P2400 - Evaporative Emission (EVAP) Leak Detection Pump Control Circuit/Open
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System
Powertrain (Engine & Gearbox)
OBS!This code is in a manufacturer-specific range. The description may vary depending on the vehicle manufacturer.
Related Fault Codes
Evaporative Emission System Leak Detection Pump Control Circuit Low
Evaporative Emission System Leak Detection Pump Control Circuit High
Evaporative Emission System Leak Detection Pump Sense Circuit Open
Evaporative Emission (EVAP) Leak Detection Pump Sense Circuit Range/Performance
Technical Description
P2400 is a generic diagnostic trouble code (DTC) that indicates an 'open circuit' condition in the control circuit of the Evaporative Emission (EVAP) Leak Detection Pump (LDP). The LDP is used by the Engine Control Module (ECM) to pressurize or apply vacuum to the fuel system to detect vapor leaks. When the ECM commands the pump 'ON' but detects no continuity or current flow through the circuit, P2400 is set. This monitor typically runs during a cold start or when the vehicle is stationary under specific atmospheric conditions.
Possible Causes
Corrosion or loose connection at the LDP connector
Failing Leak Detection Pump (internal motor open circuit)
Wiring harness break or open circuit in the signal/ground wire
Blown fuse supplying the EVAP pump assembly
Internal ECM failure
Symptoms
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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