A somewhat common problem with older vehicle is that the hydraulic (flexible)brake hoses swell shut . Their is enough pressure to apply the brakes but not enough spring pressure to overcome the collapse hoses. Replace all flexible brake hoses the rebleed brakes .
SOURCE: 2006 5.3ltr chevy silverado z71 p0455 andp0449
These codes are for the evaporative emission system.The 455 is the vent solenoid.The 455 is a large leak in the evap.system.The vent solenoid I would replace because they go bad and will not work because they are under the vehicle in the rear of the truck.There is a bulletin for these and the vent valve is installed in another spot.The number for the bulletin is 02-06-04-037E.You should also look for a broken or loose hose or pipe that might have came off.Specially if you ran over something.If none found it could just be the vent solenoid stuck in the venting position.Good luck.
SOURCE: The lock on the spare
Easiest and Cheapest fix is to torch it or hacksaw it unable the spare tire is free! Then put your tire in the back or your truck! There are tire carriers designed for your bed! Check out LMC trucks it's where I found out about it... I've already moved my tire to the bed just to elminate this extremely common problem with using the factory tire carrier under the truck... Think about it... Where does all the snow and water go on your truck? Under the truck, right? So aviod using the facotry location at all cost or it will cost you... Someday...
SOURCE: how do i unlock the
did you try (0000)if not you will have to contact the dealer and give them the vin they should be able to give you the code
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