Monthly Archives: April 2015

Dimly Lit Service Engine Soon Lamp

On some 2014 Silverado 1500 and Sierra 1500 models and 2015 Silverado, Suburban, Tahoe, Sierra, Yukon and Yukon XL (excluding Denali) models equipped with the mid-level color Instrument Panel Cluster (RPO UDD) and a gas engine, the Service Engine Soon … Continue reading

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Driver-side Door Ajar Switch and DIC Message

A Left Rear Door Ajar message may be displayed on the Driver Information Center and the dome lamps may not turn off when the doors are closed on some 2015 Express and Savana vans.   Inspect circuit 1179 for the driver-side … Continue reading

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EBCM DTC Diagnostics

When diagnosing a current DTC C1100 SYM02 (Brake Booster Vacuum Sensor Circuit Short to Ground) set on a 2013-2015 Cruze and the diagnostic flow chart in the Service Information leads to replacement of the K17 Electronic Brake Control Module (EBCM), … Continue reading

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HD Radio Operation

The AM or FM audio volume may change, mute, echo, cut in and out, repeat broadcast content, or skip intermittently on some 2013-2014 Enclave, Traverse, Acadia; 2013-2015 ATS, SRX, XTS; 2014 Regal, Captiva Sport, Corvette, Impala, Silverado 1500, Sierra 1500; … Continue reading

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Chattering Wiper Blades

The windshield wiper blades may chatter or skip across the windshield during operation on some 2015 Colorado and Canyon models built between October 1, 2014 and October 31, 2014.   The wiper arm may be twisted in the incorrect direction … Continue reading

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Wiring Repair Strategy and the J-38125 Terminal Repair Kit

GM’s global wiring repair strategy is to repair major harnesses (body, engine, instrument panel, forward lamp, etc.) whenever possible and to service minor harnesses (door, seat, steering column, etc.) as assemblies.   This direction was established to reduce the number … Continue reading

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Data Bus Diagnostic Tool Update

A software update to the Data Bus Diagnostic Tool application was released recently. The update includes screen shot functionality to help prevent accidental data loss.   Screen Shots   The application does not have a recording function, but it will … Continue reading

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New AFIT SIDI Kit Adapters and Software

Updates to the Active Fuel Injector Tester (AFIT) Spark Ignited Direct Injection (SIDI) Diagnostic Kit, essential special tool CH- 47976-500A, are currently being released to dealerships.   CH-47976-503 G3 Cable (Fig. 1)   One update includes a new cable (CH-47976-503 … Continue reading

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Bulletin Review – March 2014

Bulletin Category Bulletin Number Subject Models Body Hardware and Trim 08-08-49-006C Front Floor Console Rear Ashtray/Bin Door May Not Close 2008-2013 Cadillac CTS Body and Accessories 05-08-46-006T Information on Upgrading Certain OnStar® Analog/Digital-Ready Systems to OnStar® Generation 6 Digital-Capable System … Continue reading

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Service Know-How

10215.04D – Emerging Issues April 9, 2014 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 number, and … Continue reading

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Installing the Correct Replacement Spin-On Oil Filter

Beginning in 2012, the V6 engine (RPOs LFW, LFX, LLT) available in 2012-2016 Enclave, LaCrosse; 2012 SRX; 2013-2016 SRX, XTS; 2012-2013 Captiva (VIN L), Impala; 2012-2016 Equinox, Traverse; 2014-2016 Captiva (VIN L), Impala (VIN W), Impala (VIN (1); and 2012-2016 … Continue reading

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Detent Felt as the Accelerator Pedal is Applied

As the accelerator pedal is applied approximately 3/4 of the way on some 2015 Escalade, Silverado, Sierra and Yukon Denali models equipped with the 8-speed automatic transmission (RPO M5U), a detent/click may be noticed with a feel of increased resistance … Continue reading

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Diagnosis of Various HVAC Conditions

On some 2015 ATS, CTS, XTS, Corvette, Colorado, Canyon, Silverado 1500, Sierra 1500; and 2015 Escalade, Silverado 2500/3500, Sierra 2500/3500, Tahoe, Suburban, and Yukon models with the 2015 mid-year RPO AVF, any of the following HVAC conditions may be present: … Continue reading

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Headlamp Performance

On some 2014 Sierra 1500 and 2015 Sierra models, poor headlamp performance may be noticed when driving in very dark rural areas. While the headlamps meet all federal (FMVSS) requirements, some owners may request better headlamp performance. When addressing headlamp … Continue reading

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Weather Conditions’ Effect on High-Performance Brake Components

Some 2012–2015 Camaro SS, Camaro ZL1; 2013–2016 ATS; 2014–2016 CTS (VIN A); 2014–2015 Camaro Z/28, Caprice PPV, Corvette, and SS models may be hard to move after the vehicle has been parked for a period of time. A crunch sound … Continue reading

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HVAC System Operation during a Remote Vehicle Start

The HVAC system, heated seats, and rear defogger operate differently during a remote start on 2015 Colorado and Canyon models equipped with Remote Start (RPO BTV or S6P) depending on which HVAC system is used. Here are the details about … Continue reading

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Reprogramming Procedures for the 8L90 8-Speed Transmission

Several reprogramming procedures must be performed after replacement of some components on the new 8L90 8-speed transmission available on the 2015 Corvette, Silverado, Sierra, Yukon, Yukon XL, and Escalade. These procedures are covered in detail in the appropriate Service Information. … Continue reading

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All-New 8L90 8-Speed Automatic Transmission

During the development of the all-new, GM-developed Hydra-Matic 8L90 8-speed automatic transmission (RPO M5U) (Fig 1), offered on the 2015 Corvette, Silverado, Sierra, Yukon, Yukon XL, and Escalade, more than 550 computer-aided engineering analyses were made to ensure strength, durability, … Continue reading

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