P0993
Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance
Transmission
Generic OBD-II
Medium
What it means
P0993 means the transmission fluid pressure sensor/switch F is reporting a pressure value that is implausible or out of its expected range. It can be caused by the sensor itself, low or dirty fluid, wiring faults, or a real hydraulic pressure problem, and it often shows up as harsh or erratic shifting rather than a total failure.
Medium
Can I keep driving? Usually driveable, but shift quality may suffer and the transmission may enter limp mode — check fluid and repair soon.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh or delayed shifts
- Erratic or abnormal shift behavior
- Reduced transmission performance
Common causes
Most likely first
- Faulty transmission fluid pressure sensor/switch FLikely
- Low or contaminated transmission fluidCommon
- Damaged wiring or an open/short in the sensor circuitCommon
- Corroded or loose connectorLess often
- Failing fluid pump or internal pressure problemLess often
- Faulty transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Check the transmission fluid level and condition first; correct or replace if low, burnt, or contaminated.
- Inspect the sensor wiring and connector for damage, corrosion, or a loose fit.
- Compare the sensor's live pressure reading to spec and replace sensor F if it reads out of range.
- If pressure is genuinely off, inspect the pump and internal hydraulics; have the TCM diagnosed last.
FAQ
Quick answers
Is it safe to drive with P0993?+
Short trips are usually fine, but abnormal or slipping shifts can wear the transmission. Check the fluid immediately and repair the cause before extended driving.
Can I just clear P0993?+
It will return unless the fluid problem, sensor, or wiring is corrected — this is a range/performance fault, not a random glitch.
Related codes
Often seen with P0993
Read & clear P0993 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX