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  1. #1

    Oil Pressure Sensor Fuse

    Hello!

    Just wondering if something similar has happened to any of your cars, and as advice for others.

    2 weeks ago, on the highway, I floored it on 5th to overtake and suddenly, the oil pressure gauge starts flashing red. RPM Drops and engine shuts off, any attempts to start the car yield the same results (drop in RPM, and engine shuts).

    Upon research, the prevailing advice was to replace the oil sensor. So I buy a new sensor and the problem persists, my mechanic suggests checking fuses. Sure enough, the fuse for the oil pressure sensor is toast. Replacing the fuse solved the problem, so most probably my sensor was never bad in the first place.

    Enter last weekend, I go for a mountain drive, no issues, I miss a shift and overrev and the same thing happens (flashing pressure gauge and drop in rpm). Replacing the fuse fixed the issue completely. In such a situation i'm actually glad the fuse went, stopping the engine, but the first time it blew, I was well withing the bounds of what is safe.

    Does this happen alot? if the fuse pops again under normal conditions, should i be worried? ive included a photo to show which fuse is for the oil pressure sensor (the manual does a shitty job of describing it), will save you a trip to the garage and the cost of a new sensor.viper fuse 1.jpg
    2017 ACR Gts-R Pearlblue

  2. #2
    weird that something is causing the fuse to pop.. high oil pressure or RPM shouldn't do that. Id suspect a fault to ground somewhere.

  3. #3
    Honestly, with the oil issues some Gen 5s have had, I would change that oil, and inspect it. Send a sample out for testing. You're sure you're at a full 11 quarts, right?
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  4. #4
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    Quote Originally Posted by swexlin View Post
    Honestly, with the oil issues some Gen 5s have had, I would change that oil, and inspect it. Send a sample out for testing. You're sure you're at a full 11 quarts, right?
    For sure...you don't want to see any metallic sparkles in your oil. Chances are that everything is fine, but as a precaution I would go to Blackstones website and request a test kit. https://www.blackstone-labs.com/prod...ree-test-kits/

    Strange though that that the fuse is popping...some kind of short. I've had all kinds of weird crap with this car. From tire pressure sensor & window module to Uconnect issues. Nothing is consistent. The electronics aren't ready for prime-time....D grade shit.
    Last edited by Gen5snake; 03-10-2020 at 07:46 AM.

  5. #5
    Enthusiast chris_lee's Avatar
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    This is a long shot, but I had a similar fuse issue with my Challenger. Turned out to be the aftermarket intake shield "under high RPM" was slightly shaving away at one of the sets of bound up engine harness wires. If you have anything aftermarket in there close to any sets of wires check for any sort of rubbing issues. Blowing a fuse vs just throwing a code is strange on this one.

  6. #6
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    It would be good to see the electrical schematic to see what components that fuse provides voltage and current for. Since it is listed as "ASD #2" (Automatic Shutdown #2) in the owner's manual , I suspect that the oil sensor is just one of several things that it is connected to that could be intermittent, including an intermittent short in the associated wiring. The oil pressure reading fluctuation was probably just one of several results of the voltage fluctuation, not the cause. If you can't find an exposed conductor on a wire that could cause a short; I would also change the ASD #2 relay just because it is a very easy thing to do, although I don't really think an intermittent short in a relay is a very high probability. You would also want to inspect any other components in that circuit first.
    Last edited by AZTVR; 03-10-2020 at 11:10 AM.
    Jim

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    You should not blow that fuse once let alone twice. I could accept if the fuse blew once maybe because the fuse was inherently weak but not twice. Twice tells me something is wrong, likely an intermittent short somewhere. Trace the sensor wire as far as you can and make sure it isn't frayed and shorting out. If you can't find the problem I would tell my dealer to check it out. Blowing the fuse should have nothing to do with the oil. Maybe the sensor but since you changed that already I would rule that out too.
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    Quote Originally Posted by swexlin View Post
    Honestly, with the oil issues some Gen 5s have had, I would change that oil, and inspect it. Send a sample out for testing. You're sure you're at a full 11 quarts, right?
    Quote Originally Posted by Gen5snake View Post
    For sure...you don't want to see any metallic sparkles in your oil. Chances are that everything is fine, but as a precaution I would go to Blackstones website and request a test kit. https://www.blackstone-labs.com/prod...ree-test-kits/
    The guy blew a sensor fuse twice. What are you guys going on about oil levels for?
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    Quote Originally Posted by txA&M08 View Post
    The guy blew a sensor fuse twice. What are you guys going on about oil levels for?
    Possibly related to his statement about missing a shift and over revving the engine ??
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  10. #10
    Enthusiast cashcorn's Avatar
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    another bad sensor? needs to be checked.

  11. #11
    Thanks for the replies, all helpful things to consider. Since aftermarket components could be the culprit here messing with the wiring I installed the following:
    1) Intake heat shield
    2) Oil Catch cans (driver and pass. side)
    3) Hi flow Cats
    4) trans and diff cooler
    * doubt it matters but just in case: 18 speaker upgrade, lithium battery)

    ALSO: This can actually be counted as the THIRD time the oil pressure gauge flashes red and shuts engine, I had come to as stop at gas station and put in neutral and then the flashing and shut down occurred, but this happened waaay back when all I had installed was the heat shield and catch cans, in this instance however FUSE DID NOT GO OFF, to me it was just a fluke, but it could be relevant.

    I guess ill have to check all wiring related to the ASD 2 fuse, if only i knew what else runs through there.

    Car runs beautifully otherwise, oil on SAFE every time i check, only problem to speak of is camera will not work once in a blue moon.

    Really love this car, so long as my problems remain minor im willing to deal with anything!
    2017 ACR Gts-R Pearlblue

  12. #12
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    Weird problem - I agree with others that it's probably a short somewhere. I don't know what other devices are powered by that fuse, but I'd suspect it's a bunch of different sensors. If the fuse goes, some critical sensor would go, and it isn't surprising that the engine would shut down.

    I had the same thing happen in a gas station. It freaked me out to no end - I just filled up, got in, and as I was leaving the oil pressure fluctuated wildly and the gauge flashed red. It only happened a couple of times, and everything checked out. When I brought it into the dealer, they said it was just a bad sensor. In your case, of course, it's more than that - and hopefully you can find the frayed wire.

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    The ASD fuse usually blows because of a shorted O2 heater wire. Is that really the fuse that blew? This was common on Gen 3/4 cars with headers. Heat would melt the O2 wire harness and the fuse would blow. Car would barely run if at all once the fuse blows. When that happens you usually throw a lot of codes. O2 sensors are 12V sensors not 5V like pretty much every other sensor.
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    Guys, what follows came from the "2017 Wiring Information Dodge Viper(ZD) WUSB" that I found at Tech Authority last year. I hope that I can accurately post the various components that are listed...though I do have a question about one which I will address later.

    The goal is to suggest target areas of possible wiring shorts for HolyDiver. Remember any mods and/or repairs CAN disturb the OEM wiring.

    ASD Relay #1 is protected by Fuse #26...and the potential trouble spots could be: Evap System Monitor Switch, Ignition Coils 1,3,5,7,9. Also Fuel Injectors1,3,5,7,9. Ignition Capicator, "Camshaft Position 1/2 Solenoid", Mass Air Flow Sensor, PCM, Oxygen Sensors 1/1 and 1/2.

    ASD Relay #2 is protected by Fuse # 27...and the potential trouble spots could be: Ignition Capicator 2, Ignition Coils 2,4,6,8,10. Also Fuel Injectors 2/4/6/8/10. Mass Air Flow Sensor 2, Oxygen Sensors 2/1 and 2/2, PCM, Skip Shift Solenoid, Reverse Lockout Solenoid.

    I would have guessed that ASD #1 would have included Crankshaft Position Sensor as well...as in past models. So, was this left out or was the reference to "Camshaft Position 1/2 Solenoid" a mistake that should have listed Crankshaft Position Sensor. This is beyond my scope...so...I'm depending on you guys for clarification.

    I apologize in advance if I have made any errors in the above listings.

    Best of luck, HolyDiver !!!
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    Quote Originally Posted by Steve-Indy View Post
    ASD Relay #1 is protected by Fuse #26...and the potential trouble spots could be: Evap System Monitor Switch, Ignition Coils 1,3,5,7,9. Also Fuel Injectors1,3,5,7,9. Ignition Capicator, "Camshaft Position 1/2 Solenoid", Mass Air Flow Sensor, PCM, Oxygen Sensors 1/1 and 1/2.

    ASD Relay #2 is protected by Fuse # 27...and the potential trouble spots could be: Ignition Capicator 2, Ignition Coils 2,4,6,8,10. Also Fuel Injectors 2/4/6/8/10. Mass Air Flow Sensor 2, Oxygen Sensors 2/1 and 2/2, PCM, Skip Shift Solenoid, Reverse Lockout Solenoid.
    So, if I interpret HolyDiver's photo correctly , I think he is blowing fuse 27. (need to verify that in the diagram in the top cover of the fuse box.) So, given lots of issues with burnt O2 sensor wire insulation as stated above, I would be looking at the wiring to the two O2 sensors on bank 2 (passenger side) first as prime suspects. Especially where the wires may be laying against hot exhaust.
    Jim

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    In an effort to add to this topic, I've recently also had the intermittent red flashing oil pressure gauge. That event has also shown the code P0521 "oil pressure sensor performance". Oil level has always been at safe zone on dip stick and is checked before and after engine shut down. I found it interesting that the on board computor would be able to show the known problem with these sensors.
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  17. #17
    Quote Originally Posted by AZTVR View Post
    So, if I interpret HolyDiver's photo correctly , I think he is blowing fuse 27. (need to verify that in the diagram in the top cover of the fuse box.) So, given lots of issues with burnt O2 sensor wire insulation as stated above, I would be looking at the wiring to the two O2 sensors on bank 2 (passenger side) first as prime suspects. Especially where the wires may be laying against hot exhaust.
    fuse2.jpg
    2017 ACR Gts-R Pearlblue

  18. #18
    My car does have Hi flow cats, I used 02 sensor spacers, but did not modify/protect the wires in any way. Ill have to check all the wiring, see whats the culprit, really weird how rare this issue is!

    Thanks!

    -HolyD
    2017 ACR Gts-R Pearlblue

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    Quote Originally Posted by HolyDiver View Post
    My car does have Hi flow cats, I used 02 sensor spacers, but did not modify/protect the wires in any way. Ill have to check all the wiring, see whats the culprit, really weird how rare this issue is!

    Thanks!

    -HolyD
    Really not that rare.
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    HolyDiver, did you identify the root cause of the blowing fuse?
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