HVAC Temperature Actuator Operation at Low Temperatures

HVAC Temperature Actuator Operation at Low Temperatures

The Check Engine MIL may be illuminated on some 2020-2021 CT4 models equipped with the 2.0L engine (RPO LSY) or 2.7L engine (RPO L3B) and some 2020-2021 CT5 models equipped […]

October 30, 2021
CSMT Mobile App Update and Job Aids

CSMT Mobile App Update and Job Aids

New resources are now available to U.S. dealerships for help with submitting or reworking warranty approval requests using the Pre-Repair Authorization (PRA) application (Fig. 13) in the Certified Service Mobile […]

October 30, 2021
Service Leveling System Message Due to Aftermarket Modifications

Service Leveling System Message Due to Aftermarket Modifications

A Service Leveling System message or Speed Limited message on the Driver Information Center (DIC) on some 2021 Tahoe, Suburban, Yukon and Escalade models may be due to aftermarket modifications. […]

October 30, 2021
Dipstick Tube O-Ring Oil Leak

Dipstick Tube O-Ring Oil Leak

When diagnosing engine oil leaks on 2019-2022 Silverado, Sierra; and 2020-2022 CT4-V models equipped with the 2.7: turbocharged 4-cylinder engine (RPO L3B) (Fig. 22), inspect the dipstick tube (indicator tube) […]

October 30, 2021
Latest GM Global Electronic Parts Catalog Release Identifies Single Use Parts, Adds Links to SI and Labor Codes

Latest GM Global Electronic Parts Catalog Release Identifies Single Use Parts, Adds Links to SI and Labor Codes

The latest update to the GM Global Electronic Parts Catalog (EPC) features additional identifiers for single use parts along with a number of links to related Service Information procedures and […]

October 15, 2021
Inspecting High Voltage Insulation Gloves

Inspecting High Voltage Insulation Gloves

When working on any high voltage system on a GM vehicle, certified and tested high voltage insulation gloves must be worn. (Fig. 9) Certified and up-to-date Class “0” insulation gloves […]

October 15, 2021
Warning Lamps Illuminate During Vehicle Turns

Warning Lamps Illuminate During Vehicle Turns

Some 2020 Trax models may have airbag, theft (security) and tire pressure warning lamps that turn on/off along with an illuminated Check Engine lamp during vehicle turns. DTCs U0078 (Control […]

October 15, 2021
Squeak Sound When Turning Steering Wheel

Squeak Sound When Turning Steering Wheel

A squeak sound may be heard from the steering system when making turns in either direction on some 2017-2022 Bolt EV and 2022 Bolt EUV models. The sound may be […]

October 15, 2021
FSE Technician Recognition Awards – 3rd Quarter 2021

FSE Technician Recognition Awards – 3rd Quarter 2021

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

October 15, 2021
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. The latest service topics from GM Brand Quality and Engineering covered in […]

October 15, 2021
Updated 9T65 Transmission Diagnosis Guidelines – Tips from the Replacement Pilot Program

Updated 9T65 Transmission Diagnosis Guidelines – Tips from the Replacement Pilot Program

The 9T65 9-speed automatic transmission (RPO M3V, M3W) replacement pilot program (U.S.) for the 2018-2022 Enclave, Traverse; 2019-2022 Blazer; and 2020-2022 Acadia, XT5, and XT6 models concluded on September 30, […]

September 30, 2021
Program Radio Updates Following the Bulletin Procedures

Program Radio Updates Following the Bulletin Procedures

When completing the programming procedures for updating the infotainment system software on vehicles equipped with an Infotainment 3 system (RPO IOR, IOS, IOT, IOU, IOV), SPS (Service Programming System) and/or […]

September 30, 2021
Resetting a Mobile Device for Connectivity Issues

Resetting a Mobile Device for Connectivity Issues

Concerns about mobile device connections – Apple and Android –on a vehicle equipped with an Infotainment 3 system (RPO IOR, IOS, IOT, IOU, IOV) can be difficult to reproduce and […]

September 30, 2021
Thermal Bypass Valve Installation

Thermal Bypass Valve Installation

When performing transmission repairs on 2016-2019 Silverado and Sierra models and 2015-2020 Tahoe, Suburban and Yukon models equipped with the 6L80 6-speed automatic transmission (RPO MYC) for harsh shift, delayed […]

September 30, 2021
Shudder Condition When Coasting to a Stop

Shudder Condition When Coasting to a Stop

Some 2021 Silverado 1500 and Sierra 1500 trucks equipped with the 5.3L V8 (RPO L84) and 10L80 10-speed automatic transmission (RPO MQB), excluding models with RPO YK9, may have a […]

September 30, 2021
Diagnostic Charge Battery Station Software Update

Diagnostic Charge Battery Station Software Update

A new software update (DCAG1-33-24) is now available for the EL-52800 Diagnostic Charge Battery Station (DCBS). (Fig. 12) All DCBS units should be updated to the latest software version to […]

September 30, 2021
Pop Sound on Heavy Acceleration with Multiple DTCs Set

Pop Sound on Heavy Acceleration with Multiple DTCs Set

A pop sound may be heard under heavy acceleration on some 2021-2022 Encore GX and Trailblazer models equipped with the 1.2L engine (RPO LIH). In addition, one or more of […]

September 30, 2021
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. The latest service topics from GM Brand Quality and Engineering covered in […]

September 30, 2021