The pump is commanded on but does not deliver: it does not turn, turns too slowly or produces too little pressure. The module judges this from pressure or speed feedback. No manufacturer documents this exact code publicly. Mercedes reports a comparable condition of the electric auxiliary oil pump on the 722.9 automatic under P0944; its test plan checks connector and fuse, supply voltage, CAN lines and software, then a check valve in the converter housing, before the pump is replaced. Hyundai lists a stuck high-flow pump on its 8-speed DCT as P193E71. CARB requires functional checks on outputs. P094B is the opposite fault, P094A the driver, P0944 the pressure loss of the whole unit.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- Warning light on
- Engine restarts at once or stop-start not available
- Delayed engagement or lost drive
Most likely causes
- Air in the pump after service or a suction leak
- Seized or failed pump motor
- Blocked strainer or leaking check valve
- Supply or relay fault stopping the pump
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P094C means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 9: Transmission
- 4C: Specific fault in that system
Frequently asked questions
Can I keep driving with code P094C?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P094C?
The most common causes are: air in the pump after service or a suction leak; seized or failed pump motor; blocked strainer or leaking check valve.
Related codes
- P094BHydraulic Pump Stuck On
- P094AHydraulic Pump Driver Performance
- P0944Hydraulic Pressure Unit Loss of Pressure
- P0C2AElectric/Auxiliary Transmission Fluid Pump A Motor Stalled
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.