engine code p1781 - Diesel Bombers



Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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Old 11-05-2010, 10:31 AM
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Default engine code p1781

First time posting, Dr. Evil said to find the correct post, and post there, hope this is it.

I have a 2001 silverado 2500hd engine code p1781 poor or lost communication to TCM
( transmission control module ??) Found TSB 01-06-04-020 for this code but could not find information on how to correct this.
Can anyone help me with this?
Sure hate to take it to the dealer ( ouch!! )
Thanks in advance for any help.

mcanfield
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Old 11-05-2010, 01:34 PM
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Have you checked the connections both at the TCM and the back of the transmission?
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Old 11-05-2010, 02:46 PM
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Thanks for the reply.
With your knowledge of this, can you tell me what and where is the TCM. I believe I can find the connection at the back of the tranny ( I hope )
Do I assume you are from Wisconsin? I recently moved from south eastern Wisconsin to here in south western Kentucky, yup! Kentucky, we love it here, great weather and much much lower taxes.
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Old 11-09-2010, 07:31 PM
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The TCM is Transmission Control Module. I see you put another post up.
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Old 11-12-2010, 08:51 PM
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Thanks to all that helped with this, I found with more research that a low battery condition can cause erratic codes. This is what the problem was all along. After finding about the low battery condition , believe or not, the next day I went to start my truck and it would barely turn over. I put it on my charger and got it to start, went to Auto zone for their free battery check, found one battery completely dead the other only 70%.
Changed both batteries with 1000 cranking amps. the code went away and has not returned so far.
Thanks again
mcanfield
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