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2020 Chevrolet Silverado 2500 HD WT 6.6L No Start, Poor Idle Quality, Stall, Misfire
Posted to GM Driveability on 9/29/2026 4 Replies

Truck will run very roughly in park with 30% throttle and die at idle, sometimes will show 50-80 rpm on scanner when cranking but no rpm when running. If I go full throttle it will hit fuel cutoff/ rev limiter so I feel like the pcm is seeing some rpm at W...

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car Vehicle Data

2020 Chevrolet Silverado 2500 HD WT

VIN [No VIN Available]
Engine6.6 L / 8 cyl / GAS
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsNo Start, Poor Idle Quality, Stall, Misfire
OccursAlways

Trouble Codes

P0335Crankshaft Position Sensor 1 Circuit Malfunction (No Signal)
P0336CKP Sensor 1 Circuit Intermittent Signal
Open Help Request

car Vehicle Data

2020 Chevrolet Silverado 2500 HD WT

VIN [No VIN Available]
Engine6.6 L / 8 cyl / GAS
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsNo Start, Poor Idle Quality, Stall, Misfire
OccursAlways

Trouble Codes

P0335Crankshaft Position Sensor 1 Circuit Malfunction (No Signal)
P0336CKP Sensor 1 Circuit Intermittent Signal