Code Definition

P1875 — Transmission Automatic Hall Effect Sensor Power Circuit Short To Battery / 4WD Low Switch Circuit Electrical

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Generic

About P1875

P1875 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1875 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; 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.

P1875 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC P1875 has two possible definitions depending on the manufacturer. In one it is a short to battery voltage in the hall effect sensor power supply circuit, where the sensor needs a regulated reference of about 5V and the module detects an overvoltage condition on that feed. In the other it is an electrical fault in the 4WD Low switch circuit, set when the switch input shows unexpected voltage or a loss of continuity. Confirm which definition applies to the vehicle from the service information first. Depending on the application, symptoms range from lost transmission speed or position data wi...

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