Fault Family System: Powertrain (P-Codes) 10 SAE Codes

Proximity Detection Circuit

Diagnostic & Technical Explanation

Code P0D56 sets when the control module detects an implausible voltage on the charge cable's proximity-detection (PP) circuit — a separate low-voltage divider from the control pilot that confirms the cable is physically plugged in and its release button is not pressed, used to inhibit driving away while connected. The most common physical causes are a corroded or worn proximity contact inside the charge inlet, a chafed low-voltage PP wire between the inlet and the control module, and a charge cable whose plug-side proximity resistor or switch has failed. Because this circuit is independent of the pilot signal, a proximity fault can prevent driving away even when charging communication itself is healthy.

These 10 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 10 times.

Codes in this family (10)

Code	Definition	Repair coverage
P0D56	Proximity Detection Circuit A	3 ranked fixes
P0D57	Proximity Detection Circuit A Range/Performance	3 ranked fixes
P0D58	Proximity Detection Circuit A Low	3 ranked fixes
P0D59	Proximity Detection Circuit A High	3 ranked fixes
P0D5A	Proximity Detection Circuit A Intermittent/Erratic	3 ranked fixes
P2E87	Proximity Detection Circuit B	3 ranked fixes
P2E88	Proximity Detection Circuit B Range/Performance	3 ranked fixes
P2E89	Proximity Detection Circuit B Low	3 ranked fixes
P2E8A	Proximity Detection Circuit B High	3 ranked fixes
P2E8B	Proximity Detection Circuit B Intermittent/Erratic	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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