Hey Guys, new here. While driving my 01 4.7l V8 Dakota it died on me and wouldn't start back up. Odometer reads "no bus" Took it in to dealer to get a diagnostic check, and they say bad pcm. Evidently oil got into the pcm and caused problem. They want $1060 to fix problem. I'm looking at
Hi. New to the forum. I have a 2001 with 218k. I am also having problems with oil in the PCM connector. If I clean out the oil in the connector, truck runs like a champ for a while until there is oil in it again. Where is the oil coming from?
i don't believe how that can even happen. its plugged in. even if you poured oil yourself over the connectors while its plugged in i would have a hard time believing it would get int here. so if you have an oil leak lets say, the chances that the oil flys around the engine bay and magically finds its way to the pcm, then INTO the the connectors it cant happen.
you would have to notice oil on the outside on the connectors for this to have any chance of happening.....do you?
i hope i dont come off as a dick, but i just cant wrap my brain our this.
I have no idea where the oil comes from. Connectors are dirty but not oily. No external evidence of oil. When engine quits I get the no buss message. I remove the connector closest to the firewall, clean out the oil and everything is ok until it happens again. First time it happened I couldn't believe it either.
I am also having a nobus issue with the random flashing warning lights going off. My PCM connector closest to the firewall is also oil soaked. I used electrical contact cleaner yet the problems persist. I replaced the power steering pressure sensor awhile back as it was pushing oil in to my harness and was making an erroneous o2 sensor code.
So it looks like my PCM is fried because of the oil. Is the oil coming from the replaced power steering pressure sensor or something else?
Originally Posted by thunder98110
oil IN the connections to the PCM??? not even possible.
So you have cleaned it out and it came back are you sure itís an oil not dirt water seeping out have you pried back the connector tape to see if the oil is in the wire harness maybe the wire harness is acting like a sponge and pulling the oil from some other place.
Or maybe the inside of the PCM has an oil inside it I know a number of electrical devices use oil as a coolant this could be the case its brown and looks like engine oil only because its old.
You have to have an oil leak on the back of the engine, getting on the wiring harness and it's 'wicking' up thru the wiring harness to the PCM connector. First try to locate the oil leak then cut and remove some of the tape around the wiring harness at the lowest point before it makes the turn up to the PCM. This will allow the oil to drain out before it can reach the connector. Di-electric spray cleaner should clean up the oil that's already there.
I would suspect you have an oil leak at the oil pressure switch or at the back of the intake manifold.
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