Fault Family System: Powertrain (P-Codes) 7 SAE Codes

Charging System Precharge Contactor

Diagnostic & Technical Explanation

Code P0E6A sets when the battery management system commands the onboard charger's precharge contactor — which limits inrush current through a resistor before the charger's main contactors close at the start of a session — open or closed, and its feedback or the resulting voltage ramp does not confirm the commanded state. The most common physical causes are a failed precharge resistor inside the charger, a coil winding failure in the small precharge contactor itself, and a corroded coil-driver connector. Because this contactor only ever carries brief, current-limited precharge energy, its wear pattern differs from the charger's full-current main contactors — light erosion rather than heavy pitting or welding.

These 7 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 7 times.

Codes in this family (7)

Code	Definition	Repair coverage
P0E6A	Battery Charging System Precharge Contactor Circuit	3 ranked fixes
P0E6B	Battery Charging System Precharge Contactor Circuit Stuck Closed	3 ranked fixes
P0E6C	Battery Charging System Precharge Contactor Circuit Stuck Open	3 ranked fixes
P0E6D	Battery Charging System Precharge Contactor Control Circuit/Open	3 ranked fixes
P0E6E	Battery Charging System Precharge Contactor Control Circuit Range/Performance	3 ranked fixes
P0E6F	Battery Charging System Precharge Contactor Control Circuit Low	3 ranked fixes
P0E70	Battery Charging System Precharge Contactor Control 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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