Diagnostic Aids

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Check for Preliminary information or Technical Service bulletins before programming.
During programming you may be required to select multiple calibrations dependent upon vehicle equipment. Have the vehicle build/RPO information available during the following procedure to ensure the correct calibrations are selected.
If the control module calibration is only being updated, USB programming may not be required, depending on the current software level, or the release of updates. If USB programming may not be required when replacing/reprogramming the control module. If USB files for the application are not available via SPS, or have not been received from General Motors in another manner, the USB process will not need to be performed unless instructed otherwise in a service document or publication.
Begin with the vehicle in the vehicle OFF power mode. The Service Programming System will power mode the vehicle.
The vehicle can be moved to an alternate location when performing the USB portion of the programming steps which could allow the possibility of working on another vehicle while the USB programming event is taking place.
When transferring a large file (>1GB) from the Techline Connect server to the PC then to a USB stick, below are some useful tips:
- A wired connection to the network is the quickest, most stable way to download the file.
- Wireless connections can be used, however slower connection speeds may increase the likelihood of errors to occur during file download.
- Once the file is downloaded to the PC, it will reside in cashe unless the cashe is cleared. Any additional USB sticks made from that PC will be copied from cashe and take a much shorter time compared to downloading from the server.
- Never take a USB stick directly to a vehicle for updating without starting a Techline Connect session for that particular VIN. If software is already on the stick, Techline Connect will take only seconds to confirm software on the stick is the latest and correct for that vehicle. Failure to perform this step will result in no warranty claim code indicating a USB programming event was completed.