In an effort to decrease the number of unneeded programming events, reduce the risk of programming-induced faults, and support timely vehicle repairs, the Service Programming System (SPS) has been updated recently to prohibit or warn users against programming a control module with the same calibration that is already present in the control module. This SPS change prohibiting reprogramming using the same calibration applies to all 2017-2018 Buick, Cadillac, Chevrolet and GMC models.
On 2017 and newer models, reprogramming a control module with the same calibration that is already in the control module will be prohibited by SPS. Users who attempt to reprogram a control module with its current calibration will receive the warning message “You are attempting to reprogram with the same calibration. This is not allowed for the selected ECU.” (Fig. 1) Selecting OK will end the programming event.
Warning on Same Calibration
On 2016 and older models, programming a control module with its current calibration is not prohibited, but is not a recommended service procedure. Users who attempt to reprogram a control module with the same calibration will receive a warning message. (Fig. 2)
Selecting Cancel will stop the programming event. If OK is selected, a second warning will appear. (Fig. 3)
Reprogramming with the same calibration is not recommended, but selecting OK again on the second warning message will allow the programming event to proceed.
These warning messages do not indicate an issue with the control module in question and that it should be replaced, only that the control module already has the calibration being programmed. Follow the diagnostic procedure in the appropriate Service Information to determine the root cause.
– Thanks to Andrew McKittrick