Diesel Bombers SIGN UP NOW

National Association of Diesel Motorsports
Go Back   Diesel Bombers > Chevy/GMC Duramax > Chevy/GMC Duramax 01-04 LB7
Sign in using an external account
Register Forgot Password?
Search


Registered Members don't see these ads. Register now it's free!

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

Welcome to Diesel Bombers Forums!
Welcome to DieselBombers .com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Diesel Bombers Forums community today!


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 ... JOIN NOW TO REMOVE TRACER

Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread
  #1  
Old 11-05-2010, 10:31 AM
mcanfield's Avatar
Diesel Fan
Status: Not a Virgin

   

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
Reply With Quote
  #2  
Old 11-05-2010, 01:34 PM
Diesel Bombers Sponsor-Jags Diesel

   

Default

Have you checked the connections both at the TCM and the back of the transmission?

WisconsinHick1's Sig:
2002 Crew Cab Duramax
Nothing special 545hp 1161ft tq

JAG'S PRO TRUCK SHOP DIESEL PERFORMANCE AND REPAIR SPECIALISTS!!
Call us today @ 612-961-3187 or visit our website: http://www.jagsprotruckshop.com/
Reply With Quote
  #3  
Old 11-05-2010, 02:46 PM
mcanfield's Avatar
Diesel Fan
Status: Not a Virgin

   

Default

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.
Reply With Quote
  #4  
Old 11-09-2010, 07:31 PM
Diesel Bombers Sponsor-Jags Diesel

   

Default

The TCM is Transmission Control Module. I see you put another post up.
Reply With Quote
  #5  
Old 11-12-2010, 08:51 PM
mcanfield's Avatar
Diesel Fan
Status: Not a Virgin

   

Default

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
Reply With Quote
 
 
 
submit to reddit
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


 
All times are GMT -5. The time now is 11:43 AM.

Copyright And Legal Notice Links Of Interest

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Diesel Bombers ® - All Content Protected Under Intellectual Property Rights Law of Registered Trademarks
Reg. No. 3,494,401 Cls. 100, 101 & 104 Under Int. Cl. 38
USE AT YOUR OWN RISK WE HOLD NO LIABILITY FOR ANY CONTENT RIGHT, WRONG OR INDIFFERENT

Protected by Copyscape Duplicate Content Check