Faulty transmission fluid pressure sensor or switch 'D' itself; Damaged, chafed, or corroded wiring in the sensor circuit; Loose or contaminated electrical connector at the sensor or TCM; Low transmission fluid level or degraded fluid causing incorrect pressure readings; Internal transmission mechanical issues, such as a stuck valve or worn pump, affecting pressure; A malfunctioning transmission control module (TCM) or a software glitch; Poor ground connection for the sensor or TCM

DTC codes / P08xx · Transmission / P0875

P0875Transmission Fluid Pressure Sensor/Switch 'D' Circuit

Q: What does code P0875 mean?

Transmission Fluid Pressure Sensor/Switch 'D' Circuit. P0875 indicates that the transmission control module (TCM) has detected an electrical fault in the circuit for transmission fluid pressure sensor or switch 'D', which is typically used to monitor a specific hydraulic circuit inside the automatic transmission. The computer compares the sensor's signal to expected values and sets this code when the voltage or resistance falls outside the normal range for a set period.

P0875 indicates that the transmission control module (TCM) has detected an electrical fault in the circuit for transmission fluid pressure sensor or switch 'D', which is typically used to monitor a specific hydraulic circuit inside the automatic transmission. The computer compares the sensor's signal to expected values and sets this code when the voltage or resistance falls outside the normal range for a set period.

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, especially when the transmission is cold
The transmission may enter limp mode, limiting vehicle speed and gear selection
Slipping or flaring during acceleration as the transmission struggles to maintain pressure
Erratic shift patterns or failure to downshift when passing
In some cases, the vehicle may refuse to shift out of a particular gear

Common causes, most likely first

Faulty transmission fluid pressure sensor or switch 'D' itself
Damaged, chafed, or corroded wiring in the sensor circuit
Loose or contaminated electrical connector at the sensor or TCM
Low transmission fluid level or degraded fluid causing incorrect pressure readings
Internal transmission mechanical issues, such as a stuck valve or worn pump, affecting pressure
A malfunctioning transmission control module (TCM) or a software glitch
Poor ground connection for the sensor or TCM

How to diagnose and fix it

Check transmission fluid level and condition; top off or replace fluid if necessary
Inspect the sensor 'D' connector and wiring for damage, corrosion, or looseness; clean and secure as needed
Test the sensor 'D' with a multimeter for resistance and voltage according to the manufacturer's specifications
Check the circuit continuity from the sensor to the TCM, looking for opens or shorts
If the sensor is faulty, replace it and clear the code
Inspect the TCM connectors and grounds for integrity; repair any issues
If all electrical checks pass, perform a transmission pressure test and inspect internal components for mechanical faults

Don't overlook the wiring harness

A common oversight is replacing the pressure sensor without checking the wiring harness, which often rubs against sharp metal edges or gets contaminated by fluid leaks, causing intermittent shorts.
P0875 can be set by low transmission fluid level or old fluid that has lost its friction properties, so always verify fluid condition before condemning electrical parts.
Some vehicles use a single pressure sensor for multiple circuits, and a fault in one circuit can trigger codes for others; always check for related codes to avoid misdiagnosis.
The TCM may set P0875 as a result of a software issue, and a reflash or update might be required after repairs.
A faulty ground connection for the transmission or TCM can cause voltage irregularities that mimic a bad sensor, so don't skip ground inspections.

Can I keep driving with P0875?

You can drive with P0875, but the transmission may enter limp mode or shift harshly, which can be unsafe in traffic. Avoid towing or heavy loads and have the fault diagnosed promptly to prevent further transmission damage.

Tools that help

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