P2DD9EVAP System Leak Detection Pump Control Circuit Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2DD9 means the drive circuit of the evaporative leak detection pump is electrically intact, yet the pump does not react the way the command implies: the feedback the engine computer reads back, usually motor current or driver state, does not match the on or off request. Bosch-style DM-TL pumps on European cars are judged by their motor current, first while blowing through a 0.5 mm (0.020 in) reference orifice and then against the closed tank, so a sluggish motor or a resistive plug skews the entire leak test. CARB wants EVAP parts checked for proper functional response as well as for opens and shorts. GM's 2025 tables suspend their pump tests while a pump circuit fault is active. No maker documents P2DD9 publicly; plain circuit faults are P2400 to P2402. Driving is unaffected, only the leak check is lost.
- What you may notice
- Check engine light on
- EVAP readiness monitor stays incomplete
- No noticeable change in driving
- Likely causes
- LikelyPump motor worn or sluggish, current draw off target
- PossibleCorroded connector or chafed wire adding resistance in the pump feed
- PossibleWater or ice in the pump module (mounted near the wheel arch)
- RareFaulty output stage or current sensing in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.