Archives: DTC Codes

What Does Code P0131 Mean? DTC P0131 signifies a detected condition of O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1). This indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), is receiving a voltage signal from the upstream oxygen sensor (pre-catalytic converter) on engine bank 1 […]

What Does Code P0132 Mean? DTC P0132 indicates that the Engine Control Module (ECM), also referred to as the Powertrain Control Module (PCM), has detected an abnormally high voltage signal emanating from the Bank 1 Sensor 1 oxygen (O2) sensor circuit. Bank 1 designates the engine side containing cylinder #1, and Sensor 1 refers to […]

What Does Code P0133 Mean? DTC P0133 signifies “O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)”. This code is registered by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when the upstream oxygen sensor on Bank 1 (the side of the engine containing cylinder #1) takes an abnormally long time to transition […]

What Does Code P0134 Mean? DTC P0134 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected no discernable activity or switching in the circuit for the upstream oxygen sensor (O2S) on Bank 1. Bank 1 refers to the side of the engine that contains cylinder #1, and Sensor 1 designates […]

What Does Code P0135 Mean? DTC P0135 indicates a malfunction within the heater circuit for the upstream oxygen sensor (O2S) on Bank 1 Sensor 1. Bank 1 refers to the engine bank containing cylinder number one, and Sensor 1 denotes the sensor located before the catalytic converter (pre-cat). Modern zirconia or titania oxygen sensors require […]

What Does Code P0136 Mean? DTC P0136 signifies a malfunction within the electrical circuit of the Bank 1 Sensor 2 oxygen sensor. Bank 1 refers to the engine bank that contains cylinder number one, and Sensor 2 denotes the downstream oxygen sensor, which is located after the catalytic converter. The primary function of the downstream […]

What Does Code P0137 Mean? Diagnostic Trouble Code P0137 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a persistently low voltage signal from the Bank 1 Sensor 2 oxygen sensor circuit. Bank 1 refers to the engine bank that contains cylinder number one, and Sensor 2 designates the downstream […]

What Does Code P0138 Mean? DTC P0138 signifies an O2 Sensor Circuit High Voltage (Bank 1 Sensor 2). This diagnostic trouble code indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an electrical signal from the downstream oxygen sensor on Bank 1 that is consistently above […]

What Does Code P0139 Mean? The diagnostic trouble code P0139 signifies “O2 Sensor Circuit Slow Response (Bank 1 Sensor 2).” This code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the downstream oxygen sensor (Sensor 2) on Bank 1 is responding too slowly to changes in the exhaust […]

What Does Code P0140 Mean? The diagnostic trouble code P0140 signifies “O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)”. This code indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an absence of expected voltage fluctuations or a completely static voltage signal from the downstream […]