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Coolant Level – Data Valid But Below Normal Operational Range – Least Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2448 PID: SPN: 111 FMI: 1/17 LAMP: Maintenance SRT: |
Coolant Level – Data Valid But Below Normal Operational Range – Least Severe Level. Low engine coolant level detected. |
None on performance. |
 ISB, ISC, and ISL – Electronic Control Module
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Circuit Description
The coolant level sensor is a switch and is used to measure the level of the engine coolant in the radiator top tank. The coolant level sensor is immersed in the coolant and returns a different signal voltage when immersed in coolant versus being out of coolant. The electronic control module (ECM) monitors the change in the signal voltage to determine the level of the engine coolant.
Component Location
The engine coolant level sensor is typically located in the radiator top tank or surge tank. Refer to the OEM service manual for the location.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is operating.
Conditions for Setting the Fault Codes
The ECM detects that the coolant level is below the normal operating limits.
Action Taken When the Fault Code is Active
- The ECM flashes the amber CHECK ENGINE light at initial key-on for 30 seconds when low engine coolant level has been detected.
Conditions for Clearing the Fault Code
The ECM will stop flashing the amber CHECK ENGINE light at key-on when coolant has been added to the engine.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 in Section 19.
This fault code goes active when the coolant level inside the radiator top tank or surge tank drops below the sensor level. Fill the top tank with coolant.
Refer to Troubleshooting Fault Code t05-2448
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