Fault Family System: Powertrain (P-Codes) 19 SAE Codes

Trans Fluid Pump Phase Current

Diagnostic & Technical Explanation

Code P0B00 sets when the electric transmission fluid pump motor's inverter phase-current sensors report a phase current missing, imbalanced, or exceeding the value commanded for the requested hydraulic flow rate. The most common physical causes are a corroded or loose phase-lead connection at the pump's small integrated inverter, a damaged phase-current sensor, and a shorted or open turn in the pump motor's winding, sometimes accelerated by transmission-fluid contamination reaching the motor's seals. This is an electrical winding/inverter fault distinct from the hydraulic supply-pressure fault covered elsewhere in this pump's family group.

These 19 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 19 times.

Codes in this family (19)

Code	Definition	Repair coverage
P0B00	Electric/Auxiliary Transmission Fluid Pump Motor Phase U Current	3 ranked fixes
P0B01	Electric/Auxiliary Transmission Fluid Pump Motor Phase U Current Low	3 ranked fixes
P0B02	Electric/Auxiliary Transmission Fluid Pump Motor Phase U Current High	3 ranked fixes
P0B03	Electric/Auxiliary Transmission Fluid Pump Motor Phase V Current	3 ranked fixes
P0B04	Electric/Auxiliary Transmission Fluid Pump Motor Phase V Current Low	3 ranked fixes
P0B05	Electric/Auxiliary Transmission Fluid Pump Motor Phase V Current High	3 ranked fixes
P0B06	Electric/Auxiliary Transmission Fluid Pump Motor Phase W Current	3 ranked fixes
P0B07	Electric/Auxiliary Transmission Fluid Pump Motor Phase W Current Low	3 ranked fixes
P0B08	Electric/Auxiliary Transmission Fluid Pump Motor Phase W Current High	3 ranked fixes
P0C20	Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit/Open	3 ranked fixes
P0C21	Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit Low	3 ranked fixes
P0C22	Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit High	3 ranked fixes
P0C26	Electric/Auxiliary Transmission Fluid Pump A Motor Current	3 ranked fixes
P0C27	Electric/Auxiliary Transmission Fluid Pump A Motor Current Low	3 ranked fixes
P0C28	Electric/Auxiliary Transmission Fluid Pump A Motor Current High	3 ranked fixes
P276D	Electric/Auxiliary Transmission Fluid Pump B Motor Current	3 ranked fixes
P276E	Electric/Auxiliary Transmission Fluid Pump B Motor Current Low	3 ranked fixes
P276F	Electric/Auxiliary Transmission Fluid Pump B Motor Current High	3 ranked fixes
P287D	Electric/Auxiliary Transmission Fluid Pump Motor Torque Out Of Range	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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