Vehicle: 2011 Buick Regal CXL Turbo 2.0L
Complaint: The customer stated the check engine light was on.
Code: P2261 Turbo Bypass Valve Stuck Closed
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.
Diagnostic Steps Performed/Parts Replaced: The technician checked for codes and found code P2261 for Turbo Bypass Valve Stuck Closed. Replaced bypass valve and solenoid, smoke tested found no leaks. Substituted good MAF and MAP sensor. The MAP was reading 15 at idle and the vacuum gauge reads 11 PSI when cold. If the throttle was snapped, it would go to 18. There was no audible sound heard when the throttle was snapped, and the valve appeared to be working.
Best Answer from Community Member: 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 tested vehicle. The code did not return.
by Nick Taylor