P0192 - Fuel Rail Pressure Sensor Circuit Low Input

P0192 is stored when the ECM/PCM detects that the Fuel Rail Pressure (FRP) sensor signal voltage remains below the calibrated limit (typically <0.2V to 0.5V) for a specific duration. The sensor uses a 5V reference wire, a ground wire, and a signal wire. A 'Low' input code usually indicates a short to ground on the signal wire, a loss of the 5V reference, or an internal sensor failure. Since the ECM relies on this data for closed-loop fuel pressure control, it will often default to a safe-mode strategy, limiting engine RPM and power to prevent mechanical damage to the common rail system.