An open circuit in the signal wire between sensor 'F' and the transmission control module; A short to voltage on the sensor signal circuit, often from chafed wiring near the transmission case; A failed transmission fluid pressure sensor or switch 'F' with an internal open or high-resistance fault; Corroded or loose pins in the sensor connector or the transmission control module connector; Low transmission fluid level or degraded fluid causing erratic pressure readings that trigger the high-voltage threshold; A faulty transmission control module, though this is the least common cause and should be ruled out last

DTC codes / P09xx · Transmission / P0995

P0995Transmission Fluid Pressure Sensor/Switch 'F' Circuit High

Q: What does code P0995 mean?

Transmission Fluid Pressure Sensor/Switch 'F' Circuit High. P0995 indicates that the transmission control module has detected an abnormally high voltage on the circuit for transmission fluid pressure sensor or switch 'F', which is one of several pressure monitoring points inside the transmission. The computer expects the signal voltage to stay within a calibrated range, and a high reading usually means the circuit is open, shorted to power, or the sensor's internal resistance has shifted.

P0995 indicates that the transmission control module has detected an abnormally high voltage on the circuit for transmission fluid pressure sensor or switch 'F', which is one of several pressure monitoring points inside the transmission. The computer expects the signal voltage to stay within a calibrated range, and a high reading usually means the circuit is open, shorted to power, or the sensor's internal resistance has shifted.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

Illumination of the check engine light or transmission warning light, often with no other noticeable symptoms
Harsh or delayed gear shifts as the transmission defaults to a fail-safe pressure strategy
The transmission may stick in a single gear or refuse to downshift during acceleration
A noticeable flare or slip when shifting between gears under load
Reduced fuel economy or altered shift feel that the driver perceives as unusual

Common causes, most likely first

An open circuit in the signal wire between sensor 'F' and the transmission control module
A short to voltage on the sensor signal circuit, often from chafed wiring near the transmission case
A failed transmission fluid pressure sensor or switch 'F' with an internal open or high-resistance fault
Corroded or loose pins in the sensor connector or the transmission control module connector
Low transmission fluid level or degraded fluid causing erratic pressure readings that trigger the high-voltage threshold
A faulty transmission control module, though this is the least common cause and should be ruled out last

How to diagnose and fix it

Verify the transmission fluid level and condition, then top off or service the fluid if it is low or contaminated
Inspect the sensor 'F' connector and the transmission control module connector for corrosion, loose pins, or pushed-back terminals
Perform a voltage drop test on the sensor signal circuit while wiggling the harness to expose intermittent opens
Check the sensor's reference voltage and ground circuits with a multimeter to confirm the module is supplying the correct values
Replace the transmission fluid pressure sensor or switch 'F' if circuit tests confirm the sensor is not responding correctly
Clear the code and perform a relearn or adaptation drive cycle so the transmission control module can recalibrate shift pressures
If the code returns after sensor replacement and circuit repair, test the transmission control module for internal faults before replacement

What a high pressure sensor reading really means

A high voltage on a pressure sensor circuit usually indicates an open circuit or a short to power, not necessarily a failed sensor, so circuit testing must come before parts replacement.
Many transmissions use multiple pressure switches, and a code for switch 'F' does not mean the entire transmission is failing; it points to one specific monitoring point.
Low or aerated transmission fluid can cause pressure readings to spike intermittently, setting P0995 even when the sensor and wiring are healthy.
Chafed wiring near hot exhaust components or sharp transmission case edges is a common hidden cause that a visual inspection alone may miss.
Replacing the sensor without clearing transmission adaptations can leave the module operating on old pressure learning values, causing the code to reappear immediately.

Can I keep driving with P0995?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration or towing because the transmission may be operating on reduced pressure and could shift harshly or slip. If the transmission enters limp mode or refuses to shift, stop driving and arrange a tow to prevent internal damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.