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Flashing OD light, Code PO781

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Old Jan 19, 2010 | 04:27 PM
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Flashing OD light, Code PO781

Hello, guys, I'm new to the forum. I have a 2000 Expedition that had the flashing OD light. It is throwing a po781 code(1-2 shift error) from the transmission. Shifting seems to be fine 1-2-3-OD but seems a little rough/stronger. No slipping. Can anyone give me any info or if they had this problem also?

I had the GEM, mystery blower turn-on issue a month ago after a big snow, but has since gone away. Flashing OD light started a week ago.

Any information on possible causes would be greatly appreciated. Thanks!
 
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Old Jan 19, 2010 | 04:41 PM
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It's an indication of an internal tranny problem. I would get it into the tranny shop as soon as possible.
 
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Old Jan 19, 2010 | 05:46 PM
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Thanks alloro, I am going to get it to a transmission shop for detailed diagnostic.

Any way the problem could be related to a GEM module faulty condition...
 
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Old Jan 19, 2010 | 08:01 PM
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Originally Posted by billoffley
Any way the problem could be related to a GEM module faulty condition...
Not likely. It's more apt to be the torque converter issue, a shift solenoid, or a servo inside the tranny.
 
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