Powertrain, generic (extended)

P2DDA EVAP System Leak Detection Pump Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2DDA is stored when the leak detection pump fails to create the pressure change the leak test expects, as if it never started or moves too little air. GM performs this check on its electric leak check pumps (ELCP) under its own code P145C: at engine-off wake-ups between roughly 4.3 and 11 hours after shutdown the pump runs against a 0.020 in reference orifice, and if vacuum stays under 100 Pa after 60 s on the first measurement or 30 s on the second, the pump is judged stuck off; Type B, two trips. Mitsubishi's 2023 Outlander PHEV reports a pump stuck on or off under P24C0, after canister pressure falls too slowly. No manufacturer documents P2DDA publicly. The leak test cannot finish; the car drives normally. A pump running when told to stop is P2DDB.

Likely causes

Pump motor or vane inside the leak check module seized or worn out
Fresh-air filter or vent line of the module blocked by dirt or water
Switching valve in the module not moving, so the pump works against the wrong path
Hose between module and canister split or off

Symptoms

  • Check engine light on
  • Evaporative leak test never completes, readiness stays open
  • Possible refuelling message or locked filler flap on some hybrids

Repair estimate

DifficultyMediumDIY possible
Parts and labour€120–600
Time0.5–2.5 h

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

Parts involved

evap leak detection pumpwiring harnessecm

Related codes

P2DDBP2DD9P24C0P24C1P0455P0456

References: gsi.ext.gm.com, mitsubishitechinfo.com, law.cornell.edu.