Code Definition

P0852 — Park / Neutral Switch Input Circuit High

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

About P0852

P0852 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 P0852 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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 P0852 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 P0852 fault code is set when the vehicle's control module detects a high voltage condition in the Park/Neutral Position (PNP) switch input circuit. This situation arises when the voltage signal received from the PNP switch exceeds the normal operational range, which can indicate an electrical issue such as a short to power. The PNP switch is responsible for indicating to the control module whether the vehicle is in park or neutral, and a high voltage signal may lead to incorrect vehicle behaviour, especially in the control of engine and transmission systems.

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