Code Definition

P0A55 — Drive motor B current sensor signal error

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

About P0A55

P0A55 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 P0A55 is stored, the module has detected 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 P0A55 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 motor control module uses a current sensor to measure the phase current flowing to Drive Motor B for accurate torque control and to protect the inverter and motor from overcurrent. DTC P0A55 sets when the module detects an invalid, erratic, or implausible signal from the Drive Motor B current sensor, such as a corrupted waveform, inconsistent levels, or values that conflict with the commanded current. This typically results from a wiring or connector fault, a reference or ground problem, signal interference, or a failed sensor. Because the inverter cannot rely on the reported current, it l...

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