P2DDA code meaning
EVAP System Leak Detection Pump Performance/Stuck Off
Powertrain system Generic code P2Dxx codes Check engine light
What P2DDA means
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.
P2DDA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2DDA
- Check engine light on
- Evaporative leak test never completes, readiness stays open
- Possible refuelling message or locked filler flap on some hybrids
Common causes of P2DDA
- Most likelyPump motor or vane inside the leak check module seized or worn out
- PossibleFresh-air filter or vent line of the module blocked by dirt or water
- PossibleSwitching valve in the module not moving, so the pump works against the wrong path
- Less likelyHose between module and canister split or off
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP leak detection pumpWiring harnessECM
What each part of P2DDA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| DA | The exact fault in that area. |
What to do next
- Note P2DDA and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2DDA
What does P2DDA mean?
P2DDA means "EVAP System Leak Detection Pump Performance/Stuck Off". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2DDA?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2DDA fail an emissions test?
Yes, it can. P2DDA is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2DDA to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2DDA clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.