SPN 98 - FMI 17 (Fault Code 471)

SPN 98 - FMI 17 (Fault Code: 471)
ISB, ISC, and ISL with CM2150 - Engine Oil Level Sensor.

Fault Code: 471
PID(P), SID(S): P98
SPN: 98
FMI: 1/17

REASON: Engine Oil Level - Data Valid But Below Normal Operational Range - Least Severe Level. Low oil level has been detected by the oil level sensor.

EFFECT: The engine may derate. Possible low oil pressure, possible severe engine damage.

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 471, as well as the maintenance lamp. The maintenance lamp will flash only during a key-on event.

Component Location:
The engine oil level sensor is located on the engine oil dipstick, on the left side of the engine.

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 low at key-on.

Action Taken When the Fault Code is Active:
• The amber CHECK ENGINE light will flash for 30 seconds when the keyswitch is turned on.

Conditions for Clearing the Fault Code: The amber CHECK ENGINE light will stop flashing at key-on and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleared with 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.

If inactive counts of Fault Code 471 are logged in the ECM, it can 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 471 can include:
• The engine was not 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).

Read More:
SPN 98 - FMI 4 (Fault Code 499)
SPN 157 - FMI 4 (Fault Code 452)


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