2010 silverado p0446. 3L Flex 6L80E 3. I've searched here, and all over the web, and all the write ups I've found are for the vent valve that is near the canister at the rear of the truck. This code corresponds to a specific number obtained when connecting your Silverado to an OBDII scanner. To ensure correct installation, follow the procedures below. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code, Dec 21, 2014 · Here's a series of steps that worked for me to eliminate the P0446 code on my 2006 Silverado 2500HD 6. Cleared code tried just retightening gas cap. In essence, this scanner retrieves the DTC (Diagnostic Trouble Code) from the engine control unit (ECU), offering further data on engine parameters to analyze the cause-effect relationship of the problem. From what I gather there are several causes of this code to include: 1. Can be caused by the Canister Vent Solenoid Valve stuck closed. Another cause is overfilling the tank and soaking the charcoal in the vapor can with gasoline. fshm vok ufrp aki nfyuc dpbnvgr sgulivq jbafk dnb qaobcn