Archives: DTC Codes

What Does Code P1396 Mean? DTC P1396 signifies a “Glow Plug Monitor Fault (Bank #2)”. This code is specific to diesel engines, which utilize glow plugs to pre-heat the combustion chambers, facilitating ignition, particularly during cold start conditions. The Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), is responsible […]

What Does Code P1397 Mean? DTC P1397, which translates to “System Voltage Out Of Self Test Range,” indicates that the Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), has detected an anomaly in the electrical system voltage during a specific self-test or monitoring routine. This code does not necessarily […]

What Does Code P1398 Mean? DTC P1398 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a “High Input” condition in the electrical circuit for Variable Valve Timing (VVT) Solenoid “B”. This typically signifies that the voltage signal on the control circuit for VVT Solenoid B is continuously or intermittently […]

What Does Code P1399 Mean? The diagnostic trouble code P1399 signifies a detected anomaly within the Glow Plug Circuit High Side, specifically indicating a High Input condition. In diesel engine applications, glow plugs are essential pre-heating devices that facilitate cold starting by raising the temperature within the combustion chamber. The Engine Control Module (ECM) or […]

What Does Code P1400 Mean? The diagnostic trouble code P1400, “DPFE Circuit Low Input,” indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an abnormally low voltage signal from the Differential Pressure Feedback EGR (DPFE) sensor circuit. The DPFE sensor is a critical component of the Exhaust […]

What Does Code P1401 Mean? DTC P1401 indicates a detected issue within the Differential Pressure Feedback Exhaust Gas Recirculation (DPFE) sensor circuit, specifically a “High Input” condition. The DPFE sensor is a critical component of the Exhaust Gas Recirculation (EGR) system, which is designed to reduce nitrogen oxide (NOx) emissions by recirculating a small portion […]

What Does Code P1402 Mean? DTC P1402 indicates an “EGR Metering Orifice Restricted” condition. This code signifies that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected inadequate or restricted exhaust gas flow through the Exhaust Gas Recirculation (EGR) system’s metering orifice or passages. The ECM monitors EGR system […]

What Does Code P1403 Mean? Diagnostic Trouble Code (DTC) P1403 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an illogical signal from the Differential Pressure Feedback EGR (DPFE) sensor, specifically identifying that the DPFE sensor hoses are reversed. The DPFE sensor is a critical component of the Exhaust Gas […]

What Does Code P1404 Mean? DTC P1404 is commonly defined as “Exhaust Gas Recirculation (EGR) Closed Position Performance” or “EGR Valve Stuck Open,” though some interpretations might also include an “Intake Air Temperature (IAT) – B Circuit Malfunction” depending on the vehicle manufacturer. For the majority of applications, particularly Ford vehicles where this code is […]

What Does Code P1405 Mean? The OBD-II diagnostic trouble code P1405 indicates a detected malfunction within the Differential Pressure Feedback EGR (DPFE) sensor circuit, specifically identifying an issue with the upstream hose connection or integrity. The Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), utilizes the DPFE sensor to […]