ISC RPM out of range

"ISC RPM out of range" typically refers to an issue with the Idle Speed Control (ISC) system in a vehicle, indicating that the engine's idle speed is not within the expected parameters. This can be caused by various factors, including a malfunctioning ISC valve, vacuum leaks, or issues with the engine management system. It may result in rough idling, stalling, or poor engine performance. Diagnosing the specific cause often requires checking for error codes and inspecting the ISC components.