TCSC Top Issues This Week

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 […]

May 14, 2025
Diagnostic Tips for Audio and Display Screen Concerns on IOK Radios

Diagnostic Tips for Audio and Display Screen Concerns on IOK Radios

There may be several display screen concerns and other conditions on the infotainment system (RPO IOK) of some 2022-2025 Silverado, Tahoe, Suburban, Sierra, Yukon, HUMMER EV; 2024-2025 Corvette, Silverado HD […]

May 13, 2025
Required Information for Restricted IOK Radios

Required Information for Restricted IOK Radios

The infotainment system (RPO IOK) on 2022-2025 Silverado, Tahoe, Suburban, Sierra, Yukon, HUMMER EV; 2024-2025 Corvette, Silverado HD and Sierra HD models is on restriction. (Fig. 3) If the radio […]

May 13, 2025
Power Doors OTA Update Released for 2025 Escalade

Power Doors OTA Update Released for 2025 Escalade

2025 Escalade, Escalade ESV and Escalade V-Series models built early in the model year offered a power-assist exterior door system (RPO APD with R6W) that has power-assisted door opening and […]

May 13, 2025
QR Code Scanning Helps Avoid Input Mistakes When Programming Modules

QR Code Scanning Helps Avoid Input Mistakes When Programming Modules

When replacing a valve body or transmission on a GM vehicle, it is essential to gather Mechanical Characterization & Virtual Matching (MCVM) data from the cloud. Due to manufacturing variations, […]

May 13, 2025
GM Service Know-How Emerging Issues

GM Service Know-How Emerging Issues

The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar previews the 2025 Corvette ZR1. (Fig. 12)   Fig. […]

May 13, 2025
New TAC Response Requested Process

New TAC Response Requested Process

A new GM Technical Assistance Center (TAC) process is being implemented to ensure the customer is being considered when TAC is working in partnership with dealership technicians to repair customers’ […]

May 9, 2025
Keep Your Cool — Air Conditioning Refrigerant Leak Diagnostic Tips

Keep Your Cool — Air Conditioning Refrigerant Leak Diagnostic Tips

All current GM vehicles are manufactured with fluorescent dye installed in the air conditioning refrigerant system. The dye mixes and flows with the A/C compressor oil to help in locating […]

April 30, 2025
Water Leak at the A-Pillar Body Plug

Water Leak at the A-Pillar Body Plug

There may be several inoperative electrical features on some 2019-2025 Blazers. (Fig. 4) These conditions may include inoperative door chimes and door lamps, inoperative power mirrors or a distorted driver-side […]

April 30, 2025
Unlatching the Front Compartment Hood with a Weak 12V Battery

Unlatching the Front Compartment Hood with a Weak 12V Battery

The front compartment hood on some 2024-2025 Corvette models may not fully unlatch when one of the hood release buttons is pressed if the 12V battery is weak, resulting in […]

April 30, 2025
Differences in Approach Lighting on Mid-Size SUVs

Differences in Approach Lighting on Mid-Size SUVs

The approach lighting on the 2024-2025 Traverse and Acadia has several differences compared to the lighting elements on the 2025 Enclave. It’s important to understand these differences when diagnosing any […]

April 30, 2025
April Service Newsletter from the Experts at GM TAC

April Service Newsletter from the Experts at GM TAC

The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the April GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

April 30, 2025
Outside Rearview Mirror Glass Removal

Outside Rearview Mirror Glass Removal

There are several GM Accessories available that update the design and functionality of the outside rearview mirrors on 2022-2025 HUMMER EV models. (Fig. 1) GM Accessories range from different housing […]

April 10, 2025
Executive Second-Row Seat Operation

Executive Second-Row Seat Operation

The available Executive Second-Row Seats (RPO ABV, AL4) in the 2025 ESCALADE IQ (Fig. 5) feature power operation for second-row passengers, which makes it easy to adjust the seats for […]

April 10, 2025
Super Cruise Disengages or is Unavailable

Super Cruise Disengages or is Unavailable

The Super Cruise driver assistance technology may disengage or be unavailable on some 2021-2025 Escalade; 2023-2025 LYRIQ; 2024-2025 Traverse, Acadia; 2025 Enclave, CT5, ESCALADE IQ, OPTIQ, Blazer EV, Equinox EV, […]

April 10, 2025
2025 Cadillac VISTIQ TAC Action Center

2025 Cadillac VISTIQ TAC Action Center

The GM Technical Assistance Center (TAC) has established a TAC Action Center for U.S. dealerships to provide product feedback on the all-new 2026 Cadillac VISTIQ. (Fig. 14)   Fig. 14 […]

April 10, 2025
GM Service Know-How Emerging Issues

GM Service Know-How Emerging Issues

The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar takes a look at trailer lighting and braking operation. […]

April 10, 2025
Dealer Case Management Tips for TCSC Submissions

Dealer Case Management Tips for TCSC Submissions

Technicians can use Dealer Case Management (DCM) to create, view and update Techline cases in real time with the Techline Customer Support Center (TCSC), reducing the time spent waiting on […]

March 31, 2025
EVAP System on the New 1.2L Engine Requires Updated Leak Test Diagnostics

EVAP System on the New 1.2L Engine Requires Updated Leak Test Diagnostics

The 2025 Envista, Encore GX, Trax and Trailblazer are available with the new 1.2L engine (RPO LBP). The engine configuration features E85 compatibility, which required an update to the Evaporative […]

March 31, 2025
NACS Charging Adapters Designed for Public DC Chargers Only

NACS Charging Adapters Designed for Public DC Chargers Only

The North American Charging Standard (NACS) DC adapters (Tesla Supercharger adapters) (Fig. 11) that are available from GM are for use on public DC Fast Charging stations only.   Fig. […]

March 31, 2025
New Feedback Process on Shipping Parts to the Warranty Parts Center

New Feedback Process on Shipping Parts to the Warranty Parts Center

The GM Warranty Parts Center (WPC) requests the return of specific parts replaced at dealerships through the Global Warranty Management (GWM) system to better understand and help resolve product issues […]

March 31, 2025