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.