Diagnostic Tips for Exhaust Charge DTCs
Several high-pressure exhaust charge DTCs may set on some 2019-2022 Silverado, Sierra; 2021-2022 Tahoe, Suburban, Escalade; and 2022 Yukon models equipped with the 5.3L engine (RPO L84) or 6.2L engine […]
Several high-pressure exhaust charge DTCs may set on some 2019-2022 Silverado, Sierra; 2021-2022 Tahoe, Suburban, Escalade; and 2022 Yukon models equipped with the 5.3L engine (RPO L84) or 6.2L engine […]
Some 2021-2022 Encore and Trax models equipped with the 1.4L engine (RPO LE2) may have DTC P0442, (Evaporative Emission [EVAP] System Small Leak Detected) set in the ECM. The DTC […]
Some 2020-2022 CT4 and CT5 models equipped with the limited-slip differential (RPO G80) may have a moan sound during left or right turns. The condition may be caused by a […]
A rattle sound from under the vehicle while driving may be heard on some 2021-2023 Silverado 1500, Silverado 2500HD/3500HD, Tahoe, Suburban, Sierra 1500, Sierra 2500HD/3500HD, Yukon, Escalade; and 2022 Silverado […]
Residue on the rear liftgate strut (Fig. 8) of some 2018-2020 Enclave, Traverse; 2020-2022 Acadia, XT5 and XT6 models is not a fluid leak that requires strut replacement. The residue […]
While fording a river with the 2022 HUMMER EV pickup (Fig. 11), an excessive amount of water may slow or stop the cooling fan from spinning, which may cause DTC […]
A rattle or clunk sound may be heard at the front of the vehicle on some 2017-2023 Acadia; 2018-2023 Traverse; 2019-2023 Blazer; and 2020-2023 XT5 models. The sound may seem […]
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 […]