B5.9G, B5.9LPG, B Gas Plus, B LPG Plus – Lubricating Oil Pressure High

Symptom Tree  

Engine is cold

Allow the engine to warm to operating temperature. If the engine will not reach operating temperature, refer to the Coolant Temperature Below Normal Symptom tree.


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 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 .

Contact a Cummins Authorized Repair Facility

Last Modified:  28-Feb-2005