Archives: DTC Codes

What Does Code P0090 Mean? The diagnostic trouble code P0090, “Fuel Pressure Regulator 1 Control Circuit,” indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an electrical malfunction within the control circuit of the primary fuel pressure regulator. In modern common rail direct injection (CRDI) diesel […]

What Does Code P0091 Mean? DTC P0091 indicates a detected issue with the control circuit for Fuel Pressure Regulator 1, specifically signaling a “Low” voltage condition. The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), actively monitors the electrical circuit responsible for controlling the fuel pressure regulator. This regulator, typically a […]

What Does Code P0092 Mean? DTC P0092 indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an electrical fault within the control circuit for Fuel Pressure Regulator 1, specifically an abnormally high voltage condition. This regulator, typically an electronically controlled solenoid or valve, is critical […]

What Does Code P0093 Mean? DTC P0093 signifies “Fuel System Leak Detected – Large Leak.” This code is set by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects a significant and persistent drop in fuel pressure that cannot be attributed to normal system operation or minor fluctuations. The ECM/PCM continuously […]

What Does Code P0094 Mean? DTC P0094 indicates that the Engine Control Module (ECM), also referred to as the Powertrain Control Module (PCM), has detected a small leak within the Evaporative Emission Control (EVAP) system. The EVAP system is designed to prevent fuel vapors from escaping into the atmosphere by capturing them in a charcoal […]

What Does Code P0095 Mean? DTC P0095 indicates an electrical circuit malfunction detected within the Intake Air Temperature (IAT) Sensor 2 circuit. The “2” designation typically refers to a secondary IAT sensor, commonly found in charge air cooler outlet pipes on forced-induction engines (turbocharged or supercharged), or as a separate sensor for bank 2 in […]

What Does Code P0096 Mean? The diagnostic trouble code P0096 signifies “Intake Air Temperature Sensor 2 Circuit Range/Performance.” This code indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an electrical anomaly or an inconsistency in the signal output from Intake Air Temperature (IAT) Sensor 2. […]

What Does Code P0097 Mean? DTC P0097 indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected a voltage signal from the Intake Air Temperature (IAT) Sensor 2 circuit that is below a pre-defined minimum threshold. This typically implies an extremely high resistance or an open circuit […]

What Does Code P0098 Mean? DTC P0098 signifies an issue with the electrical circuit for Intake Air Temperature (IAT) Sensor 2, specifically indicating a “Circuit High” condition. The Engine Control Module (ECM) or Powertrain Control Module (PCM) monitors the voltage signal from IAT Sensor 2 to determine the temperature of the air entering a specific […]

What Does Code P0099 Mean? Diagnostic Trouble Code (DTC) P0099 signifies that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an intermittent or erratic signal from the Intake Air Temperature (IAT) Sensor 2 circuit. Unlike a constant open or short circuit, “intermittent/erratic” implies that the sensor’s signal is fluctuating in an […]