Code Definition

P0846 — Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance

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

About P0846

P0846 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 P0846 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 P0846 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 P0846 fault code is set when the control module detects a range or performance issue with the Transmission Fluid Pressure Sensor/Switch in Circuit 'B.' This condition implies that the sensor's output signal is outside of the expected range or not performing as anticipated. Such discrepancies can be due to sensor malfunction, issues in the hydraulic system affecting pressure readings, or problems within the sensor's electrical circuit, including wiring and connectors.

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