Archives: DTC Codes

What Does Code P0433 Mean? DTC P0433 signifies that the Powertrain Control Module (PCM), also referred to as the Engine Control Module (ECM), has detected that the efficiency of the Bank 2 catalytic converter has fallen below a predetermined operational threshold. The term “Heated Catalyst” generally refers to the catalyst’s ability to achieve and maintain […]

What Does Code P0434 Mean? The diagnostic trouble code P0434 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the temperature of the heated catalytic converter on Bank 2 is operating below its specified operational threshold. This indicates that the catalyst is not reaching its optimal operating temperature within […]

What Does Code P0436 Mean? DTC P0436 signifies an issue with the Catalyst Temperature Sensor Circuit Range/Performance on Bank 2. This code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a signal from the Bank 2 catalyst temperature sensor that is implausible, out of its expected operational range, or […]

What Does Code P0437 Mean? DTC P0437 signifies a detected “low input” condition from the catalyst temperature sensor for Bank 2 of the engine. Bank 2 refers to the engine bank that does not contain cylinder #1 (e.g., typically the driver’s side bank on a V6/V8 engine in most longitudinally mounted applications). The Engine Control […]

What Does Code P0438 Mean? DTC P0438 indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an abnormally high voltage input from the Catalyst Temperature Sensor on Bank 2. The catalyst temperature sensor is a critical component within the exhaust system, typically a Negative Temperature Coefficient (NTC) […]

What Does Code P0440 Mean? DTC P0440 signifies a detected Evaporative Emission Control System Malfunction. The Evaporative Emission (EVAP) system is designed to prevent fuel vapors from escaping into the atmosphere. The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), continuously monitors the integrity of this system. For P0440, the ECM […]

What Does Code P0441 Mean? The diagnostic trouble code P0441, “Evaporative Emission Control System Incorrect Purge Flow,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an issue with the regulated flow of fuel vapor from the EVAP canister to the engine intake manifold. The Evaporative Emission Control (EVAP) system […]

What Does Code P0442 Mean? DTC P0442 signifies an “Evaporative Emission Control System Leak Detected (small leak).” This code is set by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), when it detects a small leak within the vehicle’s Evaporative Emission (EVAP) control system. The EVAP system is designed to […]

What Does Code P0443 Mean? DTC P0443 signifies an Evaporative Emission Control System Purge Control Valve Circuit Malfunction. This code is set by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), when it detects an electrical fault within the control circuit of the EVAP purge control valve. The EVAP system […]

What Does Code P0444 Mean? DTC P0444 signifies an “Evaporative Emission Control System Purge Control Valve Circuit Open” condition. This code is set by the Powertrain Control Module (PCM), often referred to as the Engine Control Module (ECM), when it detects an electrical discontinuity or abnormally high resistance within the electrical circuit of the EVAP […]