what causes low oil pressure
Bad oil pump bypass valve, worn engine bearings, missing oil galley plugs. etc.
Defective oil pressure sender or gauge can indicate low pressure when the pressure is normal.
So verify by checking the oil pressure with a mechanical gauge.
Looking for a Used Sonoma in your area?
CarGurus has 538 nationwide Sonoma listings starting at $2,000.
Search GMC Sonoma Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Sonoma Experts