Powertrain, generic (extended)

P2406 EVAP System Leak Detection Pump Sense Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2406 is the mirror image of P2405: the pump feedback reads above its allowed range, as with a short to a voltage source or a sense line that floats high. Thresholds are not published. Jaguar's JTB00436 for the XJ (X351) includes P2406 among DMTL faults caused by water or ice from tyre spray caught in the pump filter and has the canister and filler pipe renewed. Maserati's DMTL sheet MAS002203 and Land Rover's SSM69118/SSM71298 list it as well, and JLR's 2021 bulletin JLRTB02068NAS1 (Range Rover, Discovery, Range Rover Sport) replaces the pump with a new dust filter cover after contamination. It differs from P2404 in that the signal leaves its electrical range instead of merely being implausible. Driving is unaffected.

Likely causes

Water or ice from road spray in the pump filter (Jaguar XJ)
Sense wire shorted to a voltage feed or open ground at the pump
Pump damaged by contamination entering through the dust filter

Symptoms

  • Check engine light
  • Fault often appears after wet or freezing weather

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–700
Time0.5–2.5 h

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

Parts involved

evap leak detection pumpevap pump wiring

Related codes

P2403P2405P2402

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