NASTF Information Requests

Tracking: 300 Status: Closed
State: CA Name: Chad
Category of Request: Reprogramming Manufacturer: 2007 GMC C5500

Have you checked the OEM website?
Description of Repair unable to perform
Attempted to program a new TCM for an Allison Transmission. All programing guidelines were followed per GM. After TCM was programed Tech2 no longer recongnized TCM, nor did any other modules. Fault Code U0101-No communication with TCM.
Description of Information not available
Did not know that TCM was only able to be programed via an Allison dealer.
Description of steps taken to obtain information (help/contact function on website, websites, etc.)
Tech 2 was used for procedure. Along with GM Esi and SPS. Warranty code for the download is 18F70. Operating system cal #16002724. Transmission Cal#15819969. TCM was purchased through an Authorized GM dealer. Contacted help line 1-888-212-8959. Help line informed us that only Allison dealer was able to perform TCM programing.
Other Comments or Concerns
Why was information and cal files available for us to perform this procedure when we wer'nt supposed to? Why is this TCM flashing ability any different on a 5500 vs a 2500? We are now out a new TCM that cannot be used for anything else.
Mary Hutchinson - 5/4/2010
GM Representative states that he has been in contact with Mr. Perry and assisted him with his issue and the truck in question is back on the road. He also says the following: I have contacted Chad Perry concerning the Service Information Request. The issue in this request is for a GMC 5500 which has a minium GVW of 15,000 lbs therefore falls outside the current light duty regulation. The transmission in this truck is an Allison A1000 and all service and warranty support is through Allison directly and not General Motors. The hardware for programming an Allison A1000 is currently available to anyone who wants to purchase it through SPX or any of the tool suppliers listed in the following website: The current issue is that the programming information is only available to authorized Allison dealers.