2021

Diagnostic Tip to Diagnose Emission Reduction Fluid Tank Heater Element Exposed to Diesel Exhaust Fluid (DEF) , Service Emission System/Service Exhaust Fluid System Displayed on the Driver Information Center (DIC), Malfunction Indicator Lamp (MIL) Illuminated – DTC P20BB and/or P20C3 Set – 2020-2021 Cadillac Chevrolet GMC

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2021 Chevrolet Suburban

NHTSA ID Number: 10187767 Manufacturer Communication Number: 21NA002   Summary This informational bulletin provides a test procedure, for a possible faulty DEF Heater.   13 Affected Products Vehicles MAKE MODEL YEAR CADILLAC ESCALADE 2021 CADILLAC ESCALADE ESV 2021 CHEVROLET SILVERADO 1500 2020-2021 CHEVROLET SILVERADO 2500 2020-2021 CHEVROLET SUBURBAN 2021 GMC SIERRA 1500 2020-2021 GMC SIERRA 2500 2020-2021 … Read more

Information on Transmission Flares, Slipping, Gear Hunting, Harsh Shifting, Only Shifts at Wide Open Throttle (WOT) or Hard Acceleration, Rolling in Reverse or in Wrong Direction Selected, High Engine RPM, Shift Busyness, Surging While Cruising, Will Not Upshift, Holds in a Lower Gear, Will Not Back Up Hills, Not Shifting, Jerks and/ or Loss of Power – 2019-2021 Buick Chevrolet

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2021 Chevrolet Trailblazer

NHTSA ID Number: 10187768 Manufacturer Communication Number: 21NA004   Summary This service bulletin provides information explaining possible normal CVT automatic transmission performance.   6 Affected Products Vehicles MAKE MODEL YEAR BUICK ENCORE GX 2020-2021 CHEVROLET MALIBU 2019-2021 CHEVROLET TRAILBLAZER 2021     SEOCONTENT-START   Service Bulletin Bulletin No.: 21-NA-004 Date: January, 2021 INFORMATION Subject: Information on Transmission … Read more

Diagnostic Tip to Diagnose Emission Reduction Fluid Tank Electrical Connector Inspection, Reduced Power Message, Service Emissions System, System Displayed on the Drivers Information Center (DIC) Malfunction Indicator Lamp (MIL) Illuminated – DTC P02C1, P21DD, P221C, P10D9, P10F3, P143C, P20B9, and/or P221E – 2020-2022 Cadillac Chevrolet GMC

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NHTSA ID Number: 10224850 Manufacturer Communication Number: 21-NA-006 Summary This bulletin provides a possible location of a bad connection at the reductant fluid tanks electrical connector.   Condition Some customers may comment that the MIL is illuminated and a reduced power message with a Service Emissions System message as well. Some technicians may one or more of … Read more

Diagnostic Tip to Diagnose Emission Reduction Fluid Tank Electrical Connector Inspection, Reduced Power Message, Service Emissions System, System Displayed on the Drivers Information Center (DIC) Malfunction Indicator Lamp (MIL) Illuminated – DTC P02C1, P21DD, P221C, P10D9, P10F3, P143C, P20B9, and/or P221E – 2020-2021 Cadillac Chevrolet GMC

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2021 Chevrolet Suburban

NHTSA ID Number: 10187770 Manufacturer Communication Number: 21NA007   Summary This technical bulletin provides a procedure to program the reductant fluid module if found the cause of the customers concern.   8 Affected Products Vehicles MAKE MODEL YEAR CHEVROLET SILVERADO 1500 2020-2021 CHEVROLET SILVERADO 2500 2020-2021 GMC SIERRA 1500 2020-2021 GMC SIERRA 2500 2020-2021     SEOCONTENT-START … Read more

Loss of Digital Speedometer DIC Displays After Manual Regen – 2020-2021 Chevrolet Silverado & GMC Sierra 2500HD/ 3500HD

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2021 Chevrolet Silverado

NHTSA ID Number: 10187775 Manufacturer Communication Number: 21NA012   Summary This technical bulletin provides repair information to correct a customer concern of Clean Exhaust Filter, Perform Manual Regen, and Loss of Digital Speedometer DIC Displays.   4 Affected Products Vehicles MAKE MODEL YEAR CHEVROLET SILVERADO 2500 2020-2021 GMC SIERRA 2500 2020-2021     SEOCONTENT-START Service Bulletin Bulletin … Read more