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Engine Oil Level – Data Valid But Below Normal Operational Range – Most Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 253 PID: P98 SPN: 98 FMI: 1 LAMP: Red SRT: |
Engine Oil Level – Data Valid But Below Normal Operational Range – Most Severe Level. Very low oil level has been detected by the oil level sensor. |
The engine may derate. Possible low oil pressure, possible severe engine damage. |
 ISB, ISC and ISL with CM2150 – Engine Oil Level Sensor Circuit
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Circuit Description
An algorithm in the electronic control module (ECM) calibration monitors engine oil level while the ECM is keyed on and no engine speed is detected. If the engine oil level falls below a certain threshold, the ECM will activate Fault Code 253.
Component Location
The engine oil level sensor is located on the engine oil dipstick, on the air intake side of the engine. Refer to Procedure 100-002 (Engine Diagrams) in Section F for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is in the ON position and the engine speed is 0 rpm.
Conditions for Setting the Fault Codes
The engine oil level is detected to be very low at key-on.
Action Taken When the Fault Code is Active
- The ECM illuminates the red STOP ENGINE lamp immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
The ECM will turn off the red STOP ENGINE lamp and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleared using INSITE™ electronic service tool.
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 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
If inactive counts of Fault 253 are logged in the ECM, it could be possible that the engine was running or keyed on while tilted at an angle severe enough to cause this fault to be triggered.
Other causes of fault code 253 may include:
- The engine may not have been filled to proper capacity during the most recent oil change
- External engine oil leaks (oil leaking onto the ground)
- Internal engine oil leaks (oil leaking into the fuel system or cooling system)
- High engine oil consumption/power cylinder failure (check for abnormally high blowby when the engine is loaded).
Refer to Troubleshooting Fault Code t05-253
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