Monthly Archives: January 2017

All-New 2018 Equinox Hits the Road

The new 2018 Equinox (Fig. 1) is a five-passenger, four-door crossover available with front-wheel-drive (FWD) or all-wheel-drive (AWD).   The new Equinox is approximately 400 pounds (180 kg) lighter than the current model, which is a 10 percent reduction in … Continue reading

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Quick Learn Procedure for 2017 Keyed Models

New for 2017, two keys that are already programmed need to be present in order to use the quick learn procedure for adding keys to GM models (Fig. 9), excluding 2017 Acadia Limited, Enclave, Traverse, Express and Savana. On 2016 … Continue reading

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Flat/Dinghy Towing 4WD Trucks and SUVs

A Service 4WD message may display on the Driver Information Center and the transfer case may be stuck in Neutral on some 2014-2015 Silverado 4WD, Sierra 4WD; 2015 Tahoe 4WD, Suburban 4WD, Colorado 4WD, Yukon 4WD, Canyon 4WD, and Escalade … Continue reading

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Headlamp Water Intrusion

A no crank condition or dead battery may be found on some 2016-2017 Silverado 1500 and Sierra 1500 models. Other possible conditions include unable to SPS program the Engine Control Module (ECM) or the engine stays running with the ignition … Continue reading

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Engineering Information Bulletins and Part Restrictions

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Service Know-How

10217.03V – Emerging Issues March 9, 2017   The latest service topics from Brand Quality and Engineering are reviewed, including an overview of the new 2018 Equinox (Fig. 12) and diagnostic tips for the high pressure fuel pump on the … Continue reading

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New Websites and Roles for GM Dealer Services and GM Dealer Equipment

Several changes have been made recently to the different programs available to U.S. dealership service departments for GM dealer services, tools and equipment. New roles and new contacts have been put in place that dealerships can use to shop for tools … Continue reading

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Hunter Road Force Balancer Now Essential Equipment

The Hunter Road Force Balancer Generation 5 has been classified as essential equipment for all GM dealerships in the U.S. This latest generation of the Hunter Road Force Balancer (Fig. 5) is a critical part of tire/wheel assembly diagnosis.   … Continue reading

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What is Road Force? Diagnosing Tire Vibration with the Hunter Road Force Balancer

Many changes in the design of new vehicles highlight how important properly balanced and low Road Force tires are to ride quality. Advanced braking and stability systems, along with stricter fuel economy requirements, have led to the increased use of … Continue reading

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4WD Inoperative with no DTCs Set

If no power is transmitted to the front axle in 4WD on some 2015-2017 Silverado 4WD and Sierra 4WD models (RPOs NQF, NGQ), the transfer case front output shaft drive sprocket body ring may be separated. The transfer case must … Continue reading

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Vibration during 6th Gear Deceleration

The 2017 Camaro ZL1 with a manual transmission (RPO MJK) (Fig. 13) may have a vibration condition during deceleration in 6th gear. Drivers may feel the vibration in the floor, seat, console and steering wheel.   Fig. 13   The … Continue reading

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Loose ECM-TCM Ground Connection

Some 2017 Colorado and Canyon models equipped with the 3.6L engine (RPO LGZ) may have an intermittent no crank condition. There may be a loss of communication with the Engine Control Module (ECM) and Transmission Control Module (TCM), the ignition … Continue reading

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