Fix: Oil Pressure pegged at 80 PSI

stadt11

LetMeGoogleThatForYou.com
Joined
May 20, 2009
Posts
1,273
Reaction score
0
Location
Central Iowa
Common issue that happens on GMT 800/900 trucks

Parts:
  • Oil Pressure Sensor (GM 12616646, ACDelco D1846A) $25 eBay
  • Oil Pressure Switch Socket, Lisle 13250 (1-1/16"), $10 O'Reilly
20150617_081319.jpg



This is what the oil pressure gauge shows as soon as you turn the key to the On position:

20150616_182147.jpg



To diagnose the issue and verify it is the oil pressure sensor and not the stepper motor, first turn off the key then unplug the wire harness running to the sensor at the back of the block:

20150616_182537.jpg


20150616_182619.jpg



Turn the key back to the On position, if the needle now reads 0, the you know it's the sensor; if it still goes to 80, then it's your stepper motor.


I read other posts on the net where guys have said you need to remove the manifold, I can assure you, you do not need to do that, just be prepared to get your hand stuck a few times and cut them up really good, unless you have small hands as it's a very tight fit.


Get your Lisle socket, u-joint adapter, and enough 3/8" extensions to reach the sensor, you need to provide some torque to remove the old sensor:

20150616_183346.jpg


20150616_183654.jpg



Install in reverse order, don't forget to plug in the wire harness.


Turn the key to the On position, oil pressure should read 0:

20150616_184718.jpg



Start your truck and the gauge should read around 40 PSI:

20150616_184734.jpg
 

daddy

I'm too LAZY to Choose a Custom Title!!!
Lifetime Supporting Member
Joined
May 17, 2009
Posts
46,703
Reaction score
73
Location
Pawnee, IN
This site is for bullshitting and arguing, not for truck-related write-ups. Knock it off. :fume:
 

OldCracker29

I've been knocked down drug out and left for dead
Joined
May 26, 2009
Posts
76,683
Reaction score
693
Location
NE Ohio
Thanks Andy...this may come in handy some day. :thumbs:
 

Members online

No members online now.

Forum statistics

Threads
28,735
Posts
1,103,127
Members
4,709
Latest member
BeaGeiger9
Back
Top