Archives: DTC Codes

What Does Code B1251 Mean? DTC B1251 indicates an “Air Temperature Internal Sensor Circuit Open.” This code signifies that a control module, typically the Heating, Ventilation, and Air Conditioning (HVAC) control module or sometimes the Body Control Module (BCM), has detected an open circuit condition in the electrical pathway of an internal air temperature sensor. […]

What Does Code B1252 Mean? DTC B1252 signifies an electrical fault within the circuit of an Air Temperature Internal Sensor, specifically indicating a “Short To Battery”. The “B” prefix denotes that this is typically a Body, Chassis, Network, or Auxiliary diagnostic trouble code, often managed by the Body Control Module (BCM), HVAC Control Module, or […]

What Does Code B1253 Mean? DTC B1253 indicates an issue with the Air Temperature Internal Sensor Circuit, specifically a short to ground. This code is typically associated with the vehicle’s Body Control Module (BCM) or the HVAC (Heating, Ventilation, and Air Conditioning) Control Module, as it falls under the ‘B’ category of OBD-II codes (Body […]

What Does Code B1254 Mean? DTC B1254 indicates a circuit malfunction within the Ambient Air Temperature (AAT) sensor system. This sensor, typically a Negative Temperature Coefficient (NTC) thermistor, provides real-time atmospheric temperature data to various vehicle control modules. Depending on the vehicle’s architecture, this data may be utilized by the Body Control Module (BCM), Climate […]

What Does Code B1255 Mean? DTC B1255 signifies an “Air Temperature External Sensor Circuit Open” condition. This fault indicates that the Body Control Module (BCM), Powertrain Control Module (PCM), or dedicated HVAC control module has detected an electrical open circuit within the external ambient air temperature sensor’s wiring or the sensor itself. The external air […]

What Does Code B1256 Mean? DTC B1256 indicates an “Air Temperature External Sensor Circuit Short To Battery.” This diagnostic trouble code typically refers to a fault within the Ambient Air Temperature (AAT) sensor circuit, sometimes also known as the Outside Air Temperature (OAT) sensor. The AAT sensor is a thermistor that changes its internal resistance […]

What Does Code B1257 Mean? The diagnostic trouble code B1257 signifies an electrical fault indicating an Air Temperature External Sensor Circuit Short To Ground. This code is typically set when the Powertrain Control Module (PCM), Body Control Module (BCM), or HVAC control module detects an implausibly low voltage signal from the Ambient Air Temperature (AAT) […]

What Does Code B1258 Mean? DTC B1258 signifies a malfunction within the solar radiation sensor circuit. This code is typically set by the vehicle’s Body Control Module (BCM), Heating, Ventilation, and Air Conditioning (HVAC) control module, or sometimes the Powertrain Control Module (PCM) if it integrates body control functions. The solar radiation sensor, also known […]

What Does Code B1259 Mean? DTC B1259 indicates a detected open circuit within the solar radiation sensor’s electrical pathway. The solar radiation sensor, often referred to as a sunload sensor or ambient light sensor, is a critical input device for the vehicle’s automatic climate control system, primarily the HVAC Control Module or A/C Amplifier. This […]

What Does Code B1260 Mean? The diagnostic trouble code B1260 indicates a specific electrical fault within the solar radiation sensor circuit, specifically a “Short To Battery” condition. The solar radiation sensor, often referred to as a sunload sensor or ambient light sensor, is a critical component of a vehicle’s automatic climate control system. Its primary […]