2005 Yukon, oil pressure pegged at 80

[motamir]

My oil pressure gauge is pegged at 80- just started yesterday with a low pressure warning as I was driving and it swung back and forth and now is sitting at 80 whenever it's powered up (zeroed when off).

I'm assuming it's the gauge, not something else- is that a good assumption? Or could it be something else? How much do I need to worry about this?

 

[mattbta]

Two possible problems: oil pressure sending unit on top of the engine at the back of the intake or a bad stepper motor in the cluster.

 

[HiHoeSilver]

My oil pressure gauge is pegged at 80- just started yesterday with a low pressure warning as I was driving and it swung back and forth and now is sitting at 80 whenever it's powered up (zeroed when off).

I'm assuming it's the gauge, not something else- is that a good assumption? Or could it be something else? How much do I need to worry about this?

Does it go to 80 with key on, engine OFF?

 

[motamir]

Does it go to 80 with key on, engine OFF?

Yes it does. And when it starts, it goes back to zero and then swings back to 80.

 

[SnowBuck]

My oil pressure gauge is pegged at 80...

Check my old Thread on this. SAME problem...was the sending unit on the top back of the engine. It always stayed around 40 for years...seems THAT should have been an indication its bad...s/b more like 60 when cold or high speed...40 at idle warmed up.

 

[HiHoeSilver]

Yes it does. And when it starts, it goes back to zero and then swings back to 80.

If it is showing pegged with the engine off, it is almost surely the sending unit. Just make sure you use AC Delco replacement. Many problems noted with the aftermarket ones. If you search, there are many conversations regarding changing it. Got mine sitting on the bench waiting to be installed...

 

[motamir]

Thanks all! I appreciate the help

 

[SDuncan2006]

Yep...sending unit all right. It's not as hard to replace as some claim.

 

[SDuncan2006]

......you will need a rag-joint on your socket though

 

[jaywoo65]

You'll need something similar to this, the socket came from autozone. It's made for the oil pressure sender.