P0996
Transmission Fluid Pressure Sensor/Switch "F" Circuit Intermittent
- Severity
- High
- Driving
- Drive only to a garage
The signal from transmission fluid pressure sensor or switch "F" is dropping out intermittently. The transmission may drive normally for long periods and then shift badly or enter limp mode, recovering after a restart. Intermittent faults here are usually connections rather than the sensor.
Possible causes
- CommonLoose or corroded pin at the transmission case connector
- CommonFluid wicking into the connector
- CommonInternal transmission harness beginning to fail
- PossibleSensor dropping out when hot
- PossibleChafed wiring making intermittent contact
- PossibleGenuinely fluctuating pressure from a sticking valve
What you might notice
- Occasional limp mode clearing after a restart
- Shift quality varying between journeys
- Symptoms appearing only when hot
- Check engine light coming and going
What to check, in order
- Note whether it only happens hot, and record the freeze frame fluid temperature if the tool supports it.
- Pull the case connector and inspect for fluid and corrosion.
- Wiggle-test the external harness with the live data screen showing the pressure reading.
- Check the fluid level and condition.
- Do not commit to internal repairs until the external wiring and connector are cleared.
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