Diagnostic Tips

Engine Related Shudder / Surge Concerns – 2019-2021 Cadillac Chevrolet GMC

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2021 Chevrolet Tahoe

NHTSA ID Number: 10201315 Manufacturer Communication Number: PIP5794B   Summary This Preliminary information communicates diagnostics to the dealer involving a vehicle shudder concern caused by the camshaft actuator system that can be mistaken for a transmission issue.     26 Affected Products Vehicles MAKE MODEL YEAR CADILLAC ESCALADE 2020-2021 CHEVROLET SILVERADO 1500 2019-2021 CHEVROLET SILVERADO 2500 2019-2021 CHEVROLET … Read more

Lack of Power or Poor Performance During High Ambient Temperatures with RPO (C7N) 12,300 LB GVWR or (C4M) 9,900 LB GVWR – 2016-2020 Chevrolet Express & GMC Savana

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2020 Chevrolet Express

NHTSA ID Number: 10193437 Manufacturer Communication Number: PIP5800   Summary This Preliminary information communicates some customers may comment that the vehicle exhibits a lack of power when driving up grades or after the vehicle has been idling for long periods of time in high ambient temperatures (90 degrees or above). This condition is more noticeable when the … Read more

MIL Illuminated- ECM Update for P026C, P20EE, or P11D5 – 2021 Chevrolet Silverado & GMC Sierra 2500HD/3500HD

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2021 Chevrolet Silverado

NHTSA ID Number: 10198891 Manufacturer Communication Number: 21NA128   Summary This technical bulletin provides repair information to correct a customer concern of MIL Illuminated- ECM Update for P026C, P20EE, or P11D5.     4 Affected Products Vehicles MAKE MODEL YEAR CHEVROLET SILVERADO 2500 2021 CHEVROLET SILVERADO 3500 2021 GMC SIERRA 1500 2021 GMC SIERRA 2500 2021   … Read more

Vibration At Idle In Gear Or Low Speeds Remove Foreign Object Material Debris From Transmission Mount – 2015-2021 Chevrolet Colorado & GMC Canyon

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2021 Chevrolet Colorado

NHTSA ID Number: 10193441 Manufacturer Communication Number: PIP5348C   Summary This Preliminary Information communication provides information to the technician about vehicles that may have a vibration at idle in gear or at very low speeds. Technician should inspect for a stray nut or debris such as a rock wedged between the rubber and metal portions of the … Read more

Intermittent Service Theft Deterrent Message – 2021 Cadillac CT4 & CT5

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2021 Cadillac CT4

NHTSA ID Number: 10193442 Manufacturer Communication Number: PIC6433A   Summary This Preliminary information communicates that a service theft deterrent message may display with no DTC’s.   OnStar turned off the ECM read request to prevent re-occurrence.     2 Affected Products Vehicles MAKE MODEL YEAR CADILLAC CT4 2021 CADILLAC CT5 2021   Condition A customer may comment that … Read more