Video tutorial on how to replace the turbo control valve on a Volvo C30 T5. The same procedure can also be found on the Volvo S40, V50, and C70 models from the same generation, this is a 2007 model. This car will also be getting a TCV upgrade thanks to IPDUSA. I am using IPD’s heavy duty turbo control valve for the P1 cars. A faulty turbo control valve will experience an increased fuel economy, a loss in high rpm power, over boosting in lower rpm which increases power, an irregular power band, and in a severe situation will be a check engine light and limp mode, meaning no turbo operation at while.