99 GMC Sierra Fluid Leak Immediately after Getting Oil Change

Sometimes heat and vibration can cause filters to loosen enough to leak if not tightened enough when initially installed .

My engine light in my 2002 GMC Sonoma has been on for the past four weeks. Yesterday I had an oil change done on my truck with a local mechanic. He turned the engine light off, but it came on soon after leaving his shop.
This morning I went to start my truck and there was NO power whatsoever. After repeatedly turning the key, I soon saw a slight movement on the battery display, but no lights would come on. It just seemed like it wasn't getting any power. I changed the battery two years ago, so it should be fine.
Eventually, the truck received full power and started, more less out of no where. It wouldn't hold an idle and would just die if i took my foot off the gas.
Hopefully someone has a solution for me.
Thanks.

I'm assuming that this reading is at idle? The range for oil pressure is more like 30-40PSI at idle and 10-20 more at speed. The reasons your pressure is reading too high could be:

--The gauge or the sensor itself is bad (not uncommon)
--The mechanic used the wrong oil viscosity when changing your oil, and the thicker oil than specifications call for is causing higher pressures.
--The mechanic accidentally knocked off the wire to the oil sensor when changing the oil
--A bypass valve in the pump or filter is clogged and causing the high pressure.

This is a relatively new car and if this problem developed immediately after the oil change I'd suspect the wrong oil was used or the wire to the sensor was knocked off. If the problem developed near the oil change, but not right after, I'd suspect it was coincidence and that there is a problem with the gauge. Go back to your mechanic.

because your oil pressure rises to around 40psi when running and will leak at the weakest place,check your oil sending unit first and seals.






Tim

If its spinning than the nut inside the pad has broken its welds to the pan. Replacing the pan is the fix.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

hi Bottomline 19.
all i can find out is,it might be the oil pan gasket needs to be replaced.
check this link out,its on youtube showing what the problem might be.
2001 GMC Sierra Changing the oil pan gasket
and there is more at this link.
2001 GMC Sierra 1500 HD oil residue on the oil pan and filter Google Search

You have to drop the transmission oil pan to change the oil, while you are changing the oil the filter is also replaced too.

as soon as you turn key on hit the gas pedal 3 times really fast you may need to do this a couple of times

You are correct, it's not brake fluid. Check the level in your rear axle, it sounds like you have bad seals in the axles allowing the rear differential gear oil to leak inside the brake drums.
This is a heavy weight oil, 80 or 90 weight. This leakage will ruin your brake pads, and if enough leaks out, your rear differential will blow. The seals aren't expensive, but it's a lot of labor to pull everything apart to get at the seals, plus new rear brakes. My Ford ( and I'm sure your GMC) require removal of the rear axles to change the seals. Good Luck! countrycurt0