Code Definition

P0855 — Drive Switch Input Circuit High

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

About P0855

P0855 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 P0855 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 P0855 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 P0855 fault code is set when the vehicle's control module detects a high voltage condition in the Drive Switch Input circuit. This indicates that the voltage signal from the Drive Switch, which is responsible for informing the control module about the selected drive mode, exceeds the normal operational range. A high voltage condition in this circuit might be due to an electrical issue such as a short to power. The correct functioning of the Drive Switch is crucial for the control module to accurately determine the vehicle's drive mode and to control engine and transmission functions approp...

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