Archive for July, 2022

Diesel Exhaust Fluid Contamination in the Fuel System

Diesel Exhaust Fluid Contamination in the Fuel System

Poor diesel engine performance conditions, such as hard starts, rough running or hesitations and low fuel pressure, may be the result of fuel system contamination. The most common sources of […]

July 29, 2022
New Components Available for Pre-Repair Authorization Using the CSMT App

New Components Available for Pre-Repair Authorization Using the CSMT App

Warranty replacement of a number of components, including wheels, seat covers and cushions and interior door trim, requires GM pre-authorization before repairs are made (U.S. and Canada). The Pre-Repair Authorization […]

July 29, 2022
Two Seal Designs Included in 10-Speed Transmission Auxiliary Pump Seal Kit

Two Seal Designs Included in 10-Speed Transmission Auxiliary Pump Seal Kit

Replacing the control valve body on the 10-speed automatic transmission (RPO MHS, MHT, MHW, MHX, MQA, MQB, MQC, MQL) with the auto engine stop/start feature, available on 2019-2020 CT6; 2019-2022 […]

July 29, 2022
Front Heated Seat Malfunction After Collision Repairs

Front Heated Seat Malfunction After Collision Repairs

Heated seat operation may be inhibited on GM models equipped with the Global A electrical architecture if the vehicle was in a collision. If the front heated seats (Fig. 13) […]

July 29, 2022
Service Transmission Messages Require Engine Control Module Reprogramming

Service Transmission Messages Require Engine Control Module Reprogramming

Some 2022 Bolt EV and Bolt EUV models (Fig. 16) may have a “Service Transmission, Unable to Shift” message or “Service Transmission Now, Unable to Shift Soon” message displayed on […]

July 29, 2022
New GM Global EPC Update Offers Email Function, Expanded Display of Parts and More

New GM Global EPC Update Offers Email Function, Expanded Display of Parts and More

The July 2022 update to the GM Global Electronic Parts Catalog (EPC) includes a number of new features that add to the functionality of the EPC, making parts searches easier […]

July 20, 2022
Fuel Additives Impact on Fuel Quality

Fuel Additives Impact on Fuel Quality

Various unproven products over the years have claimed to improve vehicle fuel economy. Many of these product benefits are based on unsubstantiated claims. In fact, the U.S. Federal Trade Commission […]

July 20, 2022
New 2022 Silverado 1500 and Sierra 1500 Boast Updated Looks, Advanced Features

New 2022 Silverado 1500 and Sierra 1500 Boast Updated Looks, Advanced Features

The new 2022 Chevrolet Silverado 1500 (Fig. 9) and GMC Sierra 1500 offer a number of enhancements as part of a mid-year launch. The updated models feature new designs — […]

July 20, 2022
2023 LYRIQ TAC Action Center Now Open

2023 LYRIQ TAC Action Center Now Open

The GM Technical Assistance Center, or TAC, (U.S.) has established an Action Center for the all-new 2023 Cadillac LYRIQ EV. (Fig. 16)   Fig. 16   TAC Action Centers are […]

July 20, 2022
July Service Newsletter from the Experts at GM TAC

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

July 20, 2022
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 […]

July 20, 2022
Reducing Wi-Fi Interference in the Service Department

Reducing Wi-Fi Interference in the Service Department

A wireless network in the dealership service department offers the freedom of connecting a variety of devices without being tethered by wires. But wireless networks have limits since, in a […]

July 11, 2022
Front Brake Squeal Sound During Light Brake Application

Front Brake Squeal Sound During Light Brake Application

Some 2020-2022 Encore GX and 2021-2022 Trailblazer models may have a squealing sound originating from the front of the vehicle during light brake pedal application. (Fig. 5) The sound may […]

July 11, 2022
Common Customer Trailer-Side Faults When Using the Trailering App

Common Customer Trailer-Side Faults When Using the Trailering App

The 2019-2022 Silverado 1500, Sierra 1500; 2020-2022 Silverado 2500HD/3500HD, Sierra 2500HD/3500HD; and 2021-2022 Tahoe, Suburban, Yukon and Escalade offer a number of systems designed to help make towing easy. (Fig. […]

July 11, 2022
Component Names for the Air Leveling and Electronic Suspension Control Systems

Component Names for the Air Leveling and Electronic Suspension Control Systems

The Air Leveling Suspension (RPO F47) and the Electronic Suspension Control System (RPO Z95) are available on 2021-2022 Tahoe, Suburban, Yukon and Escalade models. When servicing these systems, it’s important […]

July 11, 2022