Archives: DTC Codes

What Does Code P1494 Mean? The diagnostic trouble code P1494, labeled as “SPCUT Solenoid Circuit Malfunction,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an electrical fault within the circuit controlling a specific solenoid designated as the “SPCUT” solenoid. While “SPCUT” is a manufacturer-specific acronym, for many vehicle makes, […]

What Does Code P1495 Mean? DTC P1495 signifies a detected malfunction within the electrical circuit of the TCSPL Solenoid. While the specific acronym “TCSPL” can be manufacturer-specific, it generally refers to a solenoid responsible for managing or responding to “System Pressure Low” conditions within a vehicle’s auxiliary or emission control systems. Common interpretations for P1495 […]

What Does Code P1500 Mean? DTC P1500 signifies an intermittent fault within the Vehicle Speed Sensor (VSS) circuit or the VSS component itself. The Powertrain Control Module (PCM), also referred to as the Engine Control Module (ECM), relies on the VSS to provide accurate vehicle speed data. This data is critical for a multitude of […]

What Does Code P1501 Mean? DTC P1501 signifies “Vehicle Speed Sensor Out Of Self Test Range.” This diagnostic trouble code indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an anomaly with the Vehicle Speed Sensor (VSS) signal during its internal diagnostic self-test routines. The PCM conducts specific self-tests, often […]

What Does Code P1502 Mean? DTC P1502 signifies an Intermittent Malfunction within the Vehicle Speed Sensor (VSS) circuit. This code is typically manufacturer-specific, as P15xx codes generally fall within the proprietary range, but for systems utilizing generic OBD-II definitions, it points to an inconsistent or erratic VSS signal. The Powertrain Control Module (PCM), or Engine […]

What Does Code P1503 Mean? The diagnostic trouble code P1503 indicates an issue within the circuit of the Auxiliary Speed Sensor. This code is generated by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects a signal from this sensor that is either erratic, out of the expected voltage or frequency […]

What Does Code P1504 Mean? DTC P1504 signifies an detected electrical malfunction within the Idle Air Control (IAC) valve circuit. The Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), utilizes the IAC valve to precisely regulate the amount of air bypassing the throttle plate, thereby maintaining the engine’s target […]

What Does Code P1505 Mean? The diagnostic trouble code P1505, “Idle Air Control System At Adaptive Clip,” signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an issue with the vehicle’s Idle Air Control (IAC) system. The ECM/PCM utilizes the IAC valve to precisely regulate the amount of air bypassing […]

What Does Code P1506 Mean? DTC P1506, categorized as an “Idle Air Control (IAC) Overspeed Error,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an engine idle speed significantly higher than its calculated target RPM while the Idle Air Control (IAC) system is attempting to regulate airflow. The IAC […]

What Does Code P1507 Mean? DTC P1507 signifies an “Idle Air Control Underspeed Error.” This code indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected that the engine’s actual idle speed is significantly lower than its commanded or desired idle speed. The Idle Air Control […]