Transmission Fluid Pressure Sensor/Switch "D" Circuit
P0875 indicates a fault in the Transmission Fluid Pressure Sensor D circuit, which monitors transmission fluid pressure for shift control. This code sets when the PCM detects an open circuit, short to voltage, short to ground, or failed sensor in the TFPS D signal line.
What You Might Notice
- Transmission may shift erratically or harshly
- Check Engine Light illuminated
- Transmission may default to limp mode or safe shift pattern
- No immediately noticeable drivability issues if PCM compensates
- Possible transmission slipping or delayed shifts
Most Common Causes
- 1
Open Circuit in Signal Wiring
A break or disconnected wire in the TFPS D sensor circuit prevents signal transmission to the PCM. Check wiring harness for breaks, corrosion, or loose connectors.
- 2
Failed Transmission Fluid Pressure Sensor D
Internal mechanical or electrical failure within the TFPS D sensor itself causes incorrect or no signal output. The sensor may have failed internally or developed continuity issues.
- 3
Short to Voltage or Ground in Signal Circuit
Damaged wiring insulation causes the signal line to contact power or ground, creating an abnormal voltage state that the PCM recognizes as a fault.
- 4
Internal Transmission Mechanical Issue
Rarely, severe internal transmission damage or low fluid pressure conditions can trigger this code if the actual pressure readings are invalid regardless of sensor function.
How to Diagnose It
- 1
Check Open Circuit in Signal Wiring — A break or disconnected wire in the TFPS D sensor circuit prevents signal transmission to the PCM. Check wiring harness for breaks, corrosion, or loose connectors.
- 2
Check Failed Transmission Fluid Pressure Sensor D — Internal mechanical or electrical failure within the TFPS D sensor itself causes incorrect or no signal output. The sensor may have failed internally or developed continuity issues.
- 3
Check Short to Voltage or Ground in Signal Circuit — Damaged wiring insulation causes the signal line to contact power or ground, creating an abnormal voltage state that the PCM recognizes as a fault.
- 4
Check Internal Transmission Mechanical Issue — Rarely, severe internal transmission damage or low fluid pressure conditions can trigger this code if the actual pressure readings are invalid regardless of sensor function.
How to Fix It
- 1
Inspect and Repair Wiring Harness
Visually inspect the TFPS D sensor wiring harness for breaks, exposed wires, corrosion, and connector damage. Repair any damaged sections and ensure all connections are clean and tight.
- 2
Replace Transmission Fluid Pressure Sensor D
Remove the faulty TFPS D sensor from the transmission, drain fluid if necessary, install a new sensor, refill transmission fluid to proper level, and verify code clears.
- 3
Trace and Repair Signal Circuit Shorts
Use a multimeter to test for shorts to voltage or ground in the TFPS D signal line. Locate damaged insulation and repair or replace the affected wire section with proper automotive wiring.
- 4
Check Transmission Fluid Level and Condition
Verify transmission fluid level is at the correct mark and fluid is not burnt or contaminated. Low pressure or contaminated fluid can cause sensor faults; top up or perform fluid service as needed.
Need a deeper diagnosis?
Search for related repair guides or browse by system.