Transmission Fluid Pressure Sensor/Switch D Circuit Low
What it means
P0877 means the transmission controller reads a low-voltage signal from fluid pressure sensor/switch "D", usually from a short-to-ground or open in the wiring. The engine starts and runs, but without an accurate pressure reading the transmission can shift late, slip, or drop into limp mode until the sensor circuit is repaired.
Can I keep driving? The engine runs, but shifts may be delayed, erratic, or slip, and the transmission may limp — have it looked at before long trips.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Delayed or erratic shifting
- Transmission slipping or harsh engagement
- Trouble engaging certain gears
Common causes
Most likely first
- Faulty transmission fluid pressure sensor/switch (D)Likely
- Short-to-ground or open in the sensor wiringCommon
- Loose or corroded connector in the circuitCommon
- Low or dirty transmission fluid affecting the readingLess often
How to diagnose & fix
Work through it in order
- Check fluid level and condition; correct if low or burnt.
- Read freeze-frame and inspect the pressure sensor connector and wiring for a short-to-ground or open.
- Compare the sensor's reported pressure with a scan tool to actual line pressure.
- Repair wiring/connector faults, then replace the pressure sensor/switch if it still reads low. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0877?+
Can I just clear P0877?+
Related codes
Read & clear P0877 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.