Code Definition

P0A19 — Motor torque sensor signal low

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

About P0A19

P0A19 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 P0A19 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

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 P0A19 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

This code is set when the powertrain control module (PCM) or hybrid control module (HCU) detects a low voltage condition in the motor torque sensor signal. A low signal may indicate a short to ground, wiring issue, or a failing torque sensor. This can affect motor torque calculation, potentially leading to reduced power output, improper torque control, or failsafe mode activation.

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