Code Definition

P0A24 — Alternator torque sensor signal low

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

About P0A24

P0A24 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 P0A24 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 P0A24 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 powertrain control module monitors the alternator torque sensor, which reports the mechanical torque transferred to the alternator on systems using an integrated starter generator. DTC P0A24 sets when the module detects the sensor signal voltage has fallen below the calibrated minimum valid threshold and remained there for a calibrated duration. A signal low condition almost always reflects a short to ground, an open in the signal or supply circuit, or a failed sensor rather than a real low torque value. When the code is set the vehicle may show impaired charging and torque management, uns...

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