Low oil pressure indicator stays on

Diagnostic procedure 

• 1. Check the engine oil level .
• 2. Do the symptom troubleshooting for low oil pressure indicator stays on - Refer to: Engine Lubrication System Symptom Troubleshooting - Low oil pressure indicator stays on Engine Lubrication System Symptom Troubleshooting - Low oil pressure indicator does not come on with the vehicle in the ON mode  .

Also check for 

A wire shorted to ground between the PCM and the oil pressure switch