What it means
Electrical fault on the transmission fluid pressure sensor D circuit. Sensor D monitors an additional hydraulic line on multi-clutch transmissions.
At a glance
- Usually lights the check-engine light
How it works
Transmission pressure sensor/switch D monitors hydraulic pressure at a D channel used by the transmission control system, where fitted. P0875 indicates an electrical fault in the D sensor circuit, so the control module cannot rely on that channel's signal for shift control.
Common causes
Most likely first.
- Sensor failed
- Wiring fault
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame data and check whether the code is current, then review available live sensor D data for an absent or implausible signal.
- Locate sensor D using vehicle-specific service information and inspect its connector and harness for damage, looseness, corrosion, or contamination.
- Check that the D sensor connector is fully seated and its terminals have no visible damage or poor contact.
- Use the wiring diagram to test the D circuit's power or reference, ground, signal, and continuity against the manufacturer's specification.
- If the circuit tests correctly, test pressure sensor/switch D and replace it only if its output fails the specified checks.
Common fixes
- Secure the sensor D connector and clean or repair poor terminal contact.
- Repair damaged wiring or a failed connection in the D circuit.
- Replace pressure sensor/switch D if it fails testing with a sound circuit.
- Clear the code and confirm D-channel data is present and stable after the repair.
Can I keep driving?
If the transmission shifts normally, drive gently only as needed to reach a place where it can be checked; avoid towing and hard acceleration. If shifting becomes harsh, delayed, or slipping, stop driving because the D-channel fault may impair shift control and continued slipping can cause damage.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.