Hello everyone! I have a 2004 LLY. My oil pressure gauge will usually read normally for the first 15-30 minutes of a drive. Then it'll read pretty much 0 psi. Sometimes it stays somewhere between 0 and 60psi. Sometimes the needle responds to engine RPM's and sometimes it does not. If I park the truck for a little while and then start it back up again, it'll usually be normal for another 15-30 minutes. If I only park for a short time, it may not recover at all.

Question is, if I were REALLY running low oil pressure, would a text message flash in the display where the "change engine oil" message appears? Would the system also set off a chime like when you're low on fuel?

None of these things have happened so, given that, is it safe to assume that the engine is not having low oil pressure? Also, it seems like this would indicate that the sending unit is good too.

Do you all think that this only leaves the instrument cluster as the culprit?

Thanks in advance!
Trodrig

My oil gauge just started pegging out last week. the first day it pegged right. The next time it worked correctly. Now it's just pegged at about the 5 o'clock position. I'm assuming the stepper motor in the dash. Will probably buy seven motors for future failures.
All the gauges use the same stepper motor.
I'm with you, 'assuming' a 'low oil pressure' warning would come on if my pressure was '0'.

Searching last night I found a DIY thread on changing out the stepper motors. However, now I can't find it. Does anyone have the link?

Also, can anyone confirm my theory that the computer would display a message and set off an audible alarm if the engine were truly running low oil pressure?

Thanks!
Trodrig

When I bought my truck with 91k, on the very first day of driving it I noticed it was fine at start up but by the end of the day it was almost flatlined. I called the guy back that I bought it from and he said "oh yeah, it does that but theres nothing wrong with the pressure. I just never took the time take it back. It's under warranty" So I took it by the dealer, and it was something they had to replace in the gauge cluster. Worked fine since then.

Searching last night I found a DIY thread on changing out the stepper motors. However, now I can't find it. Does anyone have the link?

Also, can anyone confirm my theory that the computer would display a message and set off an audible alarm if the engine were truly running low oil pressure?

Thanks!
Trodrig
http://www.dieselplace.com/forum/showthread.php?t=140580&highlight=replace+gauge+steppe

Trodrig -- You asked: "Also, can anyone confirm my theory that the computer would display a message and set off an audible alarm if the engine were truly running low oil pressure?"

If the stepper motor is bad the gauge will show zero, or maxed out, or whatever but there would be no LOW OIL PRESSUE message or "dinging" if the oil pressure is within limits. The "message" and "dinging" is triggered by the data stream not the position of the oil gauge needle.

I'm having the same problem with my oil pressure gauge, except mine is triggering the low oil pressure light & the chime. As the speedometer was wacked out also, I took it to the dealer to have the cluster replaced. So now the speedo works, but oil pressure gauge still doing the same. Replaced sending unit, still no change. Any ideas what to do next?

I'm having the same problem with my oil pressure gauge, except mine is triggering the low oil pressure light & the chime. As the speedometer was wacked out also, I took it to the dealer to have the cluster replaced. So now the speedo works, but oil pressure gauge still doing the same. Replaced sending unit, still no change. Any ideas what to do next?

I would watch my oil pressure with my tuner (EFI) and log it, you may need a new pump. Pretty uncommon, however.

Most likely a cluster issue. Seems this was an issue with the 04-05 trucks. Have to replace cluster for fix IIRC.

Most likely a cluster issue. Seems this was an issue with the 04-05 trucks. Have to replace cluster for fix IIRC.

A bad cluster doesn't throw the low oil pressure/chime on the DIC, only a bad sensor or bad pump would. Correct?

cluster should not set off lights or chimes

First thing this morning and for the rest of the day this same issue began in my 05 silverado with 68k miles. Until I read this I just kinda figured it was a bad sending unit of some sort. Now I'm a little unsure.. Is it my oil pressure sending unit or is it a problem in the gauge cluser?

The gauge usually works for a short period of time, then gets stuck between 0-60, then reads zero. Sometimes switches back and forth.

p.s. no lights or chimes.

my oil pressure gauge does the same thing i start the truck and it pegs out right away and stays there until i shut the truck off i took my truck to a shop and the said my oil pressure is fine that its just the cluster and said that it would cost around $400 for the part and for them to put it in i didnt feel like spending that kind of money if it was just the cluster so now i ignore it but is there a cheaper fix than what the shop told me also no lights and no chims

Search for the stepper motor replacement in the DIY section. Common problem.

thanks rebel that doesnt look to bad ill have to give that a shot

were can you get the stepper motors do most auto part shops carry them or do i have to go to the stealer

http://www.dieselplace.com/forum/showthread.php?t=129864

Try this thread, it appears they have found a supplier for the motors.

I have known several people including myself that have had this problem. The problem we have found is that the ground signal for the sensor runs through the main multipack
connectors. (above the LH valvecover) the wire breaks in that connector. It is the top connector. attempt to wiggle connectors or wires and see what that does to your gauge

thanks for the info guys redmax ill give that a try before i order a motor

Well I checked the wire connections and no change with the gauge so it must be the stepper motor also in my first post I messed up the gauge is always peg out it dosent move when I shut the truck off and what I mean by pegged is past the 120 the needle is as far right as it can possibly go it's pointing at the little oil can symbol not sure if that means anything but thought I would throw it out there thanks again

I have known several people including myself that have had this problem. The problem we have found is that the ground signal for the sensor runs through the main multipack
connectors. (above the LH valvecover) the wire breaks in that connector. It is the top connector. attempt to wiggle connectors or wires and see what that does to your gauge

I would think this would set off the chimes and DIC, as this feeds the ECM the main signal for Oil Pressure.

Well I checked the wire connections and no change with the gauge so it must be the stepper motor also in my first post I messed up the gauge is always peg out it dosent move when I shut the truck off and what I mean by pegged is past the 120 the needle is as far right as it can possibly go it's pointing at the little oil can symbol not sure if that means anything but thought I would throw it out there thanks again

It's your stepper motor. Mine is past the 120 mark also.

I screwed up a year ago and only changed the one in my speedometer. Now my oil pressure is doing the same thing. I guess I'll change them all this time.

It's not that hard if you have the right equipment. If you never worked on a circuit board, you might want to find a piece of junk to practice on.

It's your stepper motor. Mine is past the 120 mark also.

I screwed up a year ago and only changed the one in my speedometer. Now my oil pressure is doing the same thing. I guess I'll change them all this time.

It's not that hard if you have the right equipment. If you never worked on a circuit board, you might want to find a piece of junk to practice on.

Yeah I figured it was the motor I will try to swap motors soon thanks guys appretiate all the help