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 […]
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 […]
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 […]
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 […]
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) […]
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 […]
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 […]
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 […]
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 — […]
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 […]
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 […]
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 […]
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 […]
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 […]
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. […]
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 […]
Some 2017-2019 Bolt EVs may have an intermittent click sound at the front of the vehicle and the ABS, traction control and/or StabiliTrack warning lamps may illuminate on the instrument […]