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I have a 06 Cobalt SS/SC and after 4 months of having the car I started not having any boost. While idling and lightly accelerating the boost gauge moves through the vacuum section as it should, but once on the throttle the gauge hits zero or slightly below it and stops. There is a difference in the car so it's not the gauge.

I have done some flipping through other threads about the issue and it seemed to be the bypass solenoid. I swapped that out but still no boost. During regular driving the engine doesn't pop any codes, but when driving 'spirited' they come up.

The codes that come up are:

P0033 Supercharger Bypass Valve Solenoid Control Circuit -PCM
P0101 Mass Air Flow (MAF) Sensor Performance - PCM
P0103 Mass Air Flow (MAF) Sensor Circuit High Frequency -PCM
P0171 Fuel Trim System Lean -PCM
P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit -PCM

I disconnected the vacuum hose that runs from the intake manifold to the solenoid and plugged it and went for a ride. The actuator stayed in one position and the boost was back so I'm assuming the actuator is fine. The boost was getting like this only went to about 6psi though.

Since I already replace the solenoid I'm at a loss for what it could be.

Any insight would be greatly appreciated.
 
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