C13, C15, and C18 Engines Troubleshooting – Indicator Lamp Problem

Probable Causes


  • Burned out bulb 
  • Problem with the lamp circuit 
  • A system on the power train data link 

Recommended Actions

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

Table 1
Troubleshooting Test Steps Values Results
1. Check the Circuit for the Lamp

A. Check the electrical circuit for the lamp.

B. Refer to Troubleshooting, “Indicator Lamp – Test”.

Lamp circuit Result: The electrical circuit is OK.

Proceed to Test Step 2.

Result: The electrical circuit is not OK.

Repair the circuit. Verify the repair.

2. Check the Systems on the Power Train Data Link

A. A system that is connected to the power train data link may be illuminating the lamp. Check the systems that are connected to the power train data link.

B. Obtain the necessary equipment, when possible. Monitor the appropriate parameters while the machine is experiencing problems. Determine if the condition is normal operation.

Power train data link Result: A system that is connected to the power train data link is illuminating the lamp.

Troubleshoot the system causing the illumination of the lamp.

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

If 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).

Posted in C18

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