B5.9G, B5.9LPG, B Gas Plus, B LPG Plus, and B Gas International Engines – Lubricating Oil Pressure Low

Electronic fault codes are active

For instructions on how to read active fault codes, refer to 101-007 (Electronic Controlled Fuel System) in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility.

Lubricating oil level is above or below specification

Check the oil level. Add or drain oil, if necessary. Refer to Procedure 007-043 (Lubricating Oil Level) in Section 3.

Lubricating oil is diluted with water

Check for a missing dipstick, rain caps, or oil fill caps. Change the oil. Refer to Procedure 007-002 (Lubricating Oil and Filters) in Section 4.

Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-002 (Lubricating Oil and Filters) in Section 4. Use the oil recommended in Section V.

Lubricating oil leak (external)

Inspect the engine for external oil leaks. Tighten the capscrews, pipe plugs, and fittings. Replace gaskets, if necessary. Refer to a Cummins Authorized Repair Facility if leaks are found.

Coolant temperature is above specification

Refer to the Coolant Temperature is Above Normal – Sudden Overheat or Coolant Temperature is Above Normal – Gradual Overheat symptom tree.

Lubricating oil pressure switch, gauge, or sensor is malfunctioning or is not in the correct location

Check the oil pressure switch, gauge, or sensor for correct operation and location. Refer to the OEM service manual .

Lubricating oil filter is plugged

Change the oil and filter. Refer to Section Procedure 007-002 (Lubricating Oil and Filters) in Section 4. Review the oil change interval. Refer to Section V.