Diagnostic Tips

Diesel Fuel Gelling in Cold Temperatures Causing In-Tank Fuel Pump Whine and Driveability Concerns – 2010-2020 GM Passenger Cars & Trucks

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2020 Chevrolet Silverado

NHTSA ID Number: 10163226 Manufacturer Communication Number: 18NA103 Summary This Bulletin provides information to correct a customer concern of a siren or whine noise from the in-tank fuel pump at temperatures below -6C or 20F, accompanied by start and stall, no start, loss of power and MIL illuminated. Technicians may find DTCs P0087, P018B, P228A, P228B or … Read more

Coolant Leak, Coolant Consumption and/or Low Coolant Message Being Displayed On the Driver Information Center (DIC) – 2017-2023 Chevrolet Silverado & GMC Sierra

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2020 Chevrolet Silverado

NHTSA ID Number: 10222656 Manufacturer Communication Number: 18-NA-098 Summary This informational bulletin provides information for the technicians on where to look on the Duramax engine for coolant leaks.   Condition Some customers may comment on a coolant leak, coolant consumption and/or low coolant message being displayed on the driver information center (DIC).   Correction Use the illustrations … Read more

Multiple Electrical Issues, Dead Battery, Start/Stop Inoperative, Instrument Cluster and Switch Backlighting Remain Illuminated – 2017-2019 Cadillac GMC Holden

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2019 GMC Acadia

NHTSA ID Number: 10163224 Manufacturer Communication Number: 18NA063 Summary This technical bulletin provides repair information to correct customer concerns of multiple electrical issues, dead battery, start/stop inoperative, instrument cluster and switch backlighting remain illuminated.   4 Affected Products Vehicles MAKE MODEL YEAR CADILLAC XT5 2017 GMC ACADIA 2017-2019     SEOCONTENT-START Service Bulletin Bulletin No.: 18-NA-063 Date: … Read more

Side Object Sensing Alert Module Not Working Correctly and/or Incorrect Side Mirror Notification – 2017-2020 Buick Encore

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2019 Buick Encore

NHTSA ID Number: 10187378 Manufacturer Communication Number: 18NA056   Summary This service bulletin provides a procedure to apply aluminum butyl tape around the lower side object modules and the fascia to aid in deflecting the radar away from the ground and stop triggering false alerts.   4 Affected Products Vehicle MAKE MODEL YEAR BUICK ENCORE 2017-2020   … Read more

Information on Poor DEF Quality Message Displayed on Driver Information Center (DIC) and/or Malfunction Indicator Lamp (MIL) Illuminated – DTCs P249D, P249E – 2016-2021 Chevrolet Colorado & GMC Canyon

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2020 Chevrolet Colorado

NHTSA ID Number: 10183136 Manufacturer Communication Number: 17NA134   Summary This informational bulletin explains how to check the NOx Catalyst Reductant-Load Adaptive Values using GSD2.   SEOCONTENT-START Service Bulletin Bulletin No.: 17-NA-134 Date: October, 2020 INFORMATION Subject: Information on Poor DEF Quality Message Displayed on Driver Information Center (DIC) and/or Malfunction Indicator Lamp (MIL) Illuminated – DTCs … Read more