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PostPosted: Mon Jun 01, 2020 9:32 am 
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Year and Trim: 2002 Bonneville SSEi
Started car this morning to go to work and I get the "CHECK GAUGES - OIL PRESSURE" chime. Sure enough the gauge was at zero. The gauge cycled on power up but stayed at zero.
Yes, the car has oil. Not making any noises that would indicate no oil. I'm guessing bad oil pressure switch. Had one on the wife's car do the "full scale" thing, replaced it and was fine. Is reading ZERO a common failure mode, too.
I left it home to look at after work but how can I verify its a bad switch and the engine is actually getting oil? I can live without a gauge till I change it this weekend (have to change oil anyway). Just don't want to blow the engine up.
HELP!!!!


Last edited by Louiej99 on Mon Jun 01, 2020 9:57 am, edited 1 time in total.

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PostPosted: Mon Jun 01, 2020 9:51 am 
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You could try watching through the oil fill hole at idle to see if it looks like there is any oil movement. It won't be a gushing deluge, so look closely.

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PostPosted: Mon Jun 01, 2020 2:05 pm 
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I had one read zero for a second at random and throw that warning on the DIC screen. I'd bet it's the switch. Easy replacement, above the oil filter.

If the car had no oil pressure you'd know lol

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PostPosted: Mon Jun 01, 2020 3:53 pm 
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I have had one read zero and one read 120.
When it read zero it would ding and show up on the DIC.
I also bet it is the switch.
You would hear the engine knocking or rapping if there was no oil pressure.
I bought a 27mm deep socket which makes the job easier.
I think I have changed 4 or 5 over the years.


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PostPosted: Mon Jun 01, 2020 4:25 pm 
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Year and Trim: 2002 Bonneville SSEi
Yeah. Ordered the new switch and picking it up after work. Was just trying to avoid an hour of cursing and swearing crawling under the car after work. Done it before. Tight fit, but haven't done it enough times to justify buying a $15 socket. I either used an adjustable wrench or my giant channelocks and slowly worked it out. New one went in a lot faster.
I agree, it would be making all kinds of sounds of it really had no oil pressure. Just don't want to take any chances.


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PostPosted: Mon Jun 01, 2020 5:40 pm 
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Year and Trim: 2000 Pontiac Bonneville SSEi
I just replaced my pressure sender. I had recently replaced passenger CV shaft and the banging around apparently damaged the pressure sender. Rockauto time once again since they sold the AC Delco part. I did find a 1&1/16” socket in my tool bin thankfully. Adjustable wrench didn’t look fun on youtube videos. This failure does beg the question of the condition of your CV shafts? If they are sloppy, that sensor being so close is a likely victim? Best of luck. You are right, not likely to have no oil pressure, gear pumps don’t fail that way and the oil filter assembly has a bypass. If there were no pressure, your lifters would be clacking away fast!


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PostPosted: Mon Jun 01, 2020 7:12 pm 
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Year and Trim: 2002 Bonneville SSEi
Problem solved. Changed the switch and have oil pressure. Ended up using my giant pair of channel locks.


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PostPosted: Tue Jun 02, 2020 9:21 am 
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Nice!

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