3176C, 3406E and 3456 Industrial Engines Troubleshooting – Engine Overspeeds

Use this procedure in order to troubleshoot an engine overspeed or use this procedure if the following event code is active. Refer to Troubleshooting, “Event Codes” for information about event codes and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes.

Table 1
Event Code
Code and Description Conditions which Generate this Code System Response
E190(1) Engine Overspeed Warning The engine rpm has exceeded the trip point for engine overspeed for the delay time. The code is logged.
The warning will be displayed.
The warning will be cancelled when the engine speed drops to the reset value.

Probable Causes


  • Intake air is combustible. 
  • Sudden drop of load 

Recommended Actions

Intake Air is Combustible

Check for hydrocarbons in the surrounding atmosphere. Do not operate the engine in an environment with hydrocarbons in the surrounding atmosphere.

Sudden Drop of Load

Decrease the load on the engine gradually.

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