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Old 12-09-2013, 04:32 PM   #1
Join Date: Jul 2009
Location: NE Wyoming
Posts: 328
No oil pressure at start up

Twice in the last couple months, when I first start my Jeep, the oil pressure gauge will not move, and the yellow check engine light is on. Both times the engine ran less than 30 seconds before I shut it off. Both times, I immediately restarted with no issues.

I have a 06 LJ Rubicon, 4.0, auto, 78000 miles. Both times were extreme cold -5 and -22 (yes -22). I'm hoping it's just cold electronics/wiring/connection on the oil sending unit. Any ideas?

BTW I run synthetic oil.

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Old 12-09-2013, 05:12 PM   #2
_plaisance's Avatar
Join Date: Jan 2013
Location: southern louisiana
Posts: 479
i noticed on really cold days to us... which aint much because im in south louisiana but my oil pressure likes to drop to 0 i have a new sending unit im thinking about just replacing it. but i think your problem is that the oil is cold and very thick like molasses at startup making it hard for it to move around quick and create pressure im no expert on this subject but thats what it appears to be.

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Old 03-02-2014, 09:54 PM   #3
Brit Nick's Avatar
Join Date: Jun 2012
Location: Gillette, WY
Posts: 548
Oil pressure sending unit. Mine does the same thing
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Old 03-02-2014, 10:04 PM   #4
Knows a couple things...

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Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,885
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Yep before assuming the worst, replace your oil pressure sending unit with a fresh Mopar OE sending unit. Don't waste your time with one from Autozone or similar, they have crappy quality and cause too many problems. It took three Autozone oil pressure senders one Sunday to get my son's oil pressure gauge working properly. If it had been any other day of the week I would have gone to the dealer for the sender.
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