NASTF Information Requests

Tracking: 693 Status: Closed
State: CA Name: Michelle
Category of Request: Reprogramming Manufacturer: 2005 PONTIAC GRAND AM

Have you checked the OEM website?
Description of Repair unable to perform
Communication is no longer available with vehicle PCM after calibration reprogram attempt. Prior to this attempt the vehicle was performing without any problems. Approx. 10 seconds after calibration reprogramming started, reprogramming failure codes (E4491 and E4423) appeared. Communication with PCM was lost and the next attempt at reprogramming prompted a "severe error" code (E4399). Communication has not been re-established with the PCM. Communication is still available to other modules (BCM, IPC, etc.)
Description of Information not available
How to re-establish communication with PCM, if possible.
Description of steps taken to obtain information (help/contact function on website, websites, etc.)
All precautions on the initial reprogramming attempt on this vehicle were taken (proper PC and specifications, battery stabilization, no wireless connections, etc.). Manufacturer tool and protocols were used. After E4399 severe error code was present and communication with PCM was no longer available, I called ACDelco programming support who provided me information on documents that address programming issues with 2005-2006 Grand Prix vehicles, as well as general programming issues on GM vehicles. I followed the instructions in these documents to remedy the no communication problem but the problem remains. Subsequent attempts to get technical help beyond this have proved unsuccessful. I have e-mailed (6 days ago) with no response. I have been promised return phone calls from acdelco programming support with more information but have not received them (I have followed up several times in the past week).
Other Comments or Concerns
Based on the documents published by GM on programming issues with this make/model of vehicle I feel GM should provide technical support (not fee-based) on how to either re-establish communication with the PCM or whether or not the PCM is even salvageable. There was nothing to be done to prevent this no-communication problem from happening prior to the calibration reprogramming attempt (no TSB from GM, only internal info available for GM service information customers). The issue is that the information available is reactive, meaning that you only know there are potential problems programming this type of vehicle AFTER the attempt to reprogram. In light of this I am asking GM to provide me with technical support (not fee-based) and how to prevent problems like this (for us all) in the future.
Paul Soar - 11/07/2015
These error codes were set because of lost communication between the PC and the PCM during the file transfer process. This could be due to using the MDI on a vehicle (2005 MY in this case) that operates on Class 2 communication for module reprogramming. It is possible that the file transfer rate of the MDI may be too fast. This error could also occur when programming with the MDI with a wireless connection. The TECH 2 is the recommended tool for this vehicle. Also, GM recommends following PIC3190D and isolate the circuits by installing the jumper wires to the correct terminals prior to any programming. Following this bulletin will eliminate other modules from transmitting a Class 2 message that can interrupt the programming of the PCM. Additionally, there is voluntary emission recall involving certain 2005/2006 MY vehicles regarding PCMs that may have been manufactured with damaged internal IC chips. Refer to the bulletin for the specific models and PCMs. Before replacing the PCM, a technician can try to disconnect the battery cables for a short period of time. If the PCM does not regain communication, the module may have to be replaced. In this particular case, this PCM did require replacement.