Oil pressure low shut off engine light goes on and off

The oil pressure warning light is designed to illuminate any time the oil pressure is too low (below a pre-set engineering-specification). Low oil pressure can be caused by an oil level that is too low, a faulty oil pump or worn out engine bearings. The light could also potentially illuminate if the engine idle speed is excessively low (near stalling condition) due to the slow rate of pump rotation. There is also the possibility that a failure in the oil pressure warning circuit is causing the light to illuminate inappropriately; this could be the result of a failed oil pressure sensor or other wiring issue. Because the other symptom present is an engine stall (shuts off) condition, I'd recommend inspecting for a mechanical issue first. Ensure the oil level is correct, then attempt to turn the engine over by hand using a large ratchet on the center crankshaft pulley bolt; if the engine can be rotated it was not stalled out by a seized condition (which could be caused by a lack of oil pressure). If the engine runs but idles low, I'd suggest raising the RPM to see if the light goes away and prevents the stalling-out. If everything appears OK with a raised idle then the idle control system should be inspected. On the other hand if the light remains on, a mechanical oil pressure gauge should be installed to the oil pressure test port (near the oil filter) to confirm whether or not the oil pump is producing adequate oil pressure. You can read more here: https://www.yourmechanic.com/article/how-do-you-know-if-the-oil-pressure-gauge-is-bad

Normally, the oil light indicates low oil pressure, usually due to lowe oil level. That being said, is you have a constant oil light with the engine running and you are not getting clacking noises from the valves, you may have a defective oil sender. Regardless, it is not worth destroying the engine to find out. You should immediately shut the engine and check the oil level. If it is very low, add oil and retest. If the fault persists, attach a mechanical oil pressure gauge to the engine. If the pressure is normal (usually 30-45 psi), then change the oil pressure sensor. If the oil pressure is less that 20 psi, you should investigate the oil sump and pump for problems.

Your fuel pump power is controlled through the oil pressure switch, and if it is showing low pressure due to a leaking/defective oil pressure switch, it may shut off the fuel pump. Oil pressure switch failures are a common source for oil leaks. There could, and probably are, other issues going on. You never mentioned if the "check engine" light was on, and if it is, a scan would definitely be in order to determine the true cause of your problem
If it is not on, GM fuel pump failures are very common, as well as the vehicle security system my be having a programming issue. I would start by having the engine scanned (most Autozone locations do this for no charge) Good luck!

this means a mechanical gauge test is required to check actual pressure warm idling if low below 20 psi then the oil pressure pump relief is stuck open or engine bearing are worn

change the oil pressure sending unit on the eng. if this goes bad it sends the wrong voltage to the computer which will then detune the engine to reduce the chance of damage due to low oil pressure . Good Luck

oil light means loss of oil pressure.. not good ..check oil level fill to full if low..low oil pressure will cause fuel pump to be shut off..

If your Oil Pressure Sending Unit went bad, it will do this

If you have a Blockage in the Oil system, it can do it

If you are low on oil, it will do this

If you have done Damage to the Engine, it can do this

If you increase your oil to 20W-50 and the light goes off, you have a worn journal or Bearing Wear

With fuel injection if the pressure goes to low the fuel pump will stop and the lifters will get noisy.If you are seeing 10 lbs hot at idle I wouldn't worry to much.
If you have a high mileage vehicle and live in a warm climate,go for 20w50 oil at your next oil change,some use straight 40w oil to help oil pressure on worn engines.

Possible that the OIL filter is clogged and is reducing the pressure due to this when the engine is idling or in low RPM. So before you run the engine further and make it more damaging , it is worth to have the engine oil / oil filter changed. If there is still no result, check the oil pressure switch. If not the oil pump can be faulty. This needs a technical help and should be consulted.

when you press the brake pedal the brake master cylinder vacuum booster takes vacuum away from the engine and that slows the idle speed just enough to trigger the low pressure oil light. Pull the oil pressure sending unit out and hook up an oil pressure test gage, if the pressure is above 15 PSI hot engine idle in drive replace the oil pressure sending unit.