Archives: DTC Codes

What Does Code B1231 Mean? DTC B1231, indicating “Longitudinal Acceleration Threshold Exceeded,” signifies that a critical control module, typically the Vehicle Stability Control Module (VSCM), Airbag Control Module (ACM), or Body Control Module (BCM), has received an implausible or out-of-range signal from the longitudinal accelerometer sensor. This sensor is responsible for measuring acceleration and deceleration […]

What Does Code B1232 Mean? DTC B1232 is a manufacturer-specific diagnostic trouble code typically indicating an Interior Air Temperature Sensor Circuit Malfunction within the vehicle’s automatic climate control system. While specific definitions may vary slightly by manufacturer (e.g., Ford, Nissan, Toyota, GM often utilize this range for HVAC or body-related sensor issues), the common interpretation […]

What Does Code B1233 Mean? DTC B1233 indicates a malfunction within the glass break sensor circuit, as detected by the Body Control Module (BCM) or a dedicated Security Control Module (SCM) or Anti-Theft Control Module (ATCM). This code is manufacturer-specific and typically points to an electrical fault within the sensor itself or its associated wiring. […]

What Does Code B1234 Mean? Diagnostic Trouble Code B1234, commonly described as “Mirror Switch Invalid Code,” indicates that the vehicle’s Body Control Module (BCM) or Door Control Module (DCM) has detected an anomalous or unrecognized electrical signal input from the power mirror control switch assembly. This code specifically points to a logical or electrical discrepancy […]

What Does Code B1235 Mean? DTC B1235 signifies a “Window Feedback Failure” and is typically set by the Body Control Module (BCM) or a dedicated Door Control Module (DCM). This code indicates that the control module responsible for the power window system has detected an inconsistency or absence of a feedback signal from a specific […]

What Does Code B1236 Mean? DTC B1236, commonly defined as “Window Feedback Loss of Signal,” indicates that a specific power window control module has lost communication or an expected feedback signal from a power window motor assembly. This diagnostic trouble code primarily pertains to the Body Control Module (BCM), a dedicated Door Control Module (DCM), […]

What Does Code B1237 Mean? DTC B1237, typically defined as “Window Feedback Out of Range,” indicates that a vehicle’s Door Control Module (DCM) or Body Control Module (BCM) has detected an anomalous signal from the power window motor’s integrated position feedback sensor. This sensor, often a Hall effect sensor or rotary encoder, is designed to […]

What Does Code B1238 Mean? DTC B1238 signifies an “Over Temperature Fault” detected within a specific subsystem, typically monitored by the Body Control Module (BCM) or a dedicated sub-module such as the Heating, Ventilation, and Air Conditioning (HVAC) Control Module. This is a manufacturer-specific code, but its common interpretation points to an input from a […]

What Does Code B1239 Mean? DTC B1239 signifies an “Air Flow Blend Door Driver Circuit Failure” within the vehicle’s Heating, Ventilation, and Air Conditioning (HVAC) system. This code is typically set by the HVAC Control Module, which may be a standalone unit, integrated into the Body Control Module (BCM), or sometimes directly managed by the […]

What Does Code B1240 Mean? Diagnostic Trouble Code (DTC) B1240 indicates a specific electrical fault within the control circuit for the rear wiper washer pump relay. This code is typically categorized as a ‘B’ (Body) code, meaning it originates from a module responsible for chassis or body electrical functions, commonly the Body Control Module (BCM), […]