Code Definition

P0719 — Torque Converter/Brake Switch B Circuit Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0719

P0719 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0719 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0719 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0719 code is set when the Engine Control Module (ECM) detects a low voltage condition in the Torque Converter Clutch (TCC) / Brake Switch B circuit. This switch is integral to the operation of the transmission's torque converter clutch, particularly in relation to the brake system. It signals to the ECM when the brake is applied, influencing the engagement and disengagement of the torque converter clutch. A low circuit condition typically indicates a short to ground or a fault within the switch or its wiring. This can lead to issues with the TCC operation, such as improper engagement or d...

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