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Old 04-21-2008, 04:28 PM   #1
maswindell
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Default Replacing Oil Pressure sending unit


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I have an 04 Tahoe with the 5.3 motor and the oil pressure is either zero or over 100. There's plenty of oil and I assume the sending unit is bad. The Haynes manual is pretty bad as far as location. Where is it located ? I searched the top of the engine with no luck, is it underneath somewhere ?

Thanks
Mike
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Old 04-21-2008, 05:43 PM   #2
maswindell
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The local speed shop said the sender is by the oil filter - put the truck up on ramp and there is a fitting there but no sending unit. Where else do I look ?
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Old 04-21-2008, 08:22 PM   #3
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My 04 Tahoe had the same issue, except it stayed pegged over 100. The dealership replaced the gauge cluster. No problems since. If you think it is the oil pressure sensor, then check Haynes or Chiltons, they should be able to detail how to check the switch to see if the issues is there.
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Old 04-23-2008, 04:32 PM   #4
TXHorn
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My '03 has a similar issue: oil press warning came on & OP read zero, and then popped up to 80 (max on gauge). Never happened before & was about time for an oil change so I did so about a week ago. It then happened again (drop to zero, warning on, then back up to 80). Since I know the oil is fresh & full and the fact that it drops suddenly only to go back to normal, sounds like a sending unit/switch issue, or possibly a loose ground wire?

Found a new switch online for $30-36, but could use some help locating it as well.
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Old 05-02-2008, 12:13 PM   #5
kevincoop
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TX Horn,
Where did you find the pressure switch online. I have the same problem with an 06 I just bought and would like to try a 30 dollar part before having someone look at it.
They have mine at the dealership so I cant look for it, but if I find it when I get it back, I'll post.
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Old 05-03-2008, 11:04 PM   #6
lskipper
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For a 04 Tahoe. Hope this helps.
Attached Images
File Type: jpg oil pressure.JPG (62.3 KB, 449 views)
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Old 05-04-2008, 06:02 PM   #7
maswindell
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thanks for the pic, I'll take a look see and see if I can find it/
Cheers
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Old 05-04-2008, 08:08 PM   #8
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I would check with your local dealership on this issue. They had a recall on the gauge clusters in 2003 and 2004 models due to diffective clusters. I don't remmember how long they were honering this recall but making a phone call never hurts.
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Old 05-07-2008, 01:43 AM   #9
tspain
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The Special Coverage Adjustment for the IPC is 7 years, 70,000 miles, whichever comes first.

Call the dealer and give them your VIN and see if your truck is covered, or you can PM me your VIN and I'll check for you.
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Old 10-27-2008, 02:40 PM   #10
mstephens3701
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What part of the engine are we looking at in this picture? Is it the upper rear?
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