P0933
Hydraulic Pressure Sensor Range/Performance
- Severity
- High
- Driving
- Drive only to a garage
The hydraulic pressure sensor is answering, but the pressure it reports is not plausible - it does not rise when the pump runs, does not fall as the actuators use it, or sits at an unlikely value. Either the sensor is wrong, or the pressure genuinely is, and the second is the more likely and more serious.
Possible causes
- CommonGenuine loss of pressure - a leak in the hydraulic circuit
- CommonFailed accumulator no longer holding pressure
- CommonWorn or failing hydraulic pump
- CommonLow hydraulic fluid level
- PossibleFailing or drifting pressure sensor
- PossibleBlocked filter in the hydraulic circuit
What you might notice
- Slow or failed gear changes
- Hydraulic pump running far more often than normal
- Car stuck in neutral
- Transmission warning message
- Fluid leak visible near the transmission
What to check, in order
- Check the hydraulic fluid level and look for leaks. A leak is the most common cause and it is visible from underneath.
- Listen to how often the pump runs. Frequent cycling with the car standing still means pressure is escaping somewhere.
- Watch the pressure reading on the live data screen through a pump cycle - it should rise steadily and then hold.
- Suspect the accumulator if pressure rises normally but falls away quickly once the pump stops.
- Read all codes - a pressure unit or pump relay code alongside this one names the component.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission and control modules
P0900P0901P0902P0903P0904P0905P0906P0907P0908P0909P0910P0911P0912P0913P0914P0915P0916P0917P0918P0919P0920P0921P0922P0923P0924P0925P0926P0927P0928P0929P0930P0931P0932P0933P0934P0935P0936P0937P0938P0939P0940P0941P0942P0943P0944P0945P0946P0947P0948P0949P0950P0951P0952P0953P0954P0955P0956P0957P0958P0959P0960P0961P0962P0963P0964P0965P0966P0967P0968P0969P0970P0971P0972P0973P0974P0975P0976P0977P0978P0979P0980P0981P0982P0983P0984P0985P0986P0987P0988P0989P0990P0991P0992P0993P0994P0995P0996P0997P0998P0999