TCSC Top Issues This Week

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 their latest tips to help technicians when using Techline Connect applications. (Fig. 1) Look for the latest tips 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 the TCSC.

The following information covers current issues and trends facing dealerships as of September 11, 2025.

 

WEEKLY ISSUES

1. 2026 Silverado 1500 and Sierra 1500 Remote Start (BTV), Governors (9C2/9B9/9D7), Bed Delete (ZW9), and Extended Idle Calibrations (SK4) Not Available

Currently, there is a known issue involving 2026 Silverado 1500 and Sierra 1500 light-duty trucks. As of now, TCSC is unable to make any changes for the above RPOs.

The current ETA for the available calibrations is approximately 2 weeks.

 

2. 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 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.

 

3. Bulletin 25-NA-251 – Vehicle-Wide Programming may Result in a Partial or Failed Condition Where a Majority of the Controllers Fail to Program

There is currently a known issue with the SDGM that may cause VWP to fail on a wide array of vehicles.

This is caused by a known memory issue with the SDGM and requires a power cycle of the SDGM to correct. Please see Document ID: 6994285 for full details.

 

4. #PIT6428: 2022 T1XX LD Trucks and T1 SUVs Built with IOR Radio

When attempting to program the Radio (Non-USB) through SPS2, specific to ONLY 2022 Silverado 1500 and Sierra 1500 trucks as well as 2022 Tahoe, Suburban, Yukon and Escalade SUVs, an E-4491/E-4423 error may appear that shows unknown reprogramming error 1 at step 0 as seen below:

• E4491: Reprogramming Error! Check all connections and reset Programming Interface!
• E4423: Unknown reprogramming error 1 at step 0

This is a known issue. If you are receiving this error, please contact TCSC for a VCI to correct this problem. Refer to #PIT6428 for more information.

 

5. 2024+ T1XX Pickup (LD/HD) Wireless Keypad Accessory Kit Learn Failures

There is currently an issue with the Wireless Keypad Accessory kits for 2024 and later model year Silverado 1500, Sierra 1500, Silverado 2500HD/3500HD and Sierra 2500HD/3500HD where the keypad may fail to learn to the vehicle. An error message “Communication Could Not Be Established” and/or “Write Failure” may be seen.

This is a known issue, and engineering is currently researching a solution. There is no ETA for resolution.

 

6. 2025 T1 Truck Manual Regeneration (FPF) Not Yet Available

 Calibrations for Manual Regeneration (FPF) have not yet been released for 2025 Silverado and Sierra trucks. These vehicles are planned to be supported but no ETA is available yet for when the calibrations will be released.

 

7. DTC U3000 Set After One or Both Side Blind Zone Modules Replaced on 2023+ Colorado, Canyon, Corvette, CT4 and Envision

Engineering is tracking down the cause of this concern. Please answer the following questions to the best of your ability and provide them in your DCM case to TCSC for the quickest possible service:

• Do the replacement SBZ module(s) have a green dot/line on the part label?
• Where did you obtain the new service parts from?
• Were these parts ordered? If so, from where?
• Is there currently a SPAC case set up for this issue?
• Were these parts obtained from another dealer?

 

COMMON ISSUES

1. 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.

 

2. TLC Restricted Access

The following message may be seen when attempting to access Techline Connect. (Fig. 2)

Fig. 2

 

The message indicates the current ID is blocked from accessing Global Connect. This can be for a multitude of reasons but typically is due to a counterfeit MDI device.

To unblock the account, reach out to TCSC via Dealer Case Management (DCM) with the following information:

• User ID in Global Connect
• Email of User
• First and Last Name of User
• BAC/Dealer Code and Name of Dealership

TCSC will be able to reach out to the Cybersecurity team that will be able to determine the cause of the block and may be able to unblock the account. In the case of a counterfeit MDI, the counterfeit tool must be destroyed, and a legitimate Bosch device must be used to ensure the ID is not blocked again. Repeat offenders may not be unblocked from access.

 

3. E-9111/E-9113 TCM/MCVM Operation Errors

An E-9111 or E-9113 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 correctly, and that the TUN/PUN is in capital letters. Double check that the number zero (0) is not a letter “O” and that there are not any typos or extra characters.

If the TUN/PUN is correct, open a DCM 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.

 

4. T1XX Trucks 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.

Similarly, 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.

Additionally, for the ECM, use the “Calibration Part Number 1” (also may be called “Software Module Part Number 1”) found in GDS2 under Identification Information.

 

5. 2024-2025 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD Adding ZW9 (Bed Delete) Built with UV2 (HD Surround Vision Camera)

Engineering has confirmed that there are not any compatible calibrations that support both RPO ZW9 (Bed Delete) and RPO UV2 (HD Surround Vision Camera).

Please be advised that ZW9 cannot be added to vehicles with UV2 regardless of trim level.

 

6. Downsizing of Tires is NOT Supported on T1 Full-Size Trucks and SUVs

Please be advised that downsizing tires of any kind is not supported on any T1 series vehicle from 2021 – Current. This includes full-size trucks (Silverado, Sierra) as well as SUVs (Tahoe, Suburban, Yukon, Escalade.

 

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