Fault Family System: Powertrain (P-Codes) 4 SAE Codes

Battery SOC Performance

Diagnostic & Technical Explanation

Code P00FD (Battery B State of Charge Performance) sets when the vehicle's battery monitoring system determines the secondary/auxiliary battery's state of charge is not tracking expected charge/discharge behavior. Causes are a weak or aging battery, a poor ground/terminal connection, or a charging system fault specific to that battery circuit.

These 4 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 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P00FD	Battery B State of Charge Performance	3 ranked fixes
P057F	Battery A State of Charge Performance	3 ranked fixes
P0A7D	Hybrid/EV Battery Pack State of Charge Low	3 ranked fixes
P0C30	Hybrid/EV Battery Pack State of Charge 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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