Archives: DTC Codes

What Does Code P1251 Mean? DTC P1251 indicates an electrical circuit malfunction within the Air Mixture Solenoid system. The Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), is responsible for monitoring the operational integrity of various emission and engine performance control components. In systems where an “Air Mixture Solenoid” […]

What Does Code P1252 Mean? DTC P1252 signifies an identified anomaly within the Accelerator Pedal Position (APP) sensor circuit, specifically indicating a “Pedal Correlation PDS1 and LPDS High” condition. In modern drive-by-wire systems, the Engine Control Module (ECM) or Powertrain Control Module (PCM) relies on multiple, redundant APP sensor signals to accurately determine driver throttle […]

What Does Code P1253 Mean? DTC P1253 signifies a detected fault in the Accelerator Pedal Position (APP) sensor circuit, specifically indicating a correlation error where both the PDS1 (Pedal Position Sensor 1) signal and the LPDS (Low Pedal Position Sensor, often a secondary track or dedicated low-end signal within the APP assembly) report a voltage […]

What Does Code P1254 Mean? DTC P1254 indicates a specific fault within the Accelerator Pedal Position (APP) sensor system, specifically related to the correlation between two of its internal signal circuits, often designated as PDS2 and LPDS (Linear Pedal Position Sensor, or sometimes a redundant digital signal circuit). The “High” suffix signifies that the voltage […]

What Does Code P1255 Mean? The diagnostic trouble code P1255 indicates a detected fault within the Accelerator Pedal Position (APP) sensor circuit, specifically identifying that both the Pedal Demand Sensor 2 (PDS2) and Low Pedal Demand Sensor (LPDS) signals are registering below their calibrated minimum voltage thresholds. In modern drive-by-wire vehicles, the APP sensor assembly […]

What Does Code P1256 Mean? DTC P1256 signifies a detected correlation error between the primary and secondary Accelerator Pedal Position Sensor (APPS) circuits, often designated as PDS1 and HPDS (High Pedal Position Sensor or a variant of a secondary pedal data signal). The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), […]

What Does Code P1257 Mean? The diagnostic trouble code (DTC) P1257 signifies an detected out-of-correlation condition between the output signals of two or more critical accelerator pedal position sensors, specifically referenced as PDS2 and HPDS (High Pedal Position Sensor or equivalent redundant sensor) in certain automotive systems. In modern drive-by-wire (throttle-by-wire) vehicles, the Engine Control […]

What Does Code P1258 Mean? The diagnostic trouble code P1258 signifies an out-of-correlation condition detected by the Engine Control Module (ECM) or Powertrain Control Module (PCM) between two critical Accelerator Pedal Position (APP) sensor signals, commonly referred to as Pedal Demand Sensor 1 (PDS1 or APP1) and Pedal Demand Sensor 2 (PDS2 or APP2). Modern […]

What Does Code P1259 Mean? DTC P1259 indicates a detected fault within the vehicle’s immobilizer system, specifically an error in the signal communication between the immobilizer control unit and the Powertrain Control Module (PCM), also known as the Engine Control Module (ECM) on some platforms. The immobilizer system is a critical security feature designed to […]

What Does Code P1260 Mean? DTC P1260, indicating “THEFT Detected, Vehicle Immobilized,” signifies that the vehicle’s anti-theft or immobilizer system has detected an unauthorized attempt to operate the vehicle or a critical malfunction within its security components. The Powertrain Control Module (PCM), often in conjunction with a dedicated Immobilizer Control Module (ICM), monitors signals from […]