The PCM closely observes boost pressure with a sensor called the manifold absolute pressure sensor (MAP). The boost pressure sensor tells the PCM how much boost is actually being created by the turbocharger. When boost pressure is high the voltage signal is high. When boost pressure is low the voltage is low. After numerous RAC call outs it was established to be a air leak into the low pressure side of the fuel system. After a sneeky interrogation of the local ford workshop manager, he suggested to 'start' with a new diesel filter housing. In my case this fixed the long ongoing issue. Quote. 3.6k. One day I opened the hood of the car and told somebody to press on the accelerator, i noticed that the actuator was not moving, so i decided to zip tie a sam Hello you tube! why look so down?. What? your turbos gone up the swanny???garage going to cost you an arm and leg to fix???watch this and save mega ££££££ P0045 is a diagnostic trouble code (DTC) for "Turbo/Super Charger Boost Control Solenoid Circuit/Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. Trouble code P0234 indicates the powertrain control module (PCM) senses a dangerously high boost pressure I got lumbered with a Ford Focus 1.6 TDCi today, the customer complaint was that the engine is seriously holding back and will not accelerate over 40 MPH. Difficult one today because I had no scanner to check live data or fault codes, so I asked the boss to check it using his scanner. dlGsn.