Sometimes you go through all the documented testing steps for a problem and still can’t find the solution. When this happens, turning to your fellow techs is a great solution. SureTrack community member candtauto had a Buick Regal Turbo in the shop with a code P2261 for a stuck turbo bypass valve. They posed the question to the community, and with the help of fellow community member dmckemie12 and others, they were able to resolve the issue quickly.
The following Community Fix summarizes the interaction between members of the community that led to the solution.
Vehicle
2011 Buick Regal CXL Turbo 2.0L
Title
P2261 Turbo Bypass Valve Stuck Closed, replaced vacuum tank.
Complaint
Customer states that check engine light is on.
Diagnostic Steps Performed/Parts Replaced
Checked for codes and found P2261, Turbo Bypass Valve Stuck Closed. Replaced bypass valve and solenoid, smoke test found no leaks. Substituted Good MAF and MAP sensor. The MAP is reading 15 at idle, vacuum gauge reads cold 11 PSI, snap the throttle and it goes to 18. There is no audible sound heard when you snap the throttle, valve appears to be working.
Best Answer from Community Member dmckemie12
The vacuum tank also has an internal check valve, make sure it is working.
Cause
Vacuum tank was the cause.
Correction
Replaced vacuum tank, cleared codes and road tested vehicle. Code did not return.