The Techline Customer Support Center (TCSC) is available to help dealerships with diagnostic and programming issues related to Techline Connect (TLC) and the Service Programming System (SPS).
TCSC has now released its latest tips to help technicians when using Techline Connect applications. (Fig. 1) Look for the latest information on TechLink each week.
Fig. 1
To get the most out of Techline Connect, be sure to review the following items before making a call to TCSC.
The following information covers current issues and trends facing dealerships as of June 11, 2026.
WEEKLY ISSUES
1. NEW – OnStar Next Button Disappearing after Delta Programming
Pre-programming instructions for OnStar may indicate to run Delta programming multiple times until SPS2 indicates a same-calibration block. However, users are seeing that the Next button disappears after Delta programming instead of providing a same-calibration block message as indicated. As a result, it’s not possible to proceed with further programming.
The missing Next button indicates that the OnStar Delta programming is up to date and the next programming steps can be attempted. (Fig. 2)
Fig. 2
2. MDI/Scan Tool Disconnecting in SPS2, Showing Status: Disconnected in TLC
Users may see the MDI/scan tool disconnect/reconnect rapidly in SPS2, causing issues with connectivity. GM is aware of this issue and is actively investigating.
To potentially resolve this issue, disconnect the scan tool, reboot the tool, and then reconnect.
3. EPC Showing Incorrect Radio Hardware for 2025 Blazer EV
Users report that the Electronic Parts Catalog (EPC) is directing to an incompatible part for the 2025 Blazer EV.
- PN 85852385 is not compatible with the 2025 Blazer EV. Please order PN 85791702 instead.
GM is working on correcting the EPC to show the correct hardware.
Note: If you are unable to place an order for PN 85791702, please reach out to the Service Parts Assistance Center (SPAC).
4. 2021 Tahoe, Suburban, Yukon, Escalade, Corvette, Envision, CT4, CT5 Unable to Complete SDAC (Serial Authentication Data Configuration) #PIT6507
There is currently a known issue affecting some 2021 vehicles where the SDAC may fail. The radio, IPC, or Telematics (OnStar) modules may be the cause of these failures.
DO NOT REPLACE THE MODULE. This is a known SPS issue and the current workaround is to disconnect the SDGM X3 connector and re-attempt SDAC. Refer to #PIT6507 for more information, including affected vehicles.
Engineering is aware of this concern and working on a permanent resolution.
5. 9G8 (DRL/AHL Disable), SK4 (Engine Idle Timeout), UTQ (Content Theft), BCN (Retail Locking) and 6N6 (Rear Window Disable) Not Yet Available on 2026 Vehicles
Calibrations for RPOs 9G8, SK4, UTQ, BCN and 6N6 are not yet available for model year 2026 vehicles but are planned to be released. However, there is not currently an ETA.
Note: RPO SK4 calibrations are now available for T1 Trucks (Silverado, Sierra). T1 SUV (Tahoe, Suburban, Yukon, Escalade) is still being worked on.
COMMON ISSUES AND HELPFUL INFORMATION
1. NEW – 2000-2010 Saturn (Any Model) or Pontiac Solstice Experiencing Issues in Techline Connect
There is currently a known issue with nearly all model year Saturn vehicles and the Pontiac Solstice where various issues may occur in Techline Connect, including E-6223, E-4399 on PCM/BCM, vehicle stuck in Park after programming ECM/TCM modules, or the vehicle thinking it is Manual when it is Automatic. Please reach out to TCSC with any programming issues.
2. 2019-2021 Trax IPC Programming Issue
GM is aware of an issue affecting 2019-2021 Trax models where a replacement IPC may fail with E-4491 and line/op/error indicate (X, B0, 85).
This issue is currently being investigated by Engineering. Please reach out to TCSC if you are experiencing this issue.
3. ECM/Radio/IPC Part Missing from SPS2 Part Dropdown
When performing IPC Graphics programming, Radio USB, or ECM programming, you may be prompted in SPS2 to select “Service Hardware.” However, this is misleading.
- For IPC Graphics programming, use the “Boot Software Part Number 1” found in GDS2 under Identification Information.
- For the Radio USB Programming, use the “Calibration Part Number 1” (also may be called “Application Part Number 1”) found in GDS2 under Identification Information.
- For the ECM, use the “Calibration Part Number 1” (also may be called “Software Module Part Number 1”) found in GDS2 under Identification Information.
4. 2015+ Chevrolet Express SOSM E-4399 Issue and ECM VIN Write Issue
GM is aware of a known issue where programming current/replacement SOSM modules (Left/Right) will cause an E-4399 in SPS2, despite the modules having communication.
Additionally, the VIN may not write on a replacement ECM successful programming events.
Please reach out to TCSC for a VCI to correct either concern.
5. Bulletin #24-NA-098: SPS Best Practices and Programming Error Troubleshooting
Document ID: 6662319 has been published to assist with common programming errors, descriptions and recommended helpful/general troubleshooting for SPS errors. Please refer to this page if you encounter a programming error within SPS2/TLC.
6. E-9111 or E-9113/E-9114 TCM/MCVM Operation Errors
An E-9111 or E-9113/E-9114 error may occur when programming the TCM, or after replacing the transmission assembly/valve body, and entering the TUN/PUN under MCVM Operations in SPS2.
The error is caused by a mismatch in data between the vehicle’s TUN/PUN and the TUN/PUN uploaded in the GM database. Please ensure:
- The complete TUN/PUN number is entered.
- The TUN/PUN is in capital letters.
- The number zero (0) is not a letter “O”.
- There are not any typos, extra characters, or spaces.
If the TUN/PUN is correct, open a case with TCSC and attach a clear picture of the replacement TUN/PUN in the case, as TCSC will require these to work with Engineering and have the issue addressed.
If you are receiving these errors via programming and the TUN/PUN was not replaced, TCSC may still require the TUN number.
7. Front View Camera Programming or Camera Learn Issues Specific to 2024 Colorado and Canyon (ZR2)
There is currently a known issue with the Front View Camera involving ONLY 2024 Colorado/Canyon built with ZR2 and UHY, and without UWI, UKW, or ULV.
The Front View Camera may fail to program or set loss of communication codes such as DTC U0265. The camera learn also may fail in GDS2 with various errors.
A VCI is required to correct this problem. Please reach out to TCSC for this fix.
How to Contact TCSC
- U.S. ONLY: Assistance can be provided by using the CX Connect portal on Global Connect. If additional support is needed once the CX Connect case is created, contact TCSC at 1-800-828-6860. For U.S. only, a case is required for phone support.
- Canada: Contact TCSC at 1-800-828-6860 (English) or 1-800-503-3222 (French).
- All other regions: Contact your regional Technical Assistance team for Global Techline Support.
– Thanks to the Techline team
SPS looks at a series of sub-calibrations that aren’t displayed to the user so it’s a bit confusing. We’ll pass on this feedback to the team responsible.
Sometimes when programming virtual cockpit radios, I noticed after completing prepare for usb file transfer and move on to usb transfer, the calibration IDs are not even close to each other however it says you’re attempting to use the same calibrations. After that the radio status is up to date in sps3.
USB programming is currently turned off for MY25 Blazer EV VCU IVE. Refer to #PIC6641.
When using sps2 to program radio on 2025 blazer ev, usb programming is missing from programming options. Prepare for delta programming, usb file download status, programming part 1, programming part 2 and setup are the only options listed. Another tech is seeing the same thing with a different blazer ev, so I know it’s not a vehicle issue. Is this something that engineering is aware of?
Developers have identified the issue and a fix is expected to be coming shortly.
Unable to print from vehicle wide programming status check since beginning of last week (5/11). Once programming is completed, the same print button prints fine. Also, unable to print or export from the SPS Settings Warranty Claim Code tab (actually never have been able to print from this tab).
I ALSO CAN NOT PRINT THE FIRST VWP SOFTWARE STATUS CHECK AND ALSO THE FINAL SCRENN USING THE PRINT BUTTON IN SPS2, THIS STARTED THE MIDDLE OF WEEK MAY 4-8
Having the same problem, unable to print. Also when will the error message “VWPDS101: VEHICLE NOT SUPPORTED” Be corrected. Comes and goes, ran vehicle wide programming for an hour and then the message came up. On going problem for a long time, not just me, many other techs I know across the region
on 5-11-26 unable to print final vwp i just shut down lap top and will see if that correct this issue
justy seeing if im the only one
If you’re being prompted for a password, it’s likely you haven’t been granted the proper administrative rights on your PC. Contact your local IT to obtain admin rights and then create a CXOne case and contact TCSC if you need support uninstalling and reinstalling the MDI Manager software and restoring your MDI 2s.
does anyone know how to fix all of our pc’s and mdis after the last mdi update? they no longer work wireless and they are asking for a password.
A Techline representative will be contacting you to gather more information about the connection issue.
been having tlc problems connecting to car post update. was told by engineering it was because of windows 10 so i picked up a windows 11 computer and same thing. it has been happing to other guys in the area too. as soon as it open and click the connect button nothing happens ….. ever…. just cars backing p and frustration is rising. please provide an update to fix this. thanks
2025 TRAVERSE LK0 LEAKING INJECTOR….NO UPDATES
PUN ON PARK LOCK ACTUATOR IS 21 DIGITS ON ORIGINAL ACTUATOR AND REPLACEMENT ONE BOTH PUNS MATCHED PAPER WORK BUT ARE ONE DIGIT SHORT PROVIDED PICTURES OF ACTUATORS AND ATTEMPTED TO PROGRAM CODES OF THE ORIGINAL AND REPLACEMENT NEITHER WENT THROUGH CONTACTED SUPPLIER, THEY SENT PUN THE PUN THEY SENT WAS COMPLETELY DIFFERNT THEN ONE ON PART AND PAPER WORK PROGRAMMING DID GO THROUGH.
The Techline Connect team is working on eliminating this error. A Global Connect message will be published once it’s resolved. You should be able to attempt the programming event again (may take several attempts) to get past the error.
keep getting the vehicle is not supported on 23 and later Cadillac EV’s. this is especially annoying as I just finished programing and need a VPBZ warranty claim code. This is very annoying
Please contact TCSC. There are several reasons other than a counterfeit MDI that could cause issues. TCSC would need to further investigate.
Regarding the issue of the website showing ‘current ID is blocked’ when trying to access Techline Connect, the device being used is a genuine MDI2. After programming the vehicle’s engine module, when selecting a new VIN to enter the SPS programming interface, it shows that there is no available server data. Closing the TLC website and logging in again prompts that the ID is blocked. This situation has left me feeling utterly confused.
The GDS2 team has corrected this issue and it will be updated in the next release. You can create a CX Connect case and contact TCSC for a temporary fix until the update is published to production on Monday, Nov. 17.
How about GDS2 stating 2023or so up 1500’s don’t have a TCM when trying to get into it for anything. Ever since a week or so ago????????
We were not able to find a Techline case for your concern. TCSC will reach out as soon as possible to assist you.
Getting message on techline after abour an hour of vehicle wide programming, progress screen will stop and displays msg VWPDS101: VEHICLE NOT SUPPORTED YET FOR VEHICLE WIDE PROGRAMMING, This on a ’24 Lyriq, I do these every day. Contacted techline, no info.
This issue should be fixed with an update this weekend (11/8/25). If you’re still experiencing the issue on Monday, it’s recommended to start a case with TCSC.
why does TLC still freeze when trying to do a vehicle wide DTC check? seems the newer the vehicle, the greater the % it will not load.
The issue was corrected at 2 pm EST on 10/28/25. If Techline is not working, clear your browser cache and then reboot your PC. If you are still experiencing issues, please contact the TCSC.
Techline has been down since 10/27, is there any update on when it will be restored. Cannot even use gds standalone.
Technicians will be given credit for any test questions involving bulletins removed from SI.
There’s a question in the q4 MOE test for bulletin # 25-na-251, how do we answer it if it has been removed?
Bulletin #25-NA-251 has been removed from Service Information. The article has been updated. More information to come.
Bulletin #25-NA-251 – Vehicle Wide Programming (VWP) May Result in a Partial or Failed Condition Where a Majority of the Controllers Fail to Program doc id 6994285 cannot be found in si, how do we find it?
1. RESOLVED. 2026 Silverado 1500 and Sierra 1500 Remote Start (BTV), Governors (9C2/9B9/9D7), Bed Delete (ZW9), and Extended Idle Calibrations (SK4) Now Available
This issue has been resolved. Contact TCSC to have the changes completed.
2025 T1 Truck and SUV Extended Idle (SK4) Not Yet Available
Does anyone Know if this Calibration has come out yet?
To use the higher priority connection as a default:
1. Go to Control Panel > Network and Sharing > Change Adapter Settings.
2. Right-click the desired connection (Higher Priority Connection-PC Wireless card or LAN card).
3. Click Properties > Internet Protocol Version 4
4. Click Properties > Advanced
5. Uncheck ‘Automatic Metric’
6. Enter 10 in ‘Interface Metric’
7. Click OK. Repeat for the Lower Priority Connection (MDI 2), but this time put 20 into the ‘Interface Metric’
Contact TCSC if help with this set up is needed.
Currently when I try to perform vehicle wide update it shows “NVS102: VCS DLL could not be loaded”. Has anyone seen this error message? Currently using laptop with wired usb.
The truck calibrations are now available. The SUV calibrations are expected to be available in August.
2. 2025 T1 Truck and SUV Extended Idle (SK4) Not Yet Available
Does anyone Know if this Calibration has come out yet?
A Techline representative will reach out to assist with your issue.
Has there been any recent GDS2 problems from recent updates where Vehicle Wide DTC scan will not load the list of codes? It gets to the screen which tells you which modules have DTCs and how many DTC’s in each module, but clicking View Details results in and endless loading graphic. It makes it very time consuming to view and clear DTCs in multiple modules. Thank you for any information you can provide.
MAY NEWSLETTER DISCUSSED #20-NA-203: Information on Manual Regeneration Displayed on Drivers Information Center (DIC) – (Jul 17, 2024). More information should be shared on this. Is it emergency vehicles only? I haven’t seen this on passenger vehicles. This newsletter discussing Manual regeneration calibrations- Haven’t seen this option on passenger vehicles either.
appreciate this information, it helps us identify problems. save us time and aggravation. please continue this information in the future. it is a very good resource for potential programming concerns