Code Definition

P0871 — Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0871

P0871 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0871 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0871 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0871 is set when the control module detects an operational range or performance issue with the Transmission Fluid Pressure Sensor/Switch 'C'. This code indicates that the sensor's signal or the performance of the switch falls outside of the expected range or does not align with the preset parameters. This could affect the accurate monitoring and regulation of the transmission fluid pressure, leading to potential issues with transmission operation.

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