Error code

OBD2 P0871

OBD2P0871
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Fluid Pressure Sensor/Switch 'C' Circuit Range/Performance.

Severity

moderateThe vehicle can be driven but may experience harsh shifting and slippage. It is recommended to address the issue promptly.

Summary

Code P0871 indicates that the transmission fluid pressure sensor 'C' is not functioning correctly or has an issue with its circuit range/performance. This sensor is crucial for determining internal transmission pressure and affects shift quality.

Symptoms

  • Illuminated check engine light
  • Harsh shifting
  • Slippage
  • Vehicle stuck in limp mode

Common Causes

  • Failed transmission fluid pressure sensor
  • Faulty wiring or poor connection in the TFP circuit
  • PCM (Powertrain Control Module) faulty or requires reprogramming
  • Internal transmission problem

Diagnosis

  1. Check the transmission fluid level and condition.
  2. Inspect the TFP sensor and wiring for any faults or poor connections.
  3. Test the reference voltage and ground continuity of the circuit using a multimeter.
  4. Consult factory repair information for specific diagnostic procedures.

Fixes

  • Replace the faulty transmission fluid pressure sensor if it is determined to be at fault.

FAQ

What should I do if my vehicle enters limp mode due to P0871?

Addressing the underlying issue with the TFP sensor or circuit will likely resolve the limp mode. It's advisable to consult a professional mechanic for proper diagnosis and repair.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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