Speed Limited

Service Leveling System/Speed Limited Message Due to Aftermarket Modifications – 2021 Cadillac Chevrolet GMC

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NHTSA ID Number: 10202399 Manufacturer Communication Number: PIT5854 Summary This Preliminary information communicates information on vehicle speed being limited due to aftermarket lower kit being installed on the vehicle.   Condition Some customers may comment on a Service Leveling System/Speed Limited message on DIC. Dealers may find no DTC’s present.   Cause This could be caused by … Read more

Diagnostic Tip on Speed Limited Message or Reduced Propulsion Power Message Displayed on Driver Information Center (DIC) with no DTCs Set – 2016-2019 Chevrolet Volt

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2019 Chevrolet Volt

NHTSA ID Number: 10205579 Manufacturer Communication Number: 21NA259   Summary This service bulletin provides diagnostic information to correct customer concerns of Speed Limited Message or Reduced Propulsion Power Message Displayed on Driver Information Center (DIC) with no DTCs Set.     4 Affected Products Vehicle MAKE MODEL YEAR CHEVROLET VOLT 2016-2019   Condition Some customers may comment … Read more

Fleet Vehicle Aftermarket Calibrations Speed Limited to 70 mph Reduced Power With No MIL or Vibration At Idle – 2015-2021 Chevrolet Colorado & GMC Canyon

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2021 Chevrolet Colorado

NHTSA ID Number: 10204457 Manufacturer Communication Number: PIP5830   Summary This Preliminary information communicates concerns created by an aftermarket ECM calibration installed by fleet companies.  The Fleet companies install aftermarket ECM calibrations to limit the vehicle speed to approximately 70 mph and reduce the over all power output. This calibration also reduces the engine idle speed and may induce a vibration … Read more

Diagnostic Tip / Vehicle Sits Unlevel / Leans / Sags / Leveling Unavailable Message / Speed Limited Message / Service Air Suspension Message / DTC C1190 C1191 C1192 C1193 C1187 C1188 C1189 C118A C118B C118C C118E C118F – 2021 Cadillac Chevrolet GMC

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2021 Chevrolet Suburban

NHTSA ID Number: 10193457 Manufacturer Communication Number: PIT5801A   Summary This Preliminary information communicates an issue with how to properly inspect and ensure the air lines for the air suspension system are fully seated.     4 Affected Products Vehicles MAKE MODEL YEAR CADILLAC ESCALADE ESV 2021 CHEVROLET SUBURBAN 2021 CHEVROLET TAHOE 2021 GMC YUKON XL 2021 … Read more