PINION-YM 2177705 - Caterpillar

Use this procedure if one of the following event codes are active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Diagnostic Trouble Codes
J1939 Code Code Description
(code descriptions may vary) Comments
5480-16 Aftertreatment #1 DEF Controller Temperature : High - moderate severity (2) The temperature of the Diesel Exhaust Fluid Control Unit (DCU) has exceeded the trip point of 116° C (240° F).
Illustration 1 g02931976
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Source of the High Temperature
A. Evaluate the installation location of the DCU.
B. Check for heat sources close to the DCU.
Heat source
Result: The DCU is located close to a heat source.
Eliminate the heat source by installing a heat shield or moving the component creating the heat.
Proceed to Test Step 2.
2. Replace the DCU
A. Replace the DCU.
DCU
Result: The DCU was replaced.
Verify that the problem is resolved.
Complete the procedure in the order in which the steps are listed.