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2004 Chevrolet Silverado 2500 HD 6.0L Misfire
Posted to GM Driveability on 4/21/2011 14 Replies

Hi guys. I have a 2004 Chevy Silverado 2500HD. Has misfires on all cylinders. Customer replaced plugs and wires with new sets, hoping to cure the problem. We have done a crank relearn, which did not help. We replaced the crankshaft sensor, still no change. We ...

Message Closed 5/12/2011

14 Replies Received (View Replies)

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car Vehicle Data

2004 Chevrolet Silverado 2500 HD

Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
OccursCold, Hot, on Decel, Idle

Trouble Codes

P0300Multiple Misfire Detected
P0420Catalyst Efficiency Below Threshold (Bank 1)
P0446EVAP Vent Control System Performance