DEF Tank Temperature Is Low
Use this procedure to troubleshoot a low Diesel Exhaust Fluid (DEF) tank 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 |
|---|---|---|
| 4368-18
Aftertreatment #1 DEF Tank #2 Temperature : Low - moderate severity (2) |
E1399 (2)
Low Aftertreatment #1 DEF Tank #2 Temperature |
The DEF tank temperature is low. |
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| Associated Codes | ||
|---|---|---|
| J1939 Code | CDL Code | Troubleshooting Procedure |
| 4368-3 | 3135-3 | Troubleshooting, "DEF Tank Sensor - Test" |
| 4368-4 | 3135-4 | Troubleshooting, "DEF Tank Sensor - Test" |
- Codes
- Sensor
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Check for Codes A. Turn the breaker to the ON position. B. Connect Cat® Electronic Technician (ET) to the service tool connector. C. Look for active codes that are associated with the system for the event code. |
Codes |
Result: An associated code is active. Repair: Troubleshoot any associated codes before continuing with this test. Result: A code is active or logged. Proceed to Test Step 2. |
2. Check the DEF Tank #2 Temperature Sensor A. Turn the breaker to the ON position. B. Connect Cat ET. C. Use Cat ET to monitor the following temperature: - "Cabinet Temperature" - "DEF Tank #2 Temperature" |
Sensor |
Result: The "DEF Tank #2 Temperature" is within Repair:The DEF Tank temperature is too low. Contact your TC for assistance. Result: The "DEF Tank #2 Temperature" is not within Repair: A failed DEF tank temperature sensor has been detected. Replace the DEF header assembly. 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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