Diesel Diagnostics

The P0101 Mass Air Flow Sensor Code and Turbocharger relationship is one of the most misunderstood diagnostic situations we see come through the shop, and chasing the wrong part costs owner-operators real money and downtime. P0101 is a MAF sensor performance code, but on a turbocharged diesel or gas engine, the sensor rarely fails in

The P2564 Turbocharger Boost Control Position Sensor Low code sets when your ECM detects a voltage signal from the turbo boost control position sensor that falls below the expected calibrated range. In plain terms, the sensor that tells the computer where your turbo’s actuator or wastegate arm is sitting has dropped its signal to a

The P2263 Turbo Boost System Performance Code is one of the more frustrating diagnostic trouble codes a diesel tech can face because it points to a performance problem, not a hard failure. The ECM isn’t telling you a sensor is disconnected or a wire is grounded. It’s telling you the boost the turbo is actually

The P0243 Turbocharger Wastegate Solenoid A Malfunction code is one of the most misdiagnosed boost-control faults we see come through our shop, and too often the truck ends up with a replaced turbo it never needed. This code points to an electrical or control problem in the wastegate boost-control solenoid circuit, not necessarily a blown

The P0045 Turbocharger Boost Control Solenoid Circuit Open code is one of the most common boost-related faults we see come through the shop, and it trips up plenty of experienced techs because the name points you in the wrong direction. This is not a mechanical turbo failure code. It is an electrical circuit fault telling

A boost leak can mimic turbocharger failure and cause the same codes and symptoms. Before replacing your turbo, spend 20 minutes pressure testing the charge piping.