Archives: DTC Codes

What Does Code P0120 Mean? DTC P0120 stands for “Throttle Position Sensor/Switch ‘A’ Circuit Malfunction.” This code indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an electrical anomaly within the circuit of the Throttle Position Sensor (TPS) or, in some modern drive-by-wire systems, the […]

What Does Code P0121 Mean? DTC P0121 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an intermittent or out-of-range signal from the Throttle Position Sensor “A” circuit, specifically concerning its range or performance. The Throttle Position Sensor (TPS) is a potentiometer that converts the mechanical position of the throttle […]

What Does Code P0122 Mean? DTC P0122 signifies that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected a voltage signal from the Throttle Position Sensor “A” circuit that is consistently below its expected operational threshold. The Throttle Position Sensor (TPS) is a critical input sensor that monitors […]

What Does Code P0123 Mean? DTC P0123 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an abnormally high voltage input from the Throttle Position Sensor (TPS) “A” circuit. The TPS is a critical potentiometer-style sensor mounted on the throttle body, responsible for translating the mechanical angle of the throttle […]

What Does Code P0124 Mean? DTC P0124 signifies an intermittent fault within the Throttle Position Sensor/Switch ‘A’ Circuit. The Engine Control Module (ECM) or Powertrain Control Module (PCM) monitors the voltage output from the Throttle Position Sensor (TPS) ‘A’ to determine the throttle plate’s angular position. This sensor is a critical input for the ECM/PCM, […]

What Does Code P0125 Mean? DTC P0125, which stands for “Insufficient Coolant Temperature for Closed Loop Fuel Control” or “ECT Excessive Time to Closed Loop Fuel Control,” signifies that the Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), has detected an abnormally long duration for the engine to reach its optimal […]

What Does Code P0126 Mean? DTC P0126, or “Insufficient Coolant Temperature for Stable Operation,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the engine coolant temperature has not reached the necessary operating temperature within a specified period of time or remains below the optimal threshold during operation. The […]

What Does Code P0128 Mean? DTC P0128 indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected that the engine coolant temperature is not reaching its optimal operating temperature within a specified timeframe, or is consistently operating below the target threshold. The ECM monitors the Engine Coolant Temperature […]

What Does Code P0129 Mean? Diagnostic Trouble Code (DTC) P0129 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an implausibly low signal voltage from the Barometric Pressure (BARO) sensor. The BARO sensor’s primary function is to measure ambient atmospheric pressure, which the ECM utilizes to determine air density. This […]

What Does Code P0130 Mean? DTC P0130 signifies an Oxygen (O2) Sensor Circuit Malfunction (Bank 1 Sensor 1). This diagnostic trouble code indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an electrical fault or an implausible signal within the circuit of the upstream oxygen sensor for […]