# 2012 GMC 1500 - oil pressure readings vary

**URL:** <https://community.cartalk.com/t/2012-gmc-1500-oil-pressure-readings-vary/177804>\
**Category:** Maintenance/Repairs\
**Tags:** gmc, 1500\
**Created:** [July 2, 2021, 12:15pm UTC](https://community.cartalk.com/t/2012-gmc-1500-oil-pressure-readings-vary/177804 "2021-07-02T12:15:31Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bryanbetts](https://avatars.discourse-cdn.com/v4/letter/b/b38774/32.png) [@bryanbetts](https://community.cartalk.com/u/bryanbetts)\
**Post date:** [July 2, 2021, 12:15pm UTC](https://community.cartalk.com/t/2012-gmc-1500-oil-pressure-readings-vary/177804/1 "2021-07-02T12:15:31Z")

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oil pressure at low speed reads 120 increase revs oil pressure drops to zero

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**Author:** ![ledhed75](https://avatars.discourse-cdn.com/v4/letter/l/f6c823/32.png) [@ledhed75](https://community.cartalk.com/u/ledhed75)\
**Post date:** [July 2, 2021, 4:30pm UTC](https://community.cartalk.com/t/2012-gmc-1500-oil-pressure-readings-vary/177804/2 "2021-07-02T16:30:18Z")

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I assume you’re reading this oil pressure from the gauge on the dashboard.

Get a mechanical oil pressure gauge, and test the oil pressure. Could just be a fluke, or your dash gauge could be going out. Or, your oil pump could be on the way out, but oil pumps don’t often go bad.

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [July 2, 2021, 4:58pm UTC](https://community.cartalk.com/t/2012-gmc-1500-oil-pressure-readings-vary/177804/3 "2021-07-02T16:58:07Z")

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Some GM gauges will read full scale (120 PSI) when there is an open circuit, replace the oil pressure sending unit.