P2402 - Evaporative Emission System Leak Detection Pump Control Circuit High
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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 (EVAP) Leak Detection Pump Control Circuit/Open
Evaporative Emission System Leak Detection Pump Control Circuit Low
Evaporative Emission System Leak Detection Pump Sense Circuit Open
Evaporative Emission (EVAP) Leak Detection Pump Sense Circuit Range/Performance
Technical Description
The P2402 Diagnostic Trouble Code (DTC) indicates that the Engine Control Module (ECM) has detected a 'high' voltage condition in the Evaporative Emission (EVAP) Leak Detection Pump (LDP) control circuit. This signal is typically interpreted as a short to voltage. The LDP is used to pressurize or create a vacuum within the EVAP system to verify its integrity and detect leaks. When the ECM commands the pump OFF but still perceives a high voltage on the signal return line, or when the current draw exceeds OEM specifications, P2402 is stored. This affects the vehicle's ability to perform self-diagnostic EVAP leak tests.
Possible Causes
Short to voltage in the Leak Detection Pump wiring harness
Failed Leak Detection Pump (internal electrical short/low resistance)
Corrosion or short circuit in the electrical connector (moisture ingress)
Faulty Engine Control Module (ECM) internal driver circuit
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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