Pegged engine oil gauge

[Trackman]

My 2004 Tahoe has been a faithful servant since I bought it new in'04. Oil change every 4K miles, not a hint of oil consumption or trouble. Yesterday I had a few new engine oil drops on the garage floor. Never has leaked prior. Wiped them up took a test drive and noticed my oil pressure gauge was pegged at 80lbs. No more leaks however gauge stays pegged ?

Ideas/comments?
Thks
The Trackman

 

[justirv]

My 2004 Tahoe has been a faithful servant since I bought it new in'04. Oil change every 4K miles, not a hint of oil consumption or trouble. Yesterday I had a few new engine oil drops on the garage floor. Never has leaked prior. Wiped them up took a test drive and noticed my oil pressure gauge was pegged at 80lbs. No more leaks however gauge stays pegged ?

Ideas/comments?
Thks
The Trackman

Not sure on pressure gauge pegged, my first thought is faulty sensor or perhaps internal debris (?). On the oil drip/leak, check the "oil cooler" block-off plate, they are notorious for warping, next to the oil filter on the side of the block.

 

[Trackman]

Not sure on pressure gauge pegged, my first thought is faulty sensor or perhaps internal debris (?). On the oil drip/leak, check the "oil cooler" block-off plate, they are notorious for warping, next to the oil filter on the side of the block.

Thanks for your reply - yes my shop says they replace those oil pressure sensors often. Scheduled into shop this week, will look for leaks in the area you mention.

 

[Fless]

Turn the key to "run" without starting it, and see what the oil pressure gauge reads. If more than zero, suspect the sender or its circuit, or less likely the gauge's stepper motor (in the cluster).

 

[InterceptorF]

You may have a bad cluster/oil gauge. If you take the gauge cluster out ( not very hard to do) there is a little white POS "reciever" ( the gauge itself) soldered to the circuit card. You can get them on Amazon or Ebay for cheap ~ $5.00. There are four solder joints to unsolder and it pops off the circuit card. I've had the same issue with my 2004 Pontiac Montana - speedometer, my 1997 Chevy S10 - temp, my 2003 Tahoe - oil and my 2001 Yukon XL - oil. TOnce its replaced you'll need to "adjust" the needle position. I have a mechanical aftermarket gauge I use connected to to the driver side bolt in the block near the front that I tapped on the YukonXL to verify the correct pressure and then set the cluster gauge needle depending on what it showed. On my 2001 YukonXL, I installed a Melling high output oil pump and when I verified the oil pressure. I was at 45 PSI cold where the cluster gauge was saying pegged; or you can order the whole cluster for ~ $250.00 and hope that fixes it. Also if ALL the gauges start fluxuating like crazy, there is the block ground behind the intake by the sending unit that is probablt not connected or is loose. Ive had that happen as well.

 

[jfoj]

@Trackman

Not sure if you have this issue resolved yet.

If you have a 6.2l engine, it has a 2 Stage oil pump with an electrically controlled solenoid that will trigger the oil pump to increase to around 80 PSI. I think the default state if the wiring gets knocked off or has a bad connection is for the oil pressure to go high.

As I recall the solenoid is not sold separately, it is part of the oil pump assembly, unclear if you could unscrew the solenoid and swap it, otherwise oil pump replacement is a rather involved job.

If you have a 5.3l, I believe since 2021? they did away with the 2 stage oil pump on the L84 engine.

A higher end scan tool can also read the oil pressure from the data buss to determine if the problem is the dash display, but I assume with a 2024 Tahoe the dash is electronic rather than an older analog motor driven gauge?

 

[Fless]

@Trackman

Not sure if you have this issue resolved yet.

If you have a 6.2l engine, it has a 2 Stage oil pump with an electrically controlled solenoid that will trigger the oil pump to increase to around 80 PSI. I think the default state if the wiring gets knocked off or has a bad connection is for the oil pressure to go high.

As I recall the solenoid is not sold separately, it is part of the oil pump assembly, unclear if you could unscrew the solenoid and swap it, otherwise oil pump replacement is a rather involved job.

If you have a 5.3l, I believe since 2021? they did away with the 2 stage oil pump on the L84 engine.

A higher end scan tool can also read the oil pressure from the data buss to determine if the problem is the dash display, but I assume with a 2024 Tahoe the dash is electronic rather than an older analog motor driven gauge?

He has a 2004. None of this applies. And he hasn't been on since the end of March.

As to the scan tool, the NBS years don't have a PID for reading oil pressure in PSI. There is one, however, for sensor voltage.

 

[jfoj]

My bad, That's what happens when you wake up at 4:00 in the morning I guess!