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 October 22, 2025.

 

WEEKLY ISSUES

1. Performance Brake Kit (5JL) Calibration Now Available for 2026 T1XX SUVs

Calibrations are now available for the Accessory Performance Brake Kit (5JL) on 2026 T1XX SUVs (Tahoe, Suburban, Yukon, Escalade).

Contact TCSC to have the necessary changes made for the BSCM. #PIT6441 will be updated with this new information.

 

2. 2025 T1XX LD Trucks Software Reconfiguration Issue

There is an issue with 2025 T1XX LD Trucks BCM software that does not allow TCSC to reconfigure the following accessories or reconfigurations:

• Fast Flash (bulb outage detection) Removal (ZW9)
• Remote Start Add
• Speed Governor Changes (adding or removing)
• Police Vehicle Reconfigurations
• High Idle (UF3)
• Engine Timeout Disable (SK4)

Engineering is working to resolve this issue. There currently is no ETA for a fix. Refer to #PIT6443 for more information.

Note: Tire reconfigurations are still supported for these vehicles.

 

3. 2025 HD Trucks Wireless Keypad Accessory Issue

There is an issue with Wireless Keypad Accessory adds on 2025 HD Trucks where the keypad will fail to learn to the vehicle. The error “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 a fix.

Note: All other T1XX LD/HD keypad issues have been resolved. Before performing the wireless keypad learn, the BCM must be programmed to receive the latest calibrations.

 

4. 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.

 

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. Refer to Bulletin #07-08-42-006 for more information.

 

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).

 

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

 Engineering has found the root cause of this issue, which has been resolved on newer parts. Please verify through EPC that the latest HW PN is being used.

 

8. Speed Governor Calibrations Not Available for 2025+ T1 Trucks (LD/HD) Built with RPO QHY Wheels.

Calibrations have not been released for Speed Governors (9C2, 9B9, 9D7) for 2025+ Trucks (Silverado/Sierra) built with QHY (LT235/80 R18) Wheels.

There is no planned release for these calibrations at this time.

 

9. 2025+ T1XX Trucks and SUVs with 9C1/5W4 – Auto Protected Idle Does Not Require Changes from TCSC

These vehicles are pre-built with the correct calibration for Auto Protected Idle and no changes are required from TCSC.

If the build date of the vehicle is before August 2025, the vehicle will require a BCM update through SPS2 to receive the latest calibrations to accommodate the Auto Protected Idle.

Note: Auto Protected Idle does not add Extended Idle. Extended Idle is already enabled on 2025+ vehicles built with 9C1/5W4.

 

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