Fault Family System: Powertrain (P-Codes) 6 SAE Codes

Drive Motor Inverter Power Supply

Diagnostic & Technical Explanation

Code P0C0B sets when the drive motor inverter does not see the expected DC bus voltage at its input terminals once the control module closes the main contactors, or the voltage collapses under the heavy current draw the drive motor demands. Because this inverter must supply the highest current of any HV load, the most common physical causes are an open HV fuse or contactor upstream, a corroded or loose high-current HV bus-bar connection feeding this specific inverter, and a failed input capacitor bank that can no longer hold the bus steady under a hard-acceleration current transient.

These 6 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 6 times.

Codes in this family (6)

Code	Definition	Repair coverage
P0C0B	Drive Motor A Inverter Power Supply Circuit/Open	3 ranked fixes
P0C0C	Drive Motor A Inverter Power Supply Circuit Low	3 ranked fixes
P0C0D	Drive Motor A Inverter Power Supply Circuit High	3 ranked fixes
P0C0E	Drive Motor B Inverter Power Supply Circuit/Open	3 ranked fixes
P0C0F	Drive Motor B Inverter Power Supply Circuit Low	3 ranked fixes
P0C10	Drive Motor B Inverter Power Supply Circuit High	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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