Archives: DTC Codes

What Does Code P1241 Mean? The diagnostic trouble code P1241 signifies that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an abnormally low voltage input on a specific sensor’s power supply circuit. This typically pertains to a 5-volt or 12-volt reference voltage circuit that is responsible for […]

What Does Code P1242 Mean? DTC P1242 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an abnormally high voltage reading on a specific sensor’s power supply circuit or its signal return line. Unlike typical sensor performance codes, P1242 specifically points towards an issue with the voltage supply to the […]

What Does Code P1243 Mean? DTC P1243 indicates a malfunction within the Fuel Pump Secondary Circuit. In modern vehicles, the Powertrain Control Module (PCM) or Engine Control Module (ECM) regulates fuel pump operation not solely through a relay, but often via a dedicated Fuel Pump Driver Module (FPDM). The FPDM receives a Pulse Width Modulated […]

What Does Code P1244 Mean? DTC P1244 signifies that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an abnormal condition in the alternator load input signal, specifically that it has “failed high.” The ECM relies on this input, typically a voltage signal from the alternator’s integrated voltage […]

What Does Code P1245 Mean? DTC P1245 signifies that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an abnormal voltage condition on the alternator’s dedicated load input or feedback circuit. Specifically, the observed voltage signal is consistently below the ECM’s calibrated lower threshold for acceptable operation. […]

What Does Code P1246 Mean? Diagnostic Trouble Code (DTC) P1246, “Alternator Load Input Failed,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an anomaly or failure within the circuit responsible for monitoring the alternator’s electrical load response or its ability to meet system demands. The ECM/PCM actively manages the […]

What Does Code P1247 Mean? The diagnostic trouble code P1247 signifies “Turbo Boost Pressure Low.” This code is set by the Powertrain Control Module (PCM), or Engine Control Module (ECM) in some vehicle applications, when it detects that the actual boost pressure being generated by the turbocharger or supercharger system is significantly lower than the […]

What Does Code P1248 Mean? DTC P1248, generically defined as “Turbo Boost Pressure Not Detected,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has identified a significant discrepancy between the expected boost pressure and the actual boost pressure measured by the Manifold Absolute Pressure (MAP) sensor or a dedicated Boost Pressure […]

What Does Code P1249 Mean? DTC P1249, often described as “Wastegate Control Valve Performance,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an issue with the operation or effectiveness of the turbocharger wastegate control system. Specifically, the ECM monitors the actual boost pressure, typically via the Manifold Absolute Pressure […]

What Does Code P1250 Mean? DTC P1250 typically signifies a malfunction within the Fuel Pressure Regulator Control (FPRC) Solenoid circuit. This code is often manufacturer-specific, primarily found in Ford and some Mazda vehicles, indicating that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an electrical fault within the circuit responsible for […]