2020 Chevrolet Silverado Common Problems & Defect Telemetry

“The wiring harness failed causing erratic and unpredictable behavior at 65 MPH on this 2020 Chevrolet Silverado 1500 with 77,500 miles on the odometer. General Motors no longer makes the wiring harness and there are none available in the market. This otherwise flawless truck (...”

“While driving at highway speed, my vehicle developed a serious transmission problem. At approximately 75 mph, it suddenly lost the ability to maintain speed and dropped to about 55 mph despite throttle input. Engine RPM increased significantly and the vehicle had greatly reduc...”

“The check engine light indicate P0016 crankshaft camshaft position. It has been diagnosed by a mechanic that the timing belt is stretched. Chevrolet has redesigned these parts due to the premature failure but has not issued a recall to install the redesigned parts.”

“While driving at highway speed, my vehicle developed a serious transmission problem. At approximately 75 mph, it suddenly lost the ability to maintain speed and dropped to about 55 mph despite throttle input. Engine RPM increased significantly and the vehicle had greatly reduc...”

“On the transmission for the 8-speed I'm wondering why mine hasn't been recalled when all the others have been recalled were made the same basically time. And I'm having the same issues as those other transmissions”

“The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the vehicle was running rough and the vehicle lost automotive power. The check engine warning light was illuminated. Additionally, the transmission made an abnormal...”

“The Electronic Parking Brake System on my 2020 Chevy Silverado 1500 continuously malfunctions. Chevy/ GM Customer Support has been made aware of this issue and continues to disregard it entirely. The Electronic Parking Brake, which is an automatic function that cannot be turne...”

“While driving my truck it started flashing all the service lights on the dash, and then started shaking bad and making a loud ratcheting noise from the transfer case/transmission and a loud knock/tick from the engine. I scanned for codes and it has all loss of communication co...”

“The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the vehicle experienced a loss of drive power with high RPM. The check engine, traction control, ABS, and parking brake warning lights were illuminated, and the mes...”

“The wiring harness failed causing erratic and unpredictable behavior at 65 MPH on this 2020 Chevrolet Silverado 1500 with 77,500 miles on the odometer. General Motors no longer makes the wiring harness and there are none available in the market. This otherwise flawless truck (...”

“Unknown which system failed. While driving on the freeway, truck lost power for a few seconds. Dash lights turned off and back on. Our safety and the safety of others on the freeway were at risk as we had no control of the vehicle. Have not had the truck checked for the proble...”

“Odometer Fraud. The contact owns a 2020 Chevrolet Silverado 1500. It was discovered that there was a mileage discrepancy. The contact stated that at the time of purchase, the vehicle mileage was approximately 54,753. The current mileage was approximately 56,000. As per a Carfa...”

“I'm experiencing all the documented issues with the 10L80 10 speed transmission. Identical to all the recalls. It's shifting poorly, torque converter shudder, lose of power, unreliability, and serious safety concerns. I've tried to communicate and find a resolution to these is...”

“While driving my truck it started flashing all the service lights on the dash, and then started shaking bad and making a loud ratcheting noise from the transfer case/transmission and a loud knock/tick from the engine. I scanned for codes and it has all loss of communication co...”

“I am writing to formally report a persistent and dangerous manufacturing defect regarding the rear window and seating assemblies in my 2020 Chevrolet Silverado. I have already had GM replace the rear window in 2023, it needs replaced again now in 2026. The rear window seal is ...”

“The contact owns a 2020 Chevrolet Silverado 1500. The contact stated while driving at 35 MPH, the engine started knocking, and the sound grew louder while making a turn. The Electronic Stability Control and check engine warning lights illuminated. The vehicle was taken to a lo...”

“At highway interstate travel speeds, vehicle was losing intermittent power. Exhaust at stopped, idle during trip smelled heavily of gasoline. White smoke blowing from exhaust with only 38k miles on the truck. Dealership is replacing the entire engine now and sounds like GM doe...”

“The component that failed was the wiring harness installed in the engine area. the harness was installed right next to a dip stick. The dip stick has a sharp metal piece welded to it and it punctured the harness cutting wires on the inside. This could have been a potential fir...”

“I am writing to formally report a persistent and dangerous manufacturing defect regarding the rear window and seating assemblies in my 2020 Chevrolet Silverado. I have already had GM replace the rear window in 2023, it needs replaced again now in 2026. The rear window seal is ...”

“The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving 70 MPH, the transmission independently shifted to 4-WD. No warning lights were illuminated. The contact stated that the vehicle decelerated to 55 MPH, and the rear wheels locked up. The con...”

“Rear window is leaking onto the carpet beneath it creating mold and could allow water to enter the SRS module. Currently i have a tray blocking that water but without that the SRS system could be affected by the water entering the cabin through the rear window.”