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  1. #1
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    Default P0520 Engine Code

    I'm down to one trouble code to get rid of until I get that awesomely orange picture of an engine off of my instrument cluster. The code is P0520 and the wording is "Engine Oil Pressure Sensor/Switch Circuit Malfunction". I was wondering if anyone had run into this issue before and could give me some help as to fix it. Any and all help would be much appreciated.

    Adam - Wherever the Navy puts me
    2007 Chevy Silverado Regular Cab
    22x10 KMC LO-FI w/ 305/40R22 Yokohama Avids
    Ground Force 2"/4" Lowering Kit
    Eagle Eye Projector "Halo" Headlights
    RECON smoked tail lights
    RECON smoked third brake light
    De-Lettered
    De-Molded
    5.3L V8 Flex Fuel
    Banks Power Ram-Air Intake
    TEA Stage 1.5 Heads
    Comp Cams 54-450-11
    Dynatech Full Length headers
    Dynatech Intermediate pipe with hi-flow cats
    2.5" Single-in, Dual-out Magnaflow muffler
    296 rwhp
    306 ft-lb torque

  2. #2

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    Have you check the connection at the oil pressure sensor. Maybe it was loosened when the heads and cam was installed. I would get some CRC electrical cleaner and remove all the sensor wires and spray and clean them. Sometimes when those wires are disconnected for work on the engine they get some dirt and grease in them so they don't make a good connection. This is easy to do and MAY be the problem.

    ---------- Post added at 08:23 AM ---------- Previous post was at 08:14 AM ----------

    I see you have the TEA heads on your 5.3. I was wondering how they fit as I've read that the 5.3 cylinder bore was to small for a 2" and larger intake valve?

  3. #3
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    murdog94's Avatar
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    Default

    And if you clean everything and it still isnt repaired then there is chance that the Pressure switch went out, and its time to replace it.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  4. #4
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    Default

    I will check those connections today after I get home from work. As for my heads, I had them built with a 2" intake valve and a 1.57" exhaust valve at the recommendation of the tech rep I spoke to there. He said I shouldn't run anything bigger than 2" because I would get a shrouding effect from the intake valve being too big. I've been happy with them so far.

  5. #5
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    Default

    One question I had about those wires, where are they? I've been having a heck of a time finding any type of wiring diagram that I a) I understand and b) shows me where they are. Any help I can get would be awesome.

  6. #6
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    Default

    Alright so, cleaned all the electrical connections to the Oil Pressure Sensor - no change. Changed the Oil Pressure Sensor - no change. At this point I'm almost ready to give up and take it to the shop and let them figure it out. Any last minute words of wisdom?

  7. #7

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    Quote Originally Posted by adam0285 View Post
    Alright so, cleaned all the electrical connections to the Oil Pressure Sensor - no change. Changed the Oil Pressure Sensor - no change. At this point I'm almost ready to give up and take it to the shop and let them figure it out. Any last minute words of wisdom?
    Might be obvious but did you reset the computer by pulling the battery cable after you cleaned everything and replaced it?
    These oil sensors tend to go out quite often these days. They are only about $50, but are normally hell to get to.

    Goodluck,

    2009 Silverado 1500
    5.3L / 3.73 G80 / 4spd / 4x4 / LWB/ Ext Cab / HD Tow-Haul
    2.25in ReadyLift Level Kit / 3in blocks/ 3500lb HellWig / 265x65x17 Wrangler AT
    K&N Filter / AirRaid MIT / MagnaFlow 2.25" Dual Exhaust / HyperTech MaxEnergy

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