what causes low oil pressure

Asked by May 06, 2016 at 06:00 PM about the 2003 GMC Sonoma

Question type: Maintenance & Repair

low oil pressure when idling

5 Answers

115,805

Bad oil pump bypass valve, worn engine bearings, missing oil galley plugs. etc.

1 people found this helpful.
65,265

Defective oil pressure sender or gauge can indicate low pressure when the pressure is normal.

2 people found this helpful.
83,495

So verify by checking the oil pressure with a mechanical gauge.

1 people found this helpful.

Ok Oil pressure is about 25 to 30 give gas over 40 steady 25 r up just bought it 95000

83,495

That sounds ok, try replacing the oil pressure sending unit, and give it an oil & filter change if it is close to being due.

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