Jump to content

05 Silverado possible false oil pressure reading?

Brad OSullivan

Recommended Posts

Brad OSullivan Enthusiast

Brad OSullivan

Posted
Posted

New to the forum here, and I have a 2005 chevy silverado 1500 with the 5.3L. I drive to and from michigan from chicago for college every couple of weeks. The last time I drove up to michigan 2 hours into my drive the oil pressure gauge started slowly moving down from 40psi. Every 10 minutes it seemed it moved down a notch until it got to 15psi and then I pulled over just to investigate because the truck was running perfectly normal and no warning lights or anything were on. I did a walk around, no leaks, no engine noise and the oil level was in the same place as when I left. Also when I stopped the pressure gauge dropped to 0 at idle and the truck idled normal. I continued to drive till i got to my destinations 30 minutes later. The next day when I started it back up the oil pressure is now reading normal and has read normal for the last week. I went to tech school and I know my way around an engine and i'm almost positive this isn't a mechanical issue, im thinking its the oil pressure sensor or sending unit or it could be the gauge itself because first gen silverados are famous for bad gauges but i feel if it was a bad sensor there would be warning lights? Not sure though, any of you guys experience an issue like this or have any idea of what to check or what it could be?? Much appreciated!!

muddkatt Senior Enthusiast

muddkatt

Posted
Posted

Probably a bad stepper motor, but it is possible for a filter to be stopped up, oil pump failing, etc. Hook a mechanical gauge up to verify oil pressure.

carkhz316 Enthusiast

carkhz316

Posted
Posted

If the oil sending unit is is reporting 0 psi oil pressure, you'll get a warning in the driver info center in addition to the gauge readout. Plus, it would be knocking/ ticking like mad. I will bet money that it is the stepper motor that is failing. I rebuild these gauge clusters as a side hobby and it's very common.

Brad OSullivan Enthusiast

Brad OSullivan

Posted
  • Author
Posted
9 minutes ago, carkhz316 said:

If the oil sending unit is is reporting 0 psi oil pressure, you'll get a warning in the driver info center in addition to the gauge readout. Plus, it would be knocking/ ticking like mad. I will bet money that it is the stepper motor that is failing. I rebuild these gauge clusters as a side hobby and it's very common.

Yah that's what I figured, is it weird that the gauge has been reading normal you think or no??

Brad OSullivan Enthusiast

Brad OSullivan

Posted
  • Author
Posted
2 hours ago, muddkatt said:

Probably a bad stepper motor, but it is possible for a filter to be stopped up, oil pump failing, etc. Hook a mechanical gauge up to verify oil pressure.

Yah good idea I forgot about that. 

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • needafix
      2019+ Brake failure, it's complicated

      By needafix · Posted

      I'm not sure if this should be a new topic, let me know if it's out of place. This my first post. Thanks 85077522 - AC Delco GM Genuine Parts Brake Master Cylinders. Anyone else had to replace this brake master cylinder yet. I didn't do any brake work, it looks like new parts and I've had the truck for about 4k miles, 119k total miles.  When it started to throw codes I did the calibrations with a bidirectional scanner and got the codes to clear but they came back so I did the routine; base bleed, automated bleed and final base bleed. All that with Bosch ES16-32N fluid (please look it up). That seemed to fix it but 100ish miles later it failed again so I ran the same process but with a pressure bleeder this time and got the same results, fixed for 100ish miles. The original fluid looked bad and I thought I got most of it out, it could've been the wrong fluid. The codes; P25A2, C05B0-00, C2A1B. I can get them to clear but not for long. The C05B0 indicates a leak in the front circuit (which is bone dry) so I'm thinking of doing the bleed process on that front again today and I don't know if that's taboo to just do the front but at this point it seems like it's worth the try anyway. The new master cylinder/module unit is supposed to get here today. But now I'm pretty much convinced this install is over my head. I've called several shops and some mobile guys that I know but this thing is like radio active material, scary wise. I did get 2 local shops say they should be able to do it, one says he has the SPS2 programing capability. And with the battery disconnected is there supposed to be pedal resistance, mine is to the floor, then if I pump it I can get some resistance. I had a panic stop prior to this issue which may have contributed from what I read. And on the first attempt to bleed and hydraulic test the scanner listed things to look for and one was any gaps between the pad and rotors which I did notice on the RF corner and I removed the outer pad (where the gap was) cleaned it and the hardware and didn't see a gap after that but will re-check it. I read that if pushing the caliper pistons back then you're supposed to open the bleeder so as to not push fluid backwards into the abs module or it will damage it. If that's true then that's also a possibility from the previous owner having the brakes changed before I got it. I'm using an XTool ip500 scanner. Any suggestions, questions and comments welcome. 
    • Donstar
      Navigating senior years.

      By Donstar · Posted

      Next Friday will be my 6 week point from my right knee replacement.  The surgeon says it will be fine if I choose to drive after this checkup.  I know I could drive now but best to do as my surgeon (and my wife) tell me.  Richard compared being 62 to 72.  I remember when I was in my early 60's I was experiencing slow but regular decline in my mobility.  Thanks to good medical support,  i continued to fight the speed and spread of this decline. During my 60's I worked on non-surgical methods and just when I turned 70, my orthopedic surgeon recommended joint replacements.  In a little over a year, I had one shoulder and both knees replaced.  This hasn't been a terribly fun experience, but worth the discomfort as my future mobility health trajectory has reversed.  It is a treat to now be watching my mobility. balance and confidence steadily improve!
    • Another JR
      Trailer TPS Sensor Question Rim Size

      By Another JR · Posted

      Grommets with the right cement should be perfectly fine. 
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      This is going to take allot of Assembly    
    • PunchT37
      Transmission Temperature Hitting 220s

      By PunchT37 · Posted

      Why do they have the gas 10l80 opening at 145?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...