Monthly Archives: April 2017

Misdiagnosis of Returned Turbochargers

All turbochargers that are returned to the Warranty Parts Center (WPC) are inspected by GM Engineering for root cause failure. Many of the turbochargers from 2011-2016 Cruze, 2012-2018 Sonic, 2013-2018 Encore, and 2014-2018 Trax models equipped with the 1.4L turbocharged … Continue reading

Posted in Uncategorized | 2 Comments

Diagnosing Communication U Codes before Replacing Parts

If the Driver Information Center (DIC) displays a “Steering Assist Reduced” message on a vehicle that comes into the dealership for service, it makes sense to check the steering components, right? But what if there are two DTCs set: P0128 … Continue reading

Posted in Uncategorized | Leave a comment

Speedometer Indicates Lower Speed than Vehicle is Traveling

The speedometer reading may be inaccurate on some 2015-2017 Express, Savana, Silverado, Sierra, Tahoe, Suburban, Yukon, and Escalade models. (Fig. 7) The speedometer may indicate a lower mph than the vehicle is actually traveling. The inaccurate speedometer reading may occur … Continue reading

Posted in Uncategorized | Leave a comment

Improper Engine Gasket Cleaning Methods Using Surface Conditioning Discs

When cleaning engine gasket sealing surfaces or cleaning parts from an engine that are to be reused, it’s critical to not use surface conditioning discs, such as abrasive pads or bristles. These discs can cause damage to the sealing surface … Continue reading

Posted in Uncategorized | Leave a comment

Loose Charge Air Cooler Ductwork

Loose connections of the charge air cooler ductwork on some 2017 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P) may result in an illuminated Check Engine light and DTCs P0101, P0299, P11CC, P11DC, P20EE, P2002 … Continue reading

Posted in Uncategorized | 1 Comment

Engineering Information Bulletins and Part Restrictions

Posted in Uncategorized | Leave a comment

New Colorado ZR2 Takes Off-Roading to New Heights

The new 2017 Colorado ZR2 (Fig. 1) is designed to excel off-road, whether that’s tackling out-of-the-way two-tracks, technical rock crawling, or desert running. At its introduction, the ZR2 boasts more off-road technology than any other mid-size pickup.   Fig. 1 … Continue reading

Posted in Uncategorized | Leave a comment

A Salute to TechLink Contributor Dave Nowak

Meticulous may be the best way to describe Dave Nowak. Everything he had a hand in was detailed, thoughtfully planned out, and developed with a keen understanding of how the results would affect others. This goes for his professional work … Continue reading

Posted in Uncategorized | 2 Comments

Top Questions on 2018 Equinox

The Chevrolet Equinox is an all-new model for 2018 with a variety of new features that may be unfamiliar to some customers. As a result, customers may bring their vehicle into the dealership for service when a system is actually … Continue reading

Posted in Uncategorized | Leave a comment

Passenger Presence System Service Kit

When diagnosing a failed Passenger Presence System (PPS) pressure sensor on current models of the Buick Cascada, Envision, LaCrosse; Chevrolet Bolt, Camaro, Colorado, Corvette, Cruze, Malibu, Silverado, Spark, Suburban, Tahoe; Cadillac CT6, Escalade, XT5; GMC Acadia, Canyon, Sierra, and Yukon, … Continue reading

Posted in Uncategorized | Leave a comment

UPDATE: Quick Learn Procedures for Programming 2017MY Keys and Key Fobs

New for 2017 model year vehicles, two keys that are already programmed or two previously learned Remote Keyless Entry (RKE) transmitters (key fobs) need to be present in order to use the quick learn procedure for adding keys (Fig. 17) … Continue reading

Posted in Uncategorized | Leave a comment

Spin-On Oil Filter Replacement

The correct match of oil filter to engine application is more important now than ever with the tight tolerances, two stage oil pumps and high flow lubrication requirements of today’s modern engines.   Beginning in 2012, oil pumps began to … Continue reading

Posted in Uncategorized | 2 Comments

Service Know-How

10217.05V – Emerging Issues May 11, 2017   The latest service topics from Brand Quality and Engineering are reviewed, including servicing full-size truck camper mirrors (Fig. 21) and headliner repairs on 2017 XT5.   Fig. 21   To view Emerging … Continue reading

Posted in Uncategorized | Leave a comment