Code Definition

P0A73 — Generator A phase V current low

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

About P0A73

P0A73 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 P0A73 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 P0A73 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

Generator A produces three phase AC in its stator windings, which is rectified to DC to charge the battery and support the electrical system, and the charging control module monitors all three phases to keep output balanced. DTC P0A73 sets when the current in Phase V is consistently below its calibrated minimum threshold during charging operation. A low reading indicates the Phase V current path is restricted, typically by an open or high resistance stator winding, a degraded internal connection, a poor phase or sensor connection, or an open rectifier diode, though a faulty current sensor can ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts