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2nd Gen Dakota 1997 - 2004 Dakota's

2001 Dakota PCM bad

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  #1  
Old 10-21-2010, 07:25 PM
Charvet7 Charvet7 is offline
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Default 2001 Dakota PCM bad

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

http://www.autocomputerexchange.com/Home

I get my pcm $165 free shipping.

Anybody heard of them? Also how hard is it to install a new pcm? I"m fairly mechanical but no expert.

Thanks!
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  #2  
Old 10-21-2010, 08:17 PM
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same thing happened to mine, pcm was fried. got mine off ebay for 200 but had it overnighted for 50 bucks.

its so easy to install. just remove 3 bolts. and the 3 wire harness'. passanger side firewall you cant miss it. by the intake filter.
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  #3  
Old 10-21-2010, 08:32 PM
dakota19762 dakota19762 is offline
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I just ordered mine from them, works great. I will tell you to call, I had to wait 3 weeks for mine. They said it was due to a national backorder. That was back in September though.
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Old 10-21-2010, 10:35 PM
Charvet7 Charvet7 is offline
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Default Thanks

Thanks guys, very helpful. I can't believe how much they want to fix the problem, I will get it towed home and wait for pcm arrival.

Will this effect my keyless entry/alarm system? As long as my vin and mileage are correct I don't see how but my research shows some people had security/alarm issues after.
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Old 10-21-2010, 10:59 PM
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i didnt have any issues with keyless entry, but i dont have an alarm.

the dealer wanted over a grand aswell. they sure do rape you for every penny when its not even worth it. i wonder what they wanted for labor to remove 3 screws.
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Old 08-25-2011, 08:42 PM
TheDad TheDad is offline
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Default Where does the oil come from?

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?
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Old 08-25-2011, 08:48 PM
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oil IN the connections to the PCM??? not even possible.
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Old 08-25-2011, 09:10 PM
TheDad TheDad is offline
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Default Yes it is!

Don't know where it is coming from but I've cleaned it out more that once. I thought at first it was some kind of dielectric grease to keep water out, but now I don't know.
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Old 08-25-2011, 09:13 PM
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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.
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Old 08-25-2011, 09:23 PM
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It's possible and common but it's likely not engine oil.

It's probably power steering fluid. The pressure switch can leak and the fluid moves along the wires into the pcm.

Check the pressure switch.
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Old 08-25-2011, 09:27 PM
TheDad TheDad is offline
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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.
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Old 08-25-2011, 09:28 PM
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wow, i need to see pics of this. im still skeptical but wow.
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Old 08-25-2011, 09:31 PM
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Dan, thanks for the idea on the power steering fluid. I'll check it in the am.
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Old 11-29-2011, 01:53 AM
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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?

Quote:
Originally Posted by thunder98110 View Post
oil IN the connections to the PCM??? not even possible.
Picture for the closed minded know it all:

Click the image to open in full size.

Last edited by e-racer; 11-29-2011 at 02:14 AM..
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Old 11-29-2011, 04:28 AM
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98DAKAZ 98DAKAZ is offline
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Default wow thats strange

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.

Check this link out http://en.wikipedia.org/wiki/Transformer_oil
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Old 11-29-2011, 07:10 AM
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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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Old 11-29-2011, 07:10 AM
 
 
 
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