Sierra

Whine Noise Operating In 4WD – 2015-2018 Chevrolet Silverado & GMC Sierra

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2018 Chevrolet Silverado

NHTSA ID Number: 10126957 Manufacturer Communication Number: PIP5245B Summary This Preliminary Information communication provides information to the technician on how to diagnose vehicles with various noises associated with four wheel drive operation. Before beginning any diagnosis it is imperative to review the Symptoms – Transfer Case in Service Information and perform the necessary inspections. In all cases … Read more

Intermittently Service Front Camera Message With DTCs U023A and/or U026A – 2016 Cadillac Chevrolet GMC

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2016 Cadillac CT6

NHTSA ID Number: 10096225 Manufacturer Communication Number: PIT5482B Summary THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT MAY HAVE A “SERVICE FRONT CAMERA” MESSAGE ON THE DRIVER INFORMATION CENTER INTERMITTENTLY. WHEN THE TECHNICIAN USES THE SCAN TOOL TO CHECK FOR DIAGNOSTIC TROUBLE CODES A HISTORY U023A AND/OR U026A MAY BE SET IN THE … Read more

Installation Of Upfitter Auxiliary Switches (RPO 9L7) – 2014-2019 Chevrolet Silverado & GMC Sierra

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2017 Chevrolet Silverado

NHTSA ID Number: 10147377 Manufacturer Communication Number: PIT5298C   Summary This Preliminary Information communication provides information to the technician on installing Regular Production Option Code 9L7 Up-fitter Auxiliary Switches. Technician will need to reference the latest version of General Motors Up-fitter Integration Bulletin 110. The information can be found at https://www.gmupfitter.com/ under the “Technical Bulletin” Tab and … Read more

Faint High Pitched Whine Noise In Auto 4 Wheel Drive – 2014-2017 Chevrolet GMC Cadillac

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2017 Chevrolet Silverado

NHTSA ID Number: 10096054 Manufacturer Communication Number: PIP5261A Summary THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN THAT SOME VEHICLES MAY HAVE A HIGH PITCHED WHINE NOISE FROM THE VEHICLE NOTICED WHEN DRIVING IN AUTO 4WD. WHEN THE TRANSFER CASE CONTROL MODULE HAS TO MOVE THE TRANSFER CASE ACTUATOR MOTOR THE HIGHER CURRENT PASSING THROUGH THE … Read more

Diagnostic Tip – Diesel Exhaust Fluid System Contamination – 2010-2023 Chevrolet & GMC

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Chevrolet GMC Cadillac

NHTSA ID Number: 10222781 Manufacturer Communication Number: 19-NA-237 Summary This informational bulletin explains how to identify possible DEF contamination.   Condition Some customers may comment on one or more of the following conditions: Exhaust fluid quality poor message on the Driver Information Center (DIC). Diesel exhaust fluid warning lamp on. Other exhaust fluid quality related concerns.   … Read more