Powertrain, generic (extended)

P2407 EVAP System Leak Detection Pump Sense Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2407 reports a pump feedback that jumps around instead of staying steady. On current-measuring DMTL pumps VW's 2014 Golf and Touareg books define it precisely: the pump current fluctuates by more than 1 mA during the reference measurement, or it drops by more than 6 mA for at least 3 s while pumping, checked with the engine off and on. Audi's TSB 2071770 (Q5, Q5 e, Q3, Q7 and others, 2022-23) calls the diagnosis too sensitive and cures it with new ECM software, and VW's 01-23-03 does the same for the 2022 Atlas and Atlas Cross Sport 2.0T before any parts are replaced. Maserati and Jaguar list P2407 too. P2404 is the steady implausibility, P2403 a lost signal. The car runs normally; the warning light is the main effect.

Likely causes

Over-sensitive diagnostic calibration, fixed by ECM software update (Audi, VW 2022-23)
Loose contact or corrosion at the pump connector
Worn pump motor with unstable current draw

Symptoms

  • Check engine light, sometimes only after the car has been parked
  • Code returns irregularly after clearing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–500
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

P2404P2403P0442

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.