CM850 Electronic Control System – FAULT CODE 471

Engine Oil Level — Data Valid But Below Normal Operational Range — Least Severe Level


Fault Code: 471
PID: P98
SPN: 98
FMI: 1/17
LAMP: Maintenance

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

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

Circuit: Engine Oil Level Sensor.

Circuit Description

An algorithm in the 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 471, as well as the maintenance lamp. The maintenance lamp will flash only during a keyon event.

Component Location

The engine oil level sensor is located on the engine oil dipstick, on the air intake side of the engine. 100-002 (Engine Diagrams) in section E for further details on dipstick location.

Shop Talk

If inactive counts of Fault 471 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 471 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).

On-Board Diagnostic (OBD) Information:

  • The ECM illuminates the appropriate amber or red fault lamp when the diagnostic runs and fails
  • The ECM turns off the appropriate fault lamp when the diagnostic runs and passes.

Refer to Troubleshooting Fault Code t05-471

Last Modified:  08-Jul-2010