Yearly Archives: 2017

New Medium-Duty Truck Essential Tools Shipped to Dealerships

The 2018 Low Cab Forward medium-duty 4500, 5500 and 6500-series trucks (Fig. 1) are available with a variety of upfit equipment and bodies provided by independent suppliers. Several new essential tools for the air brake system on the trucks have … Continue reading

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When to Perform a Diesel Service Regeneration

A change was implemented recently in the values of the Diesel Particulate Filter (DPF) Soot Accumulation parameter displayed in GDS 2. On all 2016-2018 Colorado and Canyon models and 2017-2018 Express and Savana models equipped with the 2.8L Duramax diesel … Continue reading

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Broken Quarter Upper Panel Trim

The trim door on a quarter upper trim panel (Fig. 8) on some 2016-2018 Camaro convertible models may malfunction or may make a noise during convertible top operation. In some cases, the quarter upper trim panel may be broken and … Continue reading

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Inoperative Sunshade Auto Open Feature

Some 2017-2018 Acadia (VIN N) and 2018 Enclave and Traverse models equipped with a sunroof (RPO C3U) may have a broken front sunshade latch handle or the automatic open feature may be inoperative.   The models affected include 2018 Enclave … Continue reading

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No Memory Features for Driver 3 or 4

After adding additional keys/fobs (Remote Keyless Entry transmitters) on some 2014 Silverado 1500, Sierra 1500; 2015-2018 Silverado, Sierra, Tahoe, Suburban, Yukon and Escalade models equipped with Automatic Memory Recall (RPO A45), the Driver Information Center (DIC) may display a “You … Continue reading

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Close TAC Cases Using the Dealer Case Management System

The Dealer Case Management (DCM) system that was introduced nationwide (U.S. only) in August 2017 was designed to simplify communication with GM dealerships while increasing the speed and efficiency of Technical Assistance Center (TAC) case resolution. All communication for a TAC case … Continue reading

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Latest AFIT Software Updates High-Pressure Fuel Pump Coverage

The latest software release for the Active Fuel Injector Tester, or AFIT, (CH-47976) is now available. The release (CH-47976-230) updates the fuel pressure regulator software used in the AFIT DMU (Drive & Measurement Unit) as well as updates the AFIT … Continue reading

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Proper 6.2L V8 Charge Air Cooling System Draining

The 6.2L V8 engine (RPO LT4) available in 2016-2018 Camaro ZL1, Corvette Z06 and CTS-V models features an Eaton Roots-type supercharger (Fig. 6) that creates a maximum boost pressure of 9.7 psi. The air entering the supercharger is cooled by an … Continue reading

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Reconnect Fog Lamps after Accessory Installation

When installing GM Accessories, such as a front grille or front bow tie accessory, on 2015-2018 Colorado and Canyon models (Fig. 8), all associated components must be reconnected before installation is complete. In some recent warranty claims, it has been … Continue reading

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Transfer Components during New Seat Frame Installation

When replacing the seat cushion frame on any GM model, it’s critical to transfer the necessary parts from the current seat frame to the new frame. Recently, the GM Warranty Parts Center has received several seat cushion frames that still … Continue reading

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Normal Tailgate Cable Slack

With the tailgate down, one of the tailgate cables may appear to have slack in it on some 1998-2000 Chevrolet C/K Classic, GMC C/K Classic; 1998-2004 S10, Sonoma; 1999-2018 Silverado Sierra; 2002-2013 Avalanche, Escalade EXT; 2004-2012 Colorado, Canyon; and 2015-2018 … Continue reading

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Service Know-How

10217.12V – Emerging Issues December 14, 2017   The latest service topics from Brand Quality and Engineering are reviewed, including an in-depth look at fluid leakage vs. seepage (Fig. 16) and an introduction to the new 2018 Buick Regal.   … Continue reading

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GM Auto Engine Stop/Start Systems

The Engine Stop/Start system, which automatically turns off the engine when the vehicle comes to a stop in appropriate driving conditions, can reduce fuel consumption and carbon dioxide (CO2) emissions by up to 5% in mixed driving conditions. In an … Continue reading

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Enhanced Starter Motor Operation in Engine Stop/Start Systems

The Engine Stop/Start system in GM vehicles automatically turns off the engine when the vehicle comes to a stop under certain driving conditions, and can quickly restart the engine in about 0.3 seconds when commanded to do so.   A … Continue reading

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New Pedestrian Impact Detection System

A new safety system on the 2018 Buick Regal is the Pedestrian Impact Detection System (PIDS). (Fig. 9) Its primary function is to provide supplemental protection to pedestrians involved in vehicle impacts by raising the hood to create sufficient vertical … Continue reading

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Rear Camera Image Distortion

The Rear Vision Camera or Surround Vision Camera on some 2018 Traverse and Enclave models may have a yellow or blue display (Fig. 13) with a blurry or distorted image (Fig. 14), a display showing only gridlines, or a blue … Continue reading

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2018 Mark of Excellence Program Enrollment Going on Now

The 2018 GM Mark of Excellence Recognition Program enrollment period has been extended to February 9, 2018. All U.S. GM dealers are encouraged to enroll their service technicians in the program, which recognizes top dealership service technicians with the National … Continue reading

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2018 Buick Regal Debuts with New Models

For the 2018 model year, the Buick Regal is all new and features two new body styles — Sportback and TourX (Fig. 1) — and an aggressive top-of-the-line GS model. The Sportback is available in Front-wheel drive (FWD) and All-wheel … Continue reading

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GDS2 Core Software Version 19 Released

A new version (19.0.04100) of the GDS2 core software has been released recently. The new release includes numerous software fixes, including a resolution to the Vehicle-wide DTC concern as well as numerous visual updates to improve the readability of the … Continue reading

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Warranty Claim Codes Verify Repairs

When repairs involve control module reprogramming, technicians must document the Warranty Claim Code on the shop copy of the job card. The Warranty Claim Code is provided in the Service Programming System (SPS) when programming is complete. (Fig. 10)   … Continue reading

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Successful Control Module Programming

It’s becoming second nature for many repairs — reprogramming vehicle control modules with updated calibration files using the Service Programming System (SPS). (Fig. 12) The calibration files contain the data that manage vehicle control functions. The programming process uses Pass-Thru … Continue reading

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Super Cruise Freeways Near You

The Super Cruise hands-free driving technology available on the 2018 Cadillac CT6 automatically steers the vehicle to maintain lane position when driving on limited-access freeways.   GM has mapped over 130,000 miles of limited-access freeways for the Super Cruise system … Continue reading

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Coaxial Cable Repair Kit Now Available

GM has implemented a new service strategy using universal coaxial cable repair kits to repair cables used for high frequency signals, such as cellular (OnStar), satellite radio (XM), GPS (navigation, and the AM/FM signal, on 2006-2018 GM models. There are … Continue reading

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EV Battery Service and Depowering Tool Software Update

A software update for the EL-50332 EV Battery Service and Depowering Tool (Fig. 10) is now available through the Service Workbench selection of “Essential Tools – Software Updates” in GM GlobalConnect. The update (EL-50332-370H) includes programming enhancements to increase the … Continue reading

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