Archives: DTC Codes

What Does Code P1428 Mean? DTC P1428, specifically noted for “EGI Mini – MAF Failed Open Circuit,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an open circuit condition within the Mass Air Flow (MAF) sensor or its associated wiring harness. The MAF sensor is a crucial component of […]

What Does Code P1429 Mean? DTC P1429 signifies an “Electric Air Pump Primary Failure” within the Secondary Air Injection (SAI) system. This code indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an electrical malfunction related to the primary circuit supplying power to the electric air pump. […]

What Does Code P1430 Mean? The diagnostic trouble code P1430 signifies an “Electric Air Pump Secondary Failure” within the vehicle’s Secondary Air Injection (AIR) system. The AIR system is an emissions control component designed to reduce harmful exhaust emissions, particularly during cold start conditions. Its primary function is to pump fresh, ambient air into the […]

What Does Code P1433 Mean? Diagnostic Trouble Code (DTC) P1433 signifies an electrical fault within the A/C Refrigerant Temperature Sensor Circuit, specifically indicating a low voltage condition. The Engine Control Module (ECM) or Powertrain Control Module (PCM), often in conjunction with the HVAC control module, monitors the electrical signal from the A/C refrigerant temperature sensor. […]

What Does Code P1434 Mean? DTC P1434 indicates an issue within the A/C (Air Conditioning) Refrigerant Temperature Sensor circuit, specifically that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an abnormally high voltage signal. The A/C Refrigerant Temperature Sensor is typically a Negative Temperature Coefficient (NTC) thermistor, meaning […]

What Does Code P1435 Mean? DTC P1435 indicates an issue with the A/C Refrigerant Temperature Sensor circuit, specifically registering a reading that is outside of its expected operating range or exhibiting implausible performance. The Engine Control Module (ECM), or Powertrain Control Module (PCM), monitors the electrical signal from the A/C Refrigerant Temperature Sensor to assess […]

What Does Code P1436 Mean? DTC P1436 signifies an issue within the A/C Evaporator Air Temperature Sensor circuit, specifically indicating a “Circuit Low” condition. The A/C Evaporator Air Temperature Sensor, often a Negative Temperature Coefficient (NTC) thermistor, plays a critical role in the climate control system by monitoring the temperature of the air leaving the […]

What Does Code P1437 Mean? Diagnostic Trouble Code P1437 signifies an issue within the A/C Evaporator Air Temperature Sensor circuit, specifically indicating a “Circuit High” condition. This code is set by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects a voltage reading from the Evaporator Air Temperature Sensor (EATS) that […]

What Does Code P1438 Mean? DTC P1438 signifies a detected fault within the A/C Evaporator Air Temperature Circuit, indicating a “Range/Performance” issue. The Engine Control Module (ECM) or Powertrain Control Module (PCM) monitors the resistance of a thermistor-type sensor positioned within or near the evaporator core, which provides a voltage signal proportional to the evaporator’s […]

What Does Code P1439 Mean? DTC P1439 indicates a detected malfunction within the circuit for the Floor Temperature Switch or Sensor. This code is a generic powertrain code, meaning it is applicable to all OBD-II equipped vehicles, though the specific diagnostic strategies and the exact component nomenclature may vary by manufacturer. The Floor Temperature Switch/Sensor […]