Fault Family System: Powertrain (P-Codes) 14 SAE Codes

Control Pilot Charging Switch

Diagnostic & Technical Explanation

Code P0CF8 sets when the control pilot charging switch — the internal EVSE-side relay state the vehicle reads back during the J1772 handshake to confirm charging current is actually being enabled — does not read the expected open/closed state at the point in the sequence the control module expects it. The most common physical causes are a corroded or unseated connector at the switch-sense input, a chafed low-voltage signal wire between the charge inlet and the control module, and a worn switch contact that no longer makes reliably. Because this switch reports the EVSE's own enable state rather than a vehicle-side actuator, an intermittent fault here can also originate at the charging station rather than in the vehicle's wiring.

These 14 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 14 times.

Codes in this family (14)

Code	Definition	Repair coverage
P0CF8	Control Pilot Charging Switch A Circuit/Open	3 ranked fixes
P0CF9	Control Pilot Charging Switch A Range/Performance	3 ranked fixes
P0CFA	Control Pilot Charging Switch A Circuit Low	3 ranked fixes
P0CFB	Control Pilot Charging Switch A Circuit High	3 ranked fixes
P0CFC	Control Pilot Charging Switch A Intermittent/Erratic	3 ranked fixes
P0CFD	Control Pilot Charging Switch A Stuck Off	3 ranked fixes
P0CFE	Control Pilot Charging Switch A Stuck On	3 ranked fixes
P2DCE	Control Pilot Charging Switch B Circuit/Open	3 ranked fixes
P2DCF	Control Pilot Charging Switch B Range/Performance	3 ranked fixes
P2DD0	Control Pilot Charging Switch B Circuit Low	3 ranked fixes
P2DD1	Control Pilot Charging Switch B Circuit High	3 ranked fixes
P2DD2	Control Pilot Charging Switch B Intermittent/Erratic	3 ranked fixes
P2DD3	Control Pilot Charging Switch B Stuck Off	3 ranked fixes
P2DD4	Control Pilot Charging Switch B Stuck On	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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