After replacing a module on a GM model equipped with the Vehicle Intelligence Platform (VIP), several possible concerns may occur. These include:
- Serial Data Authentication Configuration fails to complete.
- DTC U1962 (Unable to Authenticate Serial Data Message) is a current code set in any module.
- No start condition.
- Invalid data codes (data still viewable in GDS2).
- Inability to perform theft relearn or remote pairing (VTD Secure Access Locked).
- Unable to perform the control module setup or learn.
- Airbag indicator may illuminate.
- VIN not auto-populating in GDS2.
These conditions may affect 2020-2026 CT4, CT5, Corvette; 2021-2026 Envision, Escalade, Tahoe, Suburban, Yukon; 2022-2026 BrightDrop models, HUMMER models; 2023-2026 LYRIQ, Colorado, Silverado 1500, Sierra 1500; 2024-2025 XT4, Blazer EV, Equinox EV, Acadia; 2024-2026 Corvette E-Ray, Silverado 2500HD/3500HD, Silverado EV, Traverse, Sierra 2500HD/3500HD, Sierra EV; and 2025-2026 Enclave, ESCALADE IQ, Equinox and Terrain.
If the Serial Data Authentication Configuration (SDAC) — a security handshake between vehicle modules — fails and DTC U1962 sets, it will disable several features. (Fig. 6) Failure typically happens when SDAC is not completed properly after programming a replaced module, often due to mismatched security codes.
TIP: SDAC does not run automatically unless “Replace and Program” is selected when needed. If that step is missed or SDAC fails, the procedure must be run manually.
Fig. 6
When SDAC fails, SPS will display an error message. Bulletin #25-NA-192 provides additional information about the possible causes for SDAC failure and recommended actions to take based on the specific failure observed.
The SDAC will run up to 3 times before it fails. If a vehicle will not complete the SDAC, a pop-up box will display with information about what is causing the concern. (Fig. 7)
Fig. 7
In some instances, error code E7010 will appear, and the pop-up box will appear slightly faded in the background. (Fig. 8)
Fig. 8
There are 5 areas in the pop-up box that include the Function, Sub function, System, ECU, Error. Record the information or take a photo of the pop-up box and review the error types for the symptom with the chart in Bulletin #25-NA-192. The chart provides remedies for issues related to programming, communication and the control module.
– Thanks to Matt Bunting
