Monthly Archives: December 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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | 2 Comments

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment

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

Posted in Uncategorized | Leave a comment