V8 Engine Crankshaft Bearing Conditions
A no crank condition may be found on some 2019-2023 Silverado, Sierra; 2021-2023 Tahoe, Suburban, Yukon and Escalade models equipped with the 6.2L V8 engine (RPO L87). The no crank […]
Charge Air Cooler Icing
Reduced engine power and an illuminated Check Engine MIL may be found on some 2019-2023 Silverado and Sierra models equipped with the 2.7L 4-cylinder turbo engine (RPO L3B). DTCs P0299 […]
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 previews the 2024 HUMMER EV SUV. (Fig. 12) […]
Active Grille Shutters Front-End Noise
Some 2021-2023 Escalade, Silverado, Tahoe, Suburban, Sierra and Yukon models may be producing a thump, clunk, pop or click noise at the front end of the vehicle. (Fig 1) The […]
2024 Models Included in Latest AFIT Software Update
The latest software update (V18.00) for the CH-47976 Active Fuel Injection Tester (AFIT) has recently been released. The software should be downloaded to ensure proper functionality of the AFIT. It […]
Fuel Feed Pipe Restriction
Some 2021-2023 Escalade, Silverado 1500, Tahoe, Suburban, Sierra 1500 and Yukon models equipped with the 5.3L V8 engine (RPO L82, L84) or 6.2L V8 engine (RPO L87) may have Reduced […]
Radio Remains On After OTA Update
After an Over-the-Air (OTA) software update on some 2021-2022 Corvette and 2022 Envision models, the radio may not turn off after the vehicle’s ignition has been turned off and the […]
Infotainment Settings Menu not Accessible on LCF Models
The Settings menu on the infotainment screen may not be accessible on some 2021-2023 LCF 3500HD, 4500/4500HD, 5500/5500XD, 6500XD and 7500XD models equipped with the optional Alpine radio (RPO UIZ). […]
New DCBS Software Update Now Available
A new software update (DCAG1-35-01) and database update (DCDG1-11) are now available for the EL-52800 Diagnostic Charge Battery Station (DCBS). All DCBS units should be updated to ensure battery testing […]
Air Suspension Low with Communication Codes Set
Some 2021-2023 Tahoe, Suburban, Yukon and Escalade models equipped with the air leveling suspension (RPO F47) may have a low or leaning suspension or the air leveling function may be […]
Dead Battery or Cruise Control Inoperative
A no start condition due to a dead battery may be found on some 2023 Blazers along with intermittent cruise control operation. Along with these conditions, the brake lights may […]
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 […]
AFIT Adapter Cable Identification and Vehicle Application Chart Update
The Active Fuel Injector Tester (AFIT) Vehicle Application Chart (Fig. 8), which can help identify the correct cable adapters for each GM model, has been updated with the latest model […]
Lunch and Learn with Field Service Engineers Each Month
Looking to get the latest technical information from Field Service Engineers (FSE)? And talk to FSEs about recent repairs you’ve experienced in your dealership? Check out the monthly FSE Lunch […]
ASE Remote Recertification Offers Convenient Testing Option
The National Institute of Automotive Service Excellence (ASE) offers a remote testing option for ASE recertification tests. With the flexible, convenient remote option, service technicians can obtain ASE recertification without […]
Dual Clutch Transmission Canister Filter and Maintenance Schedule
The Tremec DCT TR9080 dual clutch transmission (RPO M1L, M1M) on 2020-2023 Corvettes features a transmission canister filter (Fig. 3) that should be replaced at the initial 7,500-mile (12,000-km) maintenance […]
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 air spring repairs on full-size SUVs. (Fig. 7) […]
Communication DTCs Set on 3.0L Duramax Diesel Engine
Several communication DTCs may be set on some 2022 Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon and Escalade models equipped with the 3.0L Duramax diesel engine (RPO LM2). Along with […]
HFV6 Gen 2 Engine Timing Chain Installation
Proper timing chain installation on the High Feature V6 engine (RPO LGX, LGZ, LGY, LGW) requires confirming the location of the green-colored chain links. In order to get a proper […]
Front Axle Click Sound in 2WD
A squeak or click sound may be heard coming from the front of some 2019-2022 Silverado 1500, Sierra 1500; 2021-2022 Tahoe, Suburban, Yukon and Escalade models equipped with all-wheel drive/four-wheel […]
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Previous Articles
Transmission Whine Sound
March Service Newsletter from the Experts at GM TAC
Vehicle Alignment and Super Cruise
Rear Axle Differential Lock Control Actuator Condition
Diesel Exhaust Fluid Supply Pipe Contamination
FSE Technician Recognition Awards – 1st Quarter 2024
Crankshaft Bearing Diagnosis
Convertible Top Water Leak
Power Tonneau Cover Tips
GM Service Know-How Emerging Issues
MDI 2 Advanced Setup Technical Tips Update
Fuel Feed Pipe Buzzing Sound
February Service Newsletter from the Experts at GM TAC
Exhaust Resonator Rattle
Heated Steering Wheel Operation During a Remote Start
GM Dealer Equipment (GMDE)
TAC Newsletter March 2024
TAC Newsletter February 2024
Techline Connect Tips March 2023
