Archives: DTC Codes

What Does Code P0400 Mean? DTC P0400 signifies an “Exhaust Gas Recirculation Flow Malfunction,” indicating that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an inconsistency in the expected flow of exhaust gases through the Exhaust Gas Recirculation (EGR) system. The EGR system is critical for […]

What Does Code P0401 Mean? DTC P0401 signifies that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected insufficient flow within the Exhaust Gas Recirculation (EGR) system. The EGR system’s primary function is to reintroduce a metered amount of inert exhaust gas into the engine’s intake manifold. This […]

What Does Code P0402 Mean? DTC P0402 signifies “Exhaust Gas Recirculation Flow Excessive Detected.” This code is triggered by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects a greater-than-expected flow of exhaust gases through the Exhaust Gas Recirculation (EGR) system into the intake manifold, or a persistent flow when no […]

What Does Code P0403 Mean? DTC P0403 signifies an detected electrical malfunction within the Exhaust Gas Recirculation (EGR) control circuit. The Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), continuously monitors the electrical integrity and operational characteristics of the EGR system. The primary function of the EGR system is to […]

What Does Code P0404 Mean? The diagnostic trouble code P0404 signifies an issue within the Exhaust Gas Recirculation (EGR) circuit’s range or performance. This code is set by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), when it detects that the EGR valve’s actual position feedback signal does not correlate […]

What Does Code P0405 Mean? The diagnostic trouble code P0405 indicates an issue within the Exhaust Gas Recirculation (EGR) Sensor A circuit, specifically a “Circuit Low” condition. The Engine Control Module (ECM) or Powertrain Control Module (PCM) utilizes the EGR system to reintroduce a metered amount of exhaust gases into the engine’s intake manifold under […]

What Does Code P0406 Mean? DTC P0406 indicates an issue within the Exhaust Gas Recirculation (EGR) Sensor A circuit, specifically detecting a signal voltage that is consistently higher than the expected operating range or a constant maximum voltage output. The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), monitors the voltage […]

What Does Code P0407 Mean? DTC P0407 signifies an issue with the Exhaust Gas Recirculation (EGR) Sensor B Circuit Low. This code is set by the Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), when it detects a voltage signal from the EGR position sensor (identified as “Sensor B” […]

What Does Code P0408 Mean? The diagnostic trouble code P0408, “Exhaust Gas Recirculation Sensor B Circuit High,” signifies that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an electrical signal voltage from the Exhaust Gas Recirculation (EGR) position sensor ‘B’ that is above the manufacturer’s specified maximum operating […]

What Does Code P0410 Mean? DTC P0410 signifies a detected malfunction within the Secondary Air Injection (SAI) system. This code is triggered by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it identifies that the SAI system is not operating as expected. The SAI system’s primary function is to inject fresh, ambient […]