Monthly Archives: March 2016

R-1234yf Refrigerant Rollout Coming in 2017 Model Year

A number of 2017 Chevrolet, Buick, GMC and Cadillac models will join the current Cadillac XTS and Chevrolet Spark EV in using the new air conditioning refrigerant R-1234yf. R-1234yf is an environmentally friendly alternative to R-134a refrigerant, (Fig. 1) which … Continue reading

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GDS 2 Update Released

A number of changes to GDS 2 covering MDI and MDI 2 connections as well as graphing features are included in the recently released GDS 2 version 15.0. Here’s a summary of the changes you’ll see in the latest GDS … Continue reading

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Windows 10 Incompatibility Update

GM is actively working to certify all Techline applications for compatibility with Windows 10 in a timely manner with a goal of ensuring users will be eligible to receive the free upgrade to Windows 10. While Microsoft is actively encouraging … Continue reading

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New TAC Phone Prompts Speed Service

Nothing is more valuable to technicians than time. That’s why the U.S. GM Technical Assistance Center (TAC) phone prompts are designed to quickly get callers to the appropriate group when calling.   Based on feedback from Detroit-area dealers, Dealer Fixed … Continue reading

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Storing and Using Special Tools in the Dealership

It’s simple but true: time is money. If a service department isn’t organized, technicians can waste a lot of valuable time searching for essential and special tools or using the improper tools for proper repairs. Tools are an investment. Organizing, … Continue reading

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Forward Lamp Harness Water Intrusion

On some 2016 Camaros equipped with the 3.6L engine (RPO LGX) and without the Track Performance package (RPO Y4Q), the engine cooling fan may intermittently stop working and the Check Engine lamp may illuminate. DTCs P0480 (Cooling Fan Speed Output … Continue reading

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Auto Heated and Auto Heated/Ventilated Seats Diagnostic Tips

The 2016 ATS, CT6, CTS, Escalade models, SRX, and XTS feature available automatic heated seats. The 2017 XT5 features available automatic heated and ventilated seats. These models are also equipped with automatic climate controls. (Fig. 17)   Fig 17   … Continue reading

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Sound from Steering when Driving over Bumps

There may be a rattle or clunk sound coming from the front of some 2015-2016 Colorado and Canyon models when driving over bumps. Upon inspection, this sound may be isolated to the lower steering intermediate shaft.   A redesigned intermediate … Continue reading

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Service Know-How

10216.03D – Emerging Issues March 10, 2016   To view Emerging Issues seminars: • Log in to www.centerlearning.com –   Select Resources > Service Know-How/TECHAssist > Emerging Issues > Searchable Streaming Video; or –   Select Catalog to search for the course … Continue reading

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Bulletin Review – February 2015

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The All-New 2016 Malibu

Completely redesigned from the ground up, the 2016 Malibu midsize sedan (VIN Z) boasts new styling, advanced safety technologies and a variety of connectivity features.   The new Malibu is available in L, LS, LT and Premier (Fig. 1) trim … Continue reading

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New GM Accessories Information Center Website

The new GM Accessories Information Center gives technicians easy access to all the details on a variety of vehicle accessories — from ambient lighting to wheel lock kits — all in one place.   The new website, www.gm-aic.com (Fig. 8), … Continue reading

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System Software Makes Accessory Installation Easier

The installation of some Limited Production Option (LPO) accessories is now made easier at the dealership thanks to the system software being installed in the vehicle during production.   The GM Accessories Remote Start kit for the 2016 Malibu (VIN … Continue reading

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Using GM-Approved Battery Chargers and Booster Packs

Occasionally, a vehicle in for service or in dealership inventory may require a jump start for a dead battery. One case at a GM dealership recently illustrated the importance of proper battery maintenance and using GM-approved battery chargers or booster … Continue reading

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Transmission Adaptive Functions

Some owners of low-mileage 2015-2016 Cadillac, Chevrolet and GMC models equipped with the new 8L90 or 8L45 automatic transmission (RPOs M5U, M5T, M5N, M5X) may comment that shifting feels too firm (harsh) or that it slips or flares.   These … Continue reading

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Poor Heater Performance

Some 2015-2016 Colorado and Canyon models may have poor heater performance with the HVAC system only blowing cold air. Relearning the HVAC doors may temporarily eliminate this condition.   Remove the temperature actuator and inspect for a cracked or broken … Continue reading

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Battery Discharged Overnight

The battery may discharge overnight on some 2015-2016 Colorado and Canyon models. It may be possible to duplicate a 150 mA or 450 mA draw.   If this condition is found, inspect connector X301 (Headliner to Body Harness) near the … Continue reading

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Rear Auxiliary Heater Lines Rattle

There may be a rattle or buzz sound from the rear of the vehicle on some 2015-2016 Tahoe, Suburban, Yukon models and Escalade models. The sound may be due to the rear auxiliary heater/evaporator lines (Fig. 16) contacting each other … Continue reading

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