code p2261 supercharger/bypass valve
 

Can anyone tell me anything about this code? Car runs fine, getting proper boost but poor gas mileage.... 2007 Cobalt SS/SC only mods is ZZP midlength full exhaust and Injen CAI
I have checked for vaccum leaks and haven't found a single one

Maybe start here:
https://www.cobaltss.net/forums/prob...-p2261-184458/

We have found leaking vacuum tanks causing this dtc. When testing the vacuum tank, care must be used or the results may not be valid. The vacuum tank has an integral check valve not noted in SI. To check the Vacuum Tank operation, disconnect the hose that runs from the tank to the Bypass Valve Solenoid at the solenoid and apply vacuum to the tank. The tank should be able to maintain vacuum with no decay. Note: If you remove the vacuum hose from the intake manifold and plug it and the decay stops the check valve is leaking, if the decay continues the tank itself is leaking.

Know all the parameters are reading fine the l was on 60 over it's not hesitant it's been trod over do y'all smell fuel whenever y'all spend y'all was over repeatedly like a flooding I was going to take the spark plug out and looks but that's what got me in trouble to be