I have a buddy that just bought an '05 with less than 100,000 miles. When he was driving the truck home from buying it the oil pressure gauge dropped to zero and a warning noise started. He called the buyer and he said he forgot to mention that the gauge would go out intermittently, but it was checked out and just needed a new sensor. He wanted the gauge working so off to the dealership to get a new sensor, now two sensors later and they are telling him that the ECM is bad and want to replace it to the tune of $1800. They have hooked up a mechanical gauge and the oil pressure is fine. I have searched and cannot find anything related to the ECM being bad when the oil pressure sensor is not working. My thoughts are it is possibly the harness to the sensor shorting out as it is only an intermittent problem, but I am not electrically inclined. Can anyone give me some first hand knowledge of what his problem may be and is it common for the ECM to be bad? Thanks in advance for any and all info.
Oil Pressure Gauge Help Please
- Thread starter Sea Hoss
- Start date
I believe a lot of times it's there stepper motor that runs the gauges on the instrument panel that goes bad when they do that. Surely the dealership would have caught that though.
I sure as hell wouldn't spend that kind of money to replace the ECM when you can just get run a manual oil pressure gauge instead.
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I sure as hell wouldn't spend that kind of money to replace the ECM when you can just get run a manual oil pressure gauge instead.
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I agree with you on the mechanical gauge! He is a new diesel owner and wants everything on his "new" truck to work properly. I don't think it is the stepper motor as he is getting the audible warning and DIC alert, from what I can find if it is the cluster you won't get the audible or DIC alarm.
Throw a mechanical pressure gauge on it.. OEM electrical sense could be going out.. not comm but has happened..
There is a 10mm allen 1/2" NPT plug on the oil filter housing.. visible through DS fender well.. will need to pull liner to get to it... it is red lock tite in, so most likely need some heat as well.
Pick up any 0-100psi $15-20 oil pressure gauge from any parts store.
There is a 10mm allen 1/2" NPT plug on the oil filter housing.. visible through DS fender well.. will need to pull liner to get to it... it is red lock tite in, so most likely need some heat as well.
Pick up any 0-100psi $15-20 oil pressure gauge from any parts store.
I wouldn't be surprised if one of the sensor wires got pinched where they come up from underneath behind the accessory bracket. I would definitely look at the wiring really carefully before I put an ECM in it.
Thanks for the replies everyone, there has already been a mechanical gauge installed and oil pressure is normal. I'm pretty sure this is an electrical issue but wanted to research if anyone has had an ECM failure associated with the gauge failing. Through what I can find no one has reported a new ECM solving the problem. I think the Dealership is just stabbing in the dark and hoping the ECM will fix it at the expense of $1800 to my buddy.
Either this^ or the stepper motor in the cluster. I just rebuilt a lmm and had no oil psi showing on dash bit it obviously had oil psi cuz vanes were cycling. Ended up smashing the harness that comes up from oil level sensor, press sensor, and drivers side ground with the a/C & pwr steering accessory bracket
i have a truck right now with a dead oil pressure gauge from a bad stepper motor and it does not ding at you or claim low oil pressure so i wouldnt say its the stepper but weirder things have happened.
i would hook a scanner to the truck and verify the oil pressure reading from the ECM is showing the same as the gauge or not. if it shows pressure and does not drop out after some test driving, its most likely the stepper. if it doesnt and shows 0 like the gauge, start looking for wiring issues and verifying voltage/ohming out wires in the areas josh stated. its easy to pinch those wires in the brackets if they have come off for some reason at some point. it could be an ECM but you can pick up used good ECMs for a couple hundered bucks and have it flashed with the correct OS for the truck for well under 1800.
i would hook a scanner to the truck and verify the oil pressure reading from the ECM is showing the same as the gauge or not. if it shows pressure and does not drop out after some test driving, its most likely the stepper. if it doesnt and shows 0 like the gauge, start looking for wiring issues and verifying voltage/ohming out wires in the areas josh stated. its easy to pinch those wires in the brackets if they have come off for some reason at some point. it could be an ECM but you can pick up used good ECMs for a couple hundered bucks and have it flashed with the correct OS for the truck for well under 1800.
The pinched wires on the this LMM i'm working on did not bring up warning on DIC either. Just gauge pegged at zero.