Code Definition

P0847 — Transmission Fluid Pressure Sensor/Switch B Circuit Low

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

About P0847

P0847 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 P0847 is stored, the module has detected a signal or supply voltage lower than the expected operating range; 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 P0847 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 P0847 fault code is activated when the control module detects a lower than expected voltage or signal in the Transmission Fluid Pressure Sensor/Switch 'B' circuit. This typically indicates an electrical issue such as a short to ground, reduced voltage supply, or problems within the sensor itself, leading to an inadequately low signal. Such a condition can affect the accurate monitoring of hydraulic pressure in the transmission, potentially impacting its performance.

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