Vehicle in limp mode shows no oil pressure that runs fine

Asked by Nov 22, 2016 at 08:49 AM about the 2007 Chevrolet Tahoe LS 4WD

Question type: General

2007 Tahoe 5.3 with about 240,000 miles
on it driving down the road vehicle
automatically went into her instantly went
into limp mode shut it off we started it
showed no oil pressure I'll chime in light
came on now have put a new oil pressure
sensor into it and it shows still no oil
pressure still in limp mode but runs
beautiful as far as sitting there and I don't
like any thoughts I've also put a new
Excelerator pedal positioning sensor in

9 Answers

140

If its showing no pressure you need to check the oil. If the oil is okay, remove the pan and check the oil pump. The same thing happened to me and my oil pump had fallen off

7,175

Check oil pressure with manual gauge, check when cold and see if pressure drops as it heats up to normal operating temperature, you may be due for a new engine at 240k miles

805

Oil sending light

30

My gauge is pegged at 80psi, sometimes when I hit a bump it'll drop to 0psi and my dash will chime low oil pressure then it'll go back to being pegged at 80. When the ignition is off its at 0 start it immediately go to 80.. ??????

74,565

These oil pressure issues with Chevy engines come up just about everyday on Car Gurus. I would install an aftermarket mechanical oil pressure gauge so I knew what the oil pressure really is.

30

Thanks F.O.R. I'm a newbie on this site so I didn't know this was an everyday question lol. Where is the oil sending unit?

7,175

Just replace oil sending unit. It's located on top of the engine block between intake manifold and firewall on driver's side. U'll need an 1 1/16" socket to remove it

30

Ok

70

Going to save you a lot of headach. 1) change to thicker oil and new oil filter. See if the helps. 2) since you are getting oil pressure when driving fast, it's not the oil pump. Change out the oils sending unit. See if this helps. 3) oil pan area. Change or clean out oil pick up screen. See if this helps. 4) check your oil guage cluster to see if it's working correctly. See if this helps. 5) here's the bad news of all else fails than it's your worn out cam bearings. Meaning engine rebuild. If you know somebody you can get it done cheap like I did or you can spend more than the price of your cars worth. That's all to it. I went through all of them and finally got it fixed. 2005 Tahoe with 200,000 miles on it.

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