Archives: DTC Codes

What Does Code P1231 Mean? DTC P1231 signifies a fault within the fuel pump secondary circuit, specifically indicating a low voltage or current condition when the Engine Control Module (ECM) or Powertrain Control Module (PCM) commands the fuel pump to operate at a high-speed or high-output state. Modern fuel delivery systems often employ a Fuel […]

What Does Code P1232 Mean? DTC P1232 signifies a malfunction within the primary control circuit responsible for regulating the speed of the fuel pump. In modern vehicles, the Engine Control Module (ECM) or Powertrain Control Module (PCM) does not directly power the fuel pump at a fixed voltage. Instead, it utilizes a dedicated Fuel Pump […]

What Does Code P1233 Mean? The diagnostic trouble code P1233, “Fuel Pump Driver Module Off Line,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has lost communication with the Fuel Pump Driver Module (FPDM). The FPDM is an electronic module responsible for controlling the speed and output pressure of the electric […]

What Does Code P1234 Mean? The diagnostic trouble code P1234 signifies “Fuel Pump Driver Module Off Line.” This code indicates that the Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), has lost communication with the Fuel Pump Driver Module (FPDM). The FPDM is a critical component in modern fuel […]

What Does Code P1235 Mean? DTC P1235 indicates that the Powertrain Control Module (PCM), or in some architectures, a dedicated Fuel Pump Control Module (FPCM), has detected an anomaly in the fuel pump control circuit, specifically that the commanded fuel pump operation is “out of range.” This code signifies a discrepancy between the desired fuel […]

What Does Code P1236 Mean? Diagnostic Trouble Code P1236 signifies that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an anomaly in the fuel pump control circuit, specifically indicating that the “Fuel Pump Control is Out Of Range.” In modern fuel injection systems, the ECM does not simply […]

What Does Code P1237 Mean? The diagnostic trouble code P1237 indicates a malfunction within the Fuel Pump Secondary Circuit. This generic powertrain code signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an abnormal voltage or resistance reading in the circuit responsible for controlling or monitoring the fuel pump’s operation, […]

What Does Code P1238 Mean? DTC P1238 signifies a detected malfunction within the Fuel Pump Secondary Circuit. In contemporary automotive fuel systems, particularly those employing demand-controlled fuel delivery, the Engine Control Module (ECM) or Powertrain Control Module (PCM) utilizes a Fuel Pump Driver Module (FPDM) to modulate the voltage supplied to the fuel pump. This […]

What Does Code P1239 Mean? DTC P1239 signifies a “Speed Fuel Pump Positive Feed Fault,” indicating that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an electrical anomaly in the main positive voltage supply circuit to the fuel pump or its associated control module. In modern vehicles, especially those utilizing a […]

What Does Code P1240 Mean? DTC P1240 signifies a general Sensor Power Supply Malfunction, indicating that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an irregular voltage condition within the power supply circuit of a specific sensor. While the ‘P12xx’ range typically denotes manufacturer-specific powertrain codes, P1240 generally points to an […]