Oil Pressure Low, Stop Engine warning on DIC. - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

turbonegro89 · #1 10-15-2011, 08:21 PM

Came to a light today and the RPMs dropped and I got a message saying Oil Pressure low, followed by Shut off engine. I changed my battery earlier this week and this happened. The oil level is good and I just cleaned the throttle body two days ago and this started today, was wondering if anyone had any ideas, thanks.

Sidenote, just under 150,000 miles

gregoryd12 · #2 10-15-2011, 08:35 PM

Did the oil pressure gage drop, also? They are controlled by same oil pressure switch.
How low did the RPM go?If you didn't do a thorough enough cleaning of the the throttle body and plate, front and back, it could have stuck and cause the engine to almost quit, and show low oil pressure, maybe.

turbonegro89 · #3 10-15-2011, 08:51 PM

Quote:

Originally Posted by gregoryd12

Did the oil pressure gage drop, also? They are controlled by same oil pressure switch.
How low did the RPM go?If you didn't do a thorough enough cleaning of the the throttle body and plate, front and back, it could have stuck and cause the engine to almost quit, and show low oil pressure, maybe.

I don't actually remember, I just remember the RPMs dropping, when I looked over at the oil gage, it was normal. Not to be a smartass, but it was looking pretty good, I felt like it was cleaned pretty thoroughly.

Ralph_T · #4 10-15-2011, 09:14 PM

Quote:

Originally Posted by turbonegro89

Came to a light today and the RPMs dropped and I got a message saying Oil Pressure low, followed by Shut off engine. I changed my battery earlier this week and this happened. The oil level is good and I just cleaned the throttle body two days ago and this started today, was wondering if anyone had any ideas, thanks.

Sidenote, just under 150,000 miles

Did you disconnect the battery after cleaning the throttle body? Leave it disconnected for 30 minutes.

turbonegro89 · #5 10-16-2011, 12:20 AM

I had it disconnected for probably 15-20 minutes afterwards, I figured that would have worked.

Ralph_T · #6 10-16-2011, 12:27 AM

Quote:

Originally Posted by turbonegro89

I had it disconnected for probably 15-20 minutes afterwards, I figured that would have worked.

Some of the members have noted that there is a difference in the way some of the parameters clear from the ECM if the battery is disconnected longer. I disconnected my battery a few times for 15 minutes and then three or four times for over 1 hour. The times I disconnected the battery for over an hour the throttle body learned parameters were obviously erased because the idle was higher when I started it back up. You might want to let it sit a bit longer.

turbonegro89 · #7 10-16-2011, 12:48 AM

Okay, gnarly, I'll try disconnecting it for longer tomorrow, thanks. I also didn't know if this could be an oil pressure sensor or I think I read something about an oil pressure sender I believe.

Ralph_T · #8 10-16-2011, 01:36 AM

Quote:

Originally Posted by turbonegro89

Okay, gnarly, I'll try disconnecting it for longer tomorrow, thanks. I also didn't know if this could be an oil pressure sensor or I think I read something about an oil pressure sender I believe.

Not sure I am following you. You said the engine rpm's went down and then the oil pressure light came on. That would be consistent with low rpm's. I think your trying to jump to the conclusion that the oil pressure sender is bad. I wouldn't make that assumption unless the light comes on while driving and idling correctly. Right now were are trying to get your truck to idle correctly. You could also check the plug for the oil pressure sender. It sits directly below the power steering pump attached to the block. The plug could be contaminated with dripping power steering fluid. Nothing a little electrical contact cleaner couldn't solve.

turbonegro89 · #9 10-16-2011, 11:30 PM

Quote:

Originally Posted by Ralph_T

Not sure I am following you. You said the engine rpm's went down and then the oil pressure light came on. That would be consistent with low rpm's. I think your trying to jump to the conclusion that the oil pressure sender is bad. I wouldn't make that assumption unless the light comes on while driving and idling correctly. Right now were are trying to get your truck to idle correctly. You could also check the plug for the oil pressure sender. It sits directly below the power steering pump attached to the block. The plug could be contaminated with dripping power steering fluid. Nothing a little electrical contact cleaner couldn't solve.

I had only jumped to that conclusion because when I was browsing and saw some of the same things happening to people and that was a consensus that a few people had came too. Regardings the RPM issue, it would fall from normal idle to just over 0 and then come back up again, only once it stalled but on my way home it would fall and come back up at nearly every stop light.

Tatonka · #10 10-17-2011, 12:47 PM

I had the exact warning light come on in my truck a few months back. I turned it off and few minutes later started it again and didn't have any problems. My wife got the message again just two weeks ago but it too went away. Oil level is fine, no leaks. I too am leaning towards the oil pressure switch/sensor and plan to swap it out at my next oil change. If you discover that something else is causing this warning light please post your findings.