DEF Control Module Temperature Is High
Use this procedure to troubleshoot a high Diesel Exhaust Fluid Control Unit (DCU) temperature. Also, use this procedure if one of the following event codes is active or logged.
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| J1939 Code and Description | CDL Code and Description | Comments |
|---|---|---|
| 5480-16
Aftertreatment #1 DEF Controller Temperature : High - moderate severity (2) |
E1430 (2)
High Aftertreatment #1 DEF Controller #1 Temperature |
The temperature of the Aftertreatment #1 Diesel Exhaust Fluid Control Unit (DCU) #1 has exceeded the trip point of |
| 7528-16
Aftertreatment #1 DEF Controller #2 Temperature : High - moderate severity (2) |
E1656 (1)
High Aftertreatment #1 DEF Controller #2 Temperature |
The temperature of the Aftertreatment #1 DCU #2 has exceeded the trip point of |
| 7529-16
Aftertreatment #2 DEF Controller Temperature : High - moderate severity (2) |
E1657 (1)
High Aftertreatment #2 DEF Controller #1 Temperature (1) |
The temperature of the Aftertreatment #2 Diesel Exhaust Fluid Control Unit (DCU) #1 has exceeded the trip point of |
| 7535-16
Aftertreatment #2 DEF Controller #2 Temperature : High - moderate severity (2) |
E1658 (1)
High Aftertreatment #2 DEF Controller #2 Temperature (1) |
The temperature of the Aftertreatment #2 DCU #2 has exceeded the trip point of |
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| |
| Illustration 1 | g06084782 |
|
The DCUs are on the rear of the Pump Electronic Tank Unit (PETU). (1) Aftertreatment #1 DCU #1 (2) Aftertreatment #1 DCU #2 (3) Aftertreatment #2 DCU #1 (4) Aftertreatment #2 DCU #2 | |
- Heat Source
- DCU
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Determine the Source of the High Temperature A. Evaluate the installation location of the Diesel Exhaust Fluid Control Unit (DCU). B. Check for heat sources close to the DCU. |
Heat Source |
Result: The DCU is located close to a heat source. Repair: 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 |
DCU |
Result: The DCU was replaced. Verify that the repair eliminated the problem. |
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).
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