C13, C15, and C18 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. For information on the engine monitoring system, refer to Troubleshooting, “Engine Monitoring System”.

Note: Some of the following codes may not be applicable for certain applications.

Table 1
Diagnostic Trouble Codes
CDL Code J1939 Code Code Description
(code descriptions may vary)
E362 (1) 190-15 Engine Overspeed The code is logged.
E362 (3) 190-0 Engine Overspeed The code requires factory passwords to be cleared.

Probable Causes


  • Proceeding down steep grades (if applicable) 
  • Proper operation of the turbocharger 
  • Intake air 
  • Starting aids that are not operating properly 

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

Table 2
Troubleshooting Test Steps Values Results
1. Proceeding Down Steep Grades (If Applicable)

Engaging the engine brakes on a steep grade may be necessary.

A. The operator needs to understand the proper operation of the machine while using the engine brakes.

Not all applications have engine brakes.

Steep grades Result: Steep grades are the cause of the overspeed.

Control the engine speed during steep grades.

Result: Steep grades are not the cause of the overspeed.

Proceed to Test Step 2.

2. Proper Operation of the Turbocharger

A. Check for proper operation of the turbocharger.

B. Check for any oil that may be leaking into the air inlet.

Turbocharger Result: The turbocharger is leaking oil into the inlet.

Repair or replace the turbocharger.

Result: The turbocharger is not leaking oil into the inlet.

Proceed to Test Step 3.

3. Intake Air

A. Check for combustible gases in the surrounding atmosphere.

B. Check for proper operation of starting aids (if equipped).

Air quality Result: The atmosphere has combustible gases.

Do not operate the engine in an environment with combustible gases.

Complete the procedure in the order in which the steps are listed.

The procedure corrected the issue. Return the engine to service.

The procedure did not correct the issue.

Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

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