P093D code meaning
Hydraulic Accumulator Solenoid Performance
Powertrain system Generic code P09xx codes Check engine light
What P093D means
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.
P093D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor2 to 10 hours
- Clears after repairAfter a drive cycle
Symptoms of P093D
- Engine stop-start disabled
- Lurch or bang when the engine restarts
- Firm shifts with adaptive learning frozen
Common causes of P093D
- Most likelyAccumulator solenoid stuck open (drains) or closed (no fill)
- PossibleAccumulator piston or bore leaking
- PossibleLeakage at clutch seals or a worn valve body
- Less likelyMissing or misplaced check ball after a rebuild
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hydraulic accumulator solenoidWiring harnessTCM
What each part of P093D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9 | Area: transmission. |
| 3D | The exact fault in that area. |
What to do next
- Note P093D 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 P093D
What does P093D mean?
P093D means "Hydraulic Accumulator Solenoid Performance". The accumulator solenoid circuit is electrically sound, but the accumulator system does not deliver the expected hydraulic result. It is a generic code, so it means the same on every make.
Is it safe to drive with P093D?
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 P093D fail an emissions test?
Yes, it can. P093D 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 P093D to fix?
Difficulty: workshop only. A typical repair takes 2 to 10 hours of work. This is a job for a workshop.
Will P093D 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.