Transmission Whine Sound

Transmission Whine Sound

There may be a whine sound heard under light acceleration or when coasting on some 2023-2024 Colorado and Canyon models equipped with the 8L45 or 8L80 8-speed automatic transmission (RPO […]

March 29, 2024
March Service Newsletter from the Experts at GM TAC

March 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 March GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

March 29, 2024
Vehicle Alignment and Super Cruise

Vehicle Alignment and Super Cruise

After a wheel alignment, the Super Cruise system (RPO UKL) – Lane Active Safety-Keep Assist, Hands-Free Lane Following (Entire Speed Range) (Fig. 9) – may not center the vehicle properly […]

March 29, 2024
Rear Axle Differential Lock Control Actuator Condition

Rear Axle Differential Lock Control Actuator Condition

A Service All Wheel Drive message may be displayed on the Driver Information Center in some 2020-2023 Encore GX and 2021-2023 Trailblazer models equipped with the 1.3L engine (RPO L3T) […]

March 29, 2024
Diesel Exhaust Fluid Supply Pipe Contamination

Diesel Exhaust Fluid Supply Pipe Contamination

Some 2020-2024 Silverado 1500, Silverado 2500HD/3500HD, Sierra 1500, Sierra 2500HD/3500HD; 2021-2024 Tahoe, Suburban, Yukon and Escalade models equipped with the 3.0L diesel engine (RPO LZ0, LM2) or 6.6L diesel engine […]

March 29, 2024
FSE Technician Recognition Awards – 1st Quarter 2024

FSE Technician Recognition Awards – 1st Quarter 2024

The GM Field Service Engineer (FSE) Technician Recognition Awards (U.S.) celebrate the skill and dedication of dealership technicians who have recently worked with FSEs on challenging repairs. Technicians at GM […]

March 21, 2024
Crankshaft Bearing Diagnosis

Crankshaft Bearing Diagnosis

A growling, knocking or rhythmic thumping sound may be heard on some 4.3L engines (RPO LV3), 5.3L engines (RPO L82, L84) and 6.2L engines (RPO L87, LT1, LT2, LT4, L8T) […]

March 21, 2024
Convertible Top Water Leak

Convertible Top Water Leak

Some 2020-2024 Corvette convertible models may have a water leak around the side glass. The leak, which is found at approximately the middle rear of the side glass area (Fig. […]

March 21, 2024
Power Tonneau Cover Tips

Power Tonneau Cover Tips

The GM Accessory Power Tonneau Cover (part number 86575628 or 86595165) is available on 2022-2024 HUMMER EV Pickups. (Fig. 15) If the hard power-retractable tonneau cover is not operating properly, […]

March 21, 2024
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 the “E-Phaser” cam phaser system […]

March 21, 2024
MDI 2 Advanced Setup Technical Tips Update

MDI 2 Advanced Setup Technical Tips Update

With the MDI Manager application software, the MDI 2 can be configured to communicate with a PC using several possible networks, such as a USB cable, ethernet cable, Wireless Local […]

February 20, 2024
Fuel Feed Pipe Buzzing Sound

Fuel Feed Pipe Buzzing Sound

Some 2017-2025 Camaro models equipped with the 6.2L V8 engine (RPO LT4) may have a buzzing, ticking or rattle sound coming from the passenger side of the vehicle. The sound […]

February 20, 2024
February Service Newsletter from the Experts at GM TAC

February 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 February GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

February 20, 2024
Exhaust Resonator Rattle

Exhaust Resonator Rattle

An exhaust rattle may be heard underneath the vehicle on some 2018-2024 Camaro models with the 3.6L engine (RPO LGX). The rattle may be most noticeable when starting the engine […]

February 20, 2024
Heated Steering Wheel Operation During a Remote Start

Heated Steering Wheel Operation During a Remote Start

The 2023 XT5 and XT6 are available with two heated steering wheel options. These include the manual heated steering wheel (RPO UVD) and the automatic heated steering wheel (RPO KI3). […]

February 20, 2024
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 reviews Hands-Free Start operation on EVs. (Fig. 21)   […]

February 20, 2024
2024 Essential Tool Forecast

2024 Essential Tool Forecast

The estimated 2024 GM Essential Tool forecast is now available for all U.S. dealerships. The forecast includes all expected Essential Special Service Tools along with shipment timing for the 2024 […]

February 16, 2024
Headlamps Flashing Due to Low Battery Charge

Headlamps Flashing Due to Low Battery Charge

Some 2024 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks may have an electrical condition where the headlamps flash and/or the windshield wipers pause while wiping. DTC P0606 (Control Module Processor Performance) […]

February 16, 2024
PicoScope Recording for CVTs with Noise Concerns

PicoScope Recording for CVTs with Noise Concerns

Diagnosing a whine sound or other internal noise concern in 2019-2024 Malibu; 2020-2024 Encore GX; and 2021-2024 Trailblazer models equipped with the VT40 Continuously Variable Transmission (CVT) (RPO MRG) may […]

February 16, 2024
Dual Clutch Transmission MCVM PUN Characterization

Dual Clutch Transmission MCVM PUN Characterization

Service Information repair procedures have been updated for repairs to the Dual Clutch Transmission (DCT) (RPO M1L) on 2020-2024 Corvette models. After making repairs to the DCT, including Main Control […]

February 16, 2024