Fault Family System: Powertrain (P-Codes) 20 SAE Codes

EVAP LDP Circuit

Diagnostic & Technical Explanation

Code P2400 (EVAP System Leak Detection Pump Control Circuit/Open) sets when the ECM detects an open, shorted, or out-of-range electrical condition on the leak detection pump's control driver circuit or its pressure/position sense return circuit, rather than a mechanical pump or filter problem. Causes are a blown LDP fuse or failed relay, a corroded pump connector, chafed harness wiring between the pump and the PCM, or a failed pump driver/sense circuit inside the module itself.

These 20 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 20 times.

Codes in this family (20)

Code	Definition	Repair coverage
P2400	EVAP System Leak Detection Pump Control Circuit/Open	4 ranked fixes
P2401	EVAP System Leak Detection Pump Control Circuit Low	4 ranked fixes
P2402	EVAP System Leak Detection Pump Control Circuit High	4 ranked fixes
P2403	EVAP System Leak Detection Pump Sense Circuit/Open	4 ranked fixes
P2404	EVAP System Leak Detection Pump Sense Circuit Range/Performance	4 ranked fixes
P2405	EVAP System Leak Detection Pump Sense Circuit Low	4 ranked fixes
P2406	EVAP System Leak Detection Pump Sense Circuit High	4 ranked fixes
P2407	EVAP System Leak Detection Pump Sense Circuit Intermittent/Erratic	4 ranked fixes
P240A	EVAP System Leak Detection Pump Heater Control Circuit/Open	4 ranked fixes
P240B	EVAP System Leak Detection Pump Heater Control Circuit Low	4 ranked fixes
P240C	EVAP System Leak Detection Pump Heater Control Circuit High	4 ranked fixes
P24B8	EVAP System Leak Detection Pump Pressure Sensor Circuit	4 ranked fixes
P24B9	EVAP System Leak Detection Pump Pressure Sensor Circuit Range/Performance	4 ranked fixes
P24BA	EVAP System Leak Detection Pump Pressure Sensor Circuit Low	4 ranked fixes
P24BB	EVAP System Leak Detection Pump Pressure Sensor Circuit High	4 ranked fixes
P24BC	EVAP System Leak Detection Pump Pressure Sensor Circuit Intermittent	4 ranked fixes
P24BD	EVAP System Leak Detection Pump Switching Valve Control Circuit/Open	4 ranked fixes
P24BE	EVAP System Leak Detection Pump Switching Valve Control Circuit Low	4 ranked fixes
P24BF	EVAP System Leak Detection Pump Switching Valve Control Circuit High	4 ranked fixes
P2DD9	EVAP System Leak Detection Pump Control Circuit Performance	4 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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