Oil pressure

Asked by Mar 14, 2017 at 05:48 PM about the 2002 GMC Sierra 2500HD

Question type: Maintenance & Repair

I have an 02 Duramax that the oil pressure gauge
us not reading and I'm thinking that's what's
causing my truck not to start. Right before winter I
tried to start my truck it started , two seconds after
it died and hasn't started since. It's been sitting all
Ohio winter. I bought two brand new batteries that
wasn't it. I noticed my pressure gauge isn't reading
at all. Normally when I would start my truck the
gauge would go up, as my truck warmed up it went
down . As I drove it would rise as my foot was on
the pedal. Long story short I think it's something
involving my oil. But i don't know what and don't
have the money to pay a mechanic, . If someone
could help me diagnosis or even help me begin to
look in the right direction it would really help.

2 Answers


I guess I would try replacing the oil pressure sending unit. You also should check the oil pressure with a mechanical gauge, even if it does not start, it should show something on the gauge when turning it over.


If you're saying the pressure used to drop and go up as your foot was on the gas pedal, that indicates pressure dropping as idle in low meaning you have internal engine wear, possibly main or rod bearing that is causing pressure to drop. Do a compression test and see if it's low. It could be that the timing chain has jumped a tooth as part of internal engine wear. I've seen it do that on a 2005 ford where it was running, they went to the store and when they turned off engine, it wouldn't start back up, chain had jumped a tooth.

Your Answer:

GMC Sierra 2500HD Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Chevrolet Silverado 2500HD
12 Great Deals out of 1,071 listings starting at $6,950
Used Ford F-250 Super Duty
23 Great Deals out of 761 listings starting at $4,500
Used GMC Sierra 1500
59 Great Deals out of 10,152 listings starting at $1,999
Used Chevrolet Silverado 1500
98 Great Deals out of 10,243 listings starting at $5,500
Used Dodge Ram 2500
73 listings starting at $7,500
Used Ford F-350 Super Duty
18 Great Deals out of 1,153 listings starting at $4,500
Used Ford F-150
113 Great Deals out of 11,465 listings starting at $2,700
Used Toyota Tundra
27 Great Deals out of 1,588 listings starting at $5,200
Used GMC Sierra 2500
9 listings starting at $3,995

Used Cars for Sale

2018 GMC Sierra 2500HD For Sale
934 listings starting at $30,995
2017 GMC Sierra 2500HD For Sale
5 Great Deals out of 65 listings starting at $33,000
2016 GMC Sierra 2500HD For Sale
67 listings starting at $31,888
2015 GMC Sierra 2500HD For Sale
3 Great Deals out of 91 listings starting at $25,995
2014 GMC Sierra 2500HD For Sale
19 listings starting at $19,998

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.