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  #1  
Old 01-19-2014, 04:13 PM
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Not shifting passed second

Well here is the problem, truck has driven just fine up until this morning. From here on out I knew it was going to be a bad day. First the truck didn't start, cranked it for a while with no prevail, probably related to my new injectors and air in the system. Jumped the truck a few min later and it fired right up. Then I was fixing my boost gauge, got it to work so took it out to make sure all was good. Drove down the street, gave it a decent pull to like 45, and from then on out it won't shift passed second. First to second is fine but will rev out in second. Got a good scan gauge on it and gave me a few codes. U1059 trans position information invalid, u1027 missing or invalid engine rpm, u1058 communication bus fault, p0500 speed sensor a, p1876 2wd transfer case selenoid or short to ground, p1832 another transfer case failure.

Now with all that being said, I'm leaning toward electronic or a shift selenoid due to the fact that it just happened, no warning or nothing like a slipping TC or something. Any ideas of the tops of your heads as what it may be. And if it's a PCM can I pull one from a junkyard truck to put in my truck and the chip will override it? Also could I have melted the wiring harness to the trans while cranking? Any help is great, just hoping it's not anything too serious, this is my only vehicle. Thanks for your help.
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  #2  
Old 01-20-2014, 11:36 AM
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Bump..

I have replaced the rear speed sensor and pulled the chip, both are not the culprit. Also I can't get a scanner to communicate with the PCM. Could this be the whole problem, and if so can I get one from a junkyard and the chip will program it to how it should be?
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Old 01-20-2014, 11:48 AM
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The scanner probably isn't communicating because of a blown fuse
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Old 01-20-2014, 11:58 AM
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Quote:
Originally Posted by steve604 View Post
The scanner probably isn't communicating because of a blown fuse
Checked and replaced the PCM keep alive fuse. Which others could it be?
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Old 01-20-2014, 12:01 PM
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It's the one that also does the "power point" outlet on the passenger side of the dash. Had a problem with mine this past summer where the fuse wasn't making contact in the fuse panel. I twisted the 2 prongs of the fuse slightly so it made contact.

If you have power at the power point, the fuse is ok
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Old 01-20-2014, 12:17 PM
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Quote:
Originally Posted by steve604 View Post
It's the one that also does the "power point" outlet on the passenger side of the dash. Had a problem with mine this past summer where the fuse wasn't making contact in the fuse panel. I twisted the 2 prongs of the fuse slightly so it made contact.

If you have power at the power point, the fuse is ok
I have power to the power point.
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Old 01-20-2014, 12:21 PM
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If all your fuses are good amd considering you were able to pull a long list of codes earlier, I'm leaning toward fried PCM but don't hold me to that. Can you borrow one from another truck?
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Old 01-20-2014, 12:22 PM
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Also make sure all of the main harnesses are plugged in properly.
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Old 01-20-2014, 12:39 PM
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Quote:
Originally Posted by steve604 View Post
If all your fuses are good amd considering you were able to pull a long list of codes earlier, I'm leaning toward fried PCM but don't hold me to that. Can you borrow one from another truck?
Not locally. Could possibly pull one from a junkyard but I don't think I know anyone with a 99-03 7.3
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Old 01-20-2014, 02:22 PM
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My dad checked the PCM with a bolt meter and all checked out from what we could find. Idk what is wrong with the PCM but I think stuck valve or solenoid, the OD light flashed today but because we can't access the PCM we can't find it. Either way I am stumped. Definitely need some help on this one.
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