Powertrain, generic (extended)

P2405 EVAP System Leak Detection Pump Sense Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2405 is set when the feedback signal of the leak detection pump stays below its permitted window, typically from a short to ground on the sense line or a fault inside the pump. No public source states a voltage threshold for this code. It appears in Maserati's sheet MAS002203 (2020) for DMTL-equipped M156/M157/M161 petrol models from MY17, which notes that most DMTL checks run with the key off; Land Rover's SSM69118 and SSM71298 treat a confirmed P2405 as a defect within the DMTL pump, and the 2021 bulletin JLRTB02068NAS1 blames dirt entering through the pump's dust filter and replaces pump and filter cover. P2406 is the high-side counterpart, P2403 a missing signal. The car drives normally, but the EVAP test result is lost.

Likely causes

Internal DMTL pump fault, often after dirt ingress through the dust filter

Sense wire shorted to ground

Corroded connector at the pump mounted near the rear wheel arch

Symptoms

Check engine light, possibly set while the car is parked
No effect on drivability

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€100–600

Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

evap leak detection pumpevap pump wiring

Related codes

P2403 P2406 P2401

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.