brake Switch B Circuit Low

P0719 indicates a low signal in the torque converter or brake switch B circuit. The module sees the brake-related input stuck low or missing.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not focus only on the transmission; brake switch inputs can directly affect torque-converter and shift strategy.

Symptoms of P0719

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0719

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare brake switch B data with pedal movement, stop-lamp operation, cruise cancel behavior, and torque-converter clutch commands.
Check switch adjustment, power feed, ground, connector condition, pedal bracket movement, and wiring between modules.
Review whether the fault affects converter clutch release, shift scheduling, cruise control, or start/shift interlock behavior.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.