OBD-II Generic Error Code P0871: How to Fix It

Q: Can I drive with code P0871?

It is not recommended. Driving with a transmission pressure sensor issue can cause erratic shifting, slipping, or transmission damage. Have it diagnosed as soon as possible.

Q: How much does it cost to fix P0871?

The cost varies. DIY replacement of the pressure sensor (part $30-$100) and fluid change ($50-$100) can total under $200. A mechanic may charge $200-$400 for labor plus parts.

Q: What are common symptoms of P0871?

Symptoms include check engine light, harsh gear shifts, transmission slipping, delayed engagement, or limp mode (transmission stuck in one gear). Some vehicles may show no drivability issues.

Q: Can low transmission fluid cause P0871?

Yes. Low fluid can cause low hydraulic pressure, triggering the pressure sensor code. Always check fluid level and condition first.

Q: What does 'pressure sensor C circuit' mean?

It refers to the third pressure sensor (often on a multi-sensor transmission) that monitors internal line pressure. The 'circuit' includes the sensor, wiring, and the TCM.

Abstract

Error code P0871 indicates a problem with the transmission fluid pressure sensor 'C' circuit. This sensor monitors the hydraulic pressure inside your transmission to ensure proper shifting. When this code appears, the transmission control module (TCM) detects an abnormal voltage signal from the sensor, which can lead to harsh shifting, slipping, or limp mode.