PAN 4256074 - Caterpillar

Probable Causes
This condition may be normal operation. One of the following features may be causing the elevated idle:
Low Battery Elevated Idle
Cold Mode Elevated Idle
PTO operation
Exhaust BrakeUse the Caterpillar Electronic Technician (ET) to verify that the engine is not in elevated idle. Elevated idle is indicated in the upper part of any status screen.Conditions
Low Battery Elevated Idle
The engine idle speed will be elevated to the value that is programmed into the "Battery Monitor Low Idle Engine Speed" parameter when all of the following conditions occur:
The vehicle is stopped.
The transmission is not in gear.
The brake pedal is not depressed.
The clutch pedal is not depressed.
System battery voltage is less than the value that is programmed into the "Battery Monitor & Engine Control Voltage" parameter for 30 seconds.Cold Mode Elevated Idle
The engine idle speed will be elevated to the value that is programmed into the "Warm Up Mode Idle Speed" parameter when all of the following conditions occur:
The transmission is not in gear.
The brake pedal is not depressed.
The clutch pedal is not depressed.
Cold mode is active.PTO Operation
The engine speed may be elevated during PTO operation. Check the value of the "PTO Engine RPM Set Speed" parameter.The Exhaust Brake Is Being Used as a Warm Up Device
Check the value of the "Exhaust Brake/Warm Up Enable" parameter. If the parameter is programmed to "Warm Up" or "Exhaust Brake and Warm Up", the engine idle speed may be elevated during idle.Refer to , "Exhaust Brake Circuit - Test" for additional information about this feature.