Cummins ISB4.5 CM2150 Fault Code: 471 PID: SPN: 98 FMI: 17 Engine Oil Level – Data Valid but Below Normal Operating Range – Least Severe Level.

Posted by PerDiezel Solutions on January 20, 2026

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
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

Possible Causes
-The engine was not filled to proper capacity during the most recent oil change
-External engine oil leaks
-Internal engine oil leaks (oil leaking into the fuel system or cooling system)
-High engine oil consumption/power cylinder malfunction (check for abnormally high blowby when the engine is loaded).

Cummins ISB4.5 CM2150 Fault Code: 466 PID: SID 32 SPN: 1188 FMI: 4 Turbocharger 1 Wastegate Control Circuit – Voltage Below Normal or Shorted to Low Source.

Cummins ISB4.5 CM2150 Fault Code: 465 PID: SID 32 SPN: 1188 FMI: 3 Turbocharger 1 Wastegate Control Circuit – Voltage Above Normal or Shorted to High Source.

Cummins ISB4.5 CM2150 Fault Code: 452 PID: SPN: 157 FMI: 4 Injector Metering Rail 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source.

Cummins ISB4.5 CM2150 Fault Code: 451 PID: SPN: 157 FMI: 3 Injector Metering Rail 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source.

Cummins ISB4.5 CM2150 Fault Code: 449 PID: SPN: 157 FMI: 0 Injector Metering Rail 1 Pressure – Data Valid but Above Normal Operating Range – Most Severe Level.

WARNING!