Archives: DTC Codes

What Does Code B1271 Mean? DTC B1271 indicates a detected electrical fault within the defrost mode door servo motor potentiometer circuit, specifically a short to ground. In modern automotive HVAC (Heating, Ventilation, and Air Conditioning) systems, blend doors and mode doors are precisely controlled by electric servo motors, often referred to as actuators. These actuators […]

What Does Code B1272 Mean? Diagnostic Trouble Code (DTC) B1272 indicates a circuit failure within the servo motor potentiometer for a vent door actuator in the vehicle’s Heating, Ventilation, and Air Conditioning (HVAC) system. Modern HVAC systems utilize electric servo motors, often referred to as actuators, to precisely control the position of various air blend […]

What Does Code B1273 Mean? DTC B1273 signifies an electrical fault within the potentiometer feedback circuit of a servo motor responsible for controlling an HVAC air distribution or blend door. Specifically, “Servo Motor Potentiometer Vent Circuit Open” indicates that the HVAC control module (or Body Control Module, BCM, depending on vehicle architecture) is not receiving […]

What Does Code B1274 Mean? DTC B1274 signifies a detected electrical fault within the control circuit of the HVAC system’s vent mode door servo motor potentiometer. Specifically, the vehicle’s Body Control Module (BCM) or dedicated HVAC Control Module has identified a “Short To Battery” condition on the feedback circuit from the potentiometer integrated within the […]

What Does Code B1275 Mean? Diagnostic Trouble Code B1275 indicates a detected electrical fault within the ventilation mode door servo motor potentiometer circuit, specifically a short to ground. In most modern vehicle HVAC (Heating, Ventilation, and Air Conditioning) systems, electric servo motors are employed to control the precise position of various air distribution doors, such […]

What Does Code B1276 Mean? DTC B1276 indicates a detected fault within the “Foot Circuit” of a servo motor’s integrated potentiometer. In automotive diagnostic terminology, a “B” code signifies a Body Electrical System fault, which commonly pertains to components within the cabin, lighting, HVAC, or accessory systems. A servo motor, in this context, is an […]

What Does Code B1277 Mean? DTC B1277, “Servo Motor Potentiometer Foot Circuit Open,” is a manufacturer-specific Body (B) code indicating an open circuit condition detected within the potentiometric feedback circuit of a specific servo motor. This code is typically set by the Body Control Module (BCM) or a dedicated control module, such as the HVAC […]

What Does Code B1278 Mean? DTC B1278 signifies an electrical fault within the “foot circuit” of a servo motor’s integrated potentiometer, specifically indicating a short to battery voltage. In automotive electrical nomenclature, a “foot circuit” typically refers to the low-reference or signal return line of a sensor. A potentiometer, commonly employed in servo motors (e.g., […]

What Does Code B1279 Mean? DTC B1279 indicates a malfunction within the circuit of a servo motor’s integrated potentiometer, specifically identifying a “foot circuit” short to ground. In automotive HVAC systems, servo motors are electromechanical actuators responsible for positioning blend doors (controlling air temperature) or mode doors (controlling air distribution to vents like defrost, face, […]

What Does Code B1280 Mean? DTC B1280 indicates a circuit failure within the servo motor potentiometer assembly responsible for controlling the “cool air” blend door in the vehicle’s Heating, Ventilation, and Air Conditioning (HVAC) system. This code is typically set by the HVAC Control Module (also known as the A/C Amplifier, Climate Control Module, or […]