Code Definition

P0B08 — Auxiliary Transmission Fluid Pump Motor Phase W Current High

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

About P0B08

P0B08 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 P0B08 is stored, the module has detected a signal or supply voltage higher 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 P0B08 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 auxiliary transmission fluid pump is a 3 phase brushless DC motor used on hybrid, stop start, and some dual clutch transmission equipped vehicles to maintain transmission line pressure when the main engine driven pump is stopped or insufficient. The Transmission Control Module (TCM) or Powertrain Control Module (PCM) drives each of the three motor phases (U, V, and W) through a power stage and monitors the current draw on each phase in real time. DTC P0B08 is logged when the module detects that the current drawn by Phase W has exceeded its calibrated high threshold for a defined duration. ...

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