Code Definition

P0854 — Drive Switch Input Circuit Low

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

About P0854

P0854 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 P0854 is stored, the module has detected a signal or supply voltage lower 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 P0854 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 P0854 fault code is triggered when the vehicle's control module detects a low voltage condition in the Drive Switch Input circuit. This code indicates that the voltage signal from the Drive Switch, which informs the control module of the drive mode selection, is below the expected threshold. A low voltage signal in this circuit could be indicative of an electrical issue such as a short to ground. The Drive Switch is essential for the control module to accurately determine the vehicle's operational mode and to manage engine and transmission systems effectively.

Quick Facts