P0993 code meaning
Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance
Powertrain system Generic code P09xx codes Check engine light
What P0993 means
Pressure sensor or switch F is electrically intact, but its reading does not match what the module expects from the commanded clutch state. No manufacturer documents this code publicly. The closest documented logic is GM's for switch E (TFP switch 5, 6T70/6T75): the module checks after each clutch release whether the switch returns to its exhausted state and counts failures, at 50 kPa or less commanded pressure for the low case. A sixth switch would be checked the same way, plausibility against commanded pressure and gear, which CARB requires for transmission inputs. Typical causes are sticking regulator valves, debris and worn switch films rather than wiring. P0992 is the plain circuit fault, P0994/P0995 are low and high.
P0993 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0993
- Harsh or flared shifts
- Shift adaptation frozen
- Warning light depending on calibration
Common causes of P0993
- Most likelySticking clutch regulator valve feeding the switch
- PossibleWorn or delaminated switch film, debris in the switch
- PossibleLow or contaminated transmission fluid
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Tfp sensor fWiring harnessTCM
What each part of P0993 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. |
| 93 | The exact fault in that area. |
What to do next
- Note P0993 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 P0993
What does P0993 mean?
P0993 means "Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance". Pressure sensor or switch F is electrically intact, but its reading does not match what the module expects from the commanded clutch state. It is a generic code, so it means the same on every make.
Is it safe to drive with P0993?
Drive gently and only to a workshop. With P0993 the car can go into limp mode (reduced power) to protect itself.
Will P0993 fail an emissions test?
Yes, it can. P0993 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 P0993 to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0993 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.