Oil Pressure problem

Have the oil pressure checked with a reliable gauge, if it is low the engine may be spent.

Yea, any real mechanic should be able to do a pressire check for you. Most likely culpret is a bad sending unit. But bad oil pump is also a good possability.

Change out the oil pressure sending unit.
When did it start coming on? After oil change? Wrong oil filter?

X2 and it might be a bad sensor either way get it checked NOW ,it could damage the engine in a heart beat.

We change the oil every 3,000 miles. The sending unit has also been changed. Our mechanic said it's not the oil pump because it is pumping oil. It's not doing it all the time, so it's confusing about when it does occur. The first time was 2 years ago, then last year later it did it again, and this year it's already done it 2 times. We change the oil as soon as it happens, but this last time was only after 1,000 miles.

Put a new filter on it.

Sorry didnt fully read your last post.


I hope your mechanic "knows its pumping" meaning he put a mechanical gauge on it.

It sounds to me a wiring issue. Not familiar is this application a switch or is it a pressure transducer. If its just a switch with say 5psig that faults and lights the dash it could be a wiring issue intermittently going to ground.

What brand and weight of oil? What brand oil filters do you use?

Verify oil pressure. If that gauge is seeing intermittent drops, you probably have debris plugging the pickup in the oil pan.

Not me personally,But a close friend has an 05 avalanche that was doing same thing.oil pressure gauge would drop to zero,warning light would come on and a check gauges warning would come on in the cluster display.

After much trial and error, his problem was in the instrument cluster itself.

STP, the racer's edge.
Seriously, low oil pressure with good oil pump sounds like main bearings, not good, if the pressure is really low.