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2005 GMC Envoy Flashes Low Oil Pressure Only at Startup"


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MarineGrunt
Enthusiast
MarineGrunt profile image

Feb 8, 2013, 8:09 AM

Post #1 of 11 (4208 views)
2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

2005 GMC Envoy XL SLT
4X4
4.2L
83K

Hope everyone is doing well. Got called out for a couple jobs so have been pretty busy lately.

I'm having an issue with the wife's Envoy. If you turn the key to the accessory position, wait a few seconds, and then start it the dic flashes the miles and then flashes "oil pressure low" for a second. It then goes right back to the miles and doesn't say it again. This is where it's a little odd. If you don't put the key in the accessory position first and just start it all in one motion the dic does not flash "oil pressure low". It just goes right to the miles as it usually does. If one of the doors is open and you let the key sit in the accessory position for a second it flashes the miles, passenger door ajar, and then back to the miles. It won't flash the oil pressure low. The oil pressure gauge reads as it always does and appears to be operating normally. Oil level is good. I use Mobil One Extended Performance and it has about 2800 since its last oil and filter change. There are no codes stored. It's running and starting fine, and besides the quick flash of "oil pressure low", has no noticeable issues.

I'm guessing you'll recommend checking oil pressure. I'll have to pick up a tester sometime today. I've never had to check oil pressure with any of my vehicles in the past so a quick walkthrough would be appreciated. I assume you let the vehicle get to normal operating temperature, hookup gauge to sending unit and start it up?

Is it possible it's a bad sending unit? Is there any other thing I should be looking for or checking?

Thanks for the help!


Hammer Time
Ultimate Carjunky / Moderator
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Feb 8, 2013, 9:34 AM

Post #2 of 11 (4180 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

You can hook it up cold sand watch it as the temp rises but I'd put my money on a bad sensor or cluster.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



MarineGrunt
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Feb 8, 2013, 10:26 AM

Post #3 of 11 (4173 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

Makes sense. If the pressure was low I'm sure the oil lamp would light up along with the "oil pressure low" constantly showing on the dic. The gauge should also read low but is reading exactly what it always does.

Is there a way to test the sensor or should I just go ahead and replace it? I'd rather start there since it's the cheaper part. Although, the cluster would be easier to swap out.

Where should I start HT? Thanks for the help.


Discretesignals
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Feb 8, 2013, 10:57 AM

Post #4 of 11 (4170 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

The engine computer monitors engine oil pressure from the same sensor the gauge uses. There could be a trouble code stored for the EOP sensor.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 8, 2013, 10:57 AM)


MarineGrunt
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Feb 8, 2013, 12:43 PM

Post #5 of 11 (4158 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

I scanned it for codes last night and it didn't have any stored. Do I need a high end scanner or would my basic scanner have picked it up?

It was a touch low on oil so topped it off last night. Maybe half a quart. I figured it would be fine for the wife to drive it to work so maybe it will "reset" itself during the drive. Since the "oil pressure low" only came up for a second at startup I didn't figure it was anything too serious. She'll be home around 4 so I'll check it out then.

Thanks guys.


MarineGrunt
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Feb 8, 2013, 5:37 PM

Post #6 of 11 (4143 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

It's still doing the same thing. Wishful thinking I guess.

If the oil pressure sensor controls the gauge too and it seems to be working properly do you think it's the cluster? Is there anyway to test or troubleshoot the problem?


Discretesignals
Ultimate Carjunky / Moderator
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Feb 8, 2013, 5:57 PM

Post #7 of 11 (4135 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

The PCM is what sends the message to the instrument cluster's driver's information center to flash the message "low oil pressure stop engine". You would have to monitor the EOP pid at the PCM, but it is going to require a high end scan tool that can access the manufacture side of the PCM.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 8, 2013, 5:58 PM)


MarineGrunt
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Feb 8, 2013, 9:17 PM

Post #8 of 11 (4124 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

Mine doesn't say "stop engine" afterwards but maybe since it's only coming up right at startup and then goes right back to mileage it isn't up long enough show the whole message.

Sounds like I'm gonna have to bite the bullet and take it somewhere. You know DS. Central IL is a great place to vacation in February. Well, that is if you can get past the 20 degree days, 0 degree nights, -20 wind chill, rain, ice, and snow. Oh, plan on being bored too since there isn't crap to do here. By the way, don't forget to pack your scan tool.


Hammer Time
Ultimate Carjunky / Moderator
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Feb 9, 2013, 4:20 AM

Post #9 of 11 (4114 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In


Quote
Central IL is a great place to vacation in February. Well, that is if you can get past the 20 degree days, 0 degree nights, -20 wind chill, rain, ice, and snow.



And that's why you have so many car problems.

I'm going to get some sun at the pool now. (the beach is too crowded with with people from up North)



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



MarineGrunt
Enthusiast
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Feb 9, 2013, 10:08 AM

Post #10 of 11 (4105 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

 
"I'm going to get some sun at the pool now. (the beach is too crowded with with people from up North)"

Must be nice......... smart@ $$ ........Tongue


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 9, 2013, 11:18 AM

Post #11 of 11 (4100 views)
Re: 2005 GMC Envoy Flashes Low Oil Pressure Only at Startup" Sign In

Yep, sure is.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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