What do i do about service code p0446 on a 2001 cheve silverado 1500

Do you have power in and out of the pump relay when the key is turned on ?

There are many things that can cause you problem. The flashing light indicates "open loop" or "limp mode". This is the computer's last effort to keep the vehicle running and maintenance must be performed ASAP. I can assure you that if you are in limp mode there WILL be some code(s) set in the computer. Have them read and repair accordingly.

45 to 60 psi running,,,any lower it will not run right,,,also check the fuel filter it could be stopped up,,even if you just replaced it

Failed Evap System Vent Solenoid Valve

Have you got a dash light on?

If so have you not checked for codes
or taken into a shop?

Hi, this is a pretty common problem on these Silverado instrument clusters. We can repair that for you, click here to learn more about these silverado instrument cluster problems: Dr Speedometer Instrument Cluster Repair Speedometer Repair Guage...

the light only stays on when the system is having a current problem, the only way to make it stay off is have it scanned for codes, and then the system codes diagnosed and repaired, it could be as easy as a bad connection

It is for the canister vent solenoid. Gm has a service bulletin out on this. They have changed the location of the solenoid. They have a repair kit for about 100 dollars that comes with the solenoid and the lines and instructions for moving the solenoid to its new location.

both are on passenger side of instrument panel drivers side actuator on bottom of heater case passenger on top of heater case

the reason your service 4x4 light is on there is a code that will have to be diag. and repaired then it can be cleared with a scan tool