P093DHydraulic Accumulator Solenoid 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
- The accumulator solenoid circuit is electrically sound, but the accumulator system does not deliver the expected hydraulic result. No manufacturer documents P093D publicly. GM's comparable P171D on the 9-speed transmission watches turbine speed during an engine auto-start: if it exceeds a predicted value because holding clutches slip from too little stored pressure, it counts a failure, enabled between 0 and 110 °C transmission fluid temperature, Type B. Gears Magazine names a solenoid stuck open or closed, a leaking accumulator piston, clutch or valve body leakage and misplaced check balls as causes. P093A to P093C are the electrical faults. Stop-start is disabled and the restart may feel like a bang.
- What you may notice
- Engine stop-start disabled
- Lurch or bang when the engine restarts
- Firm shifts with adaptive learning frozen
- Likely causes
- LikelyAccumulator solenoid stuck open (drains) or closed (no fill)
- PossibleAccumulator piston or bore leaking
- PossibleLeakage at clutch seals or a worn valve body
- RareMissing or misplaced check ball after a rebuild
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €250 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.