Archives: DTC Codes

What Does Code C1776 Mean? DTC C1776, commonly identified as a “Heater System Failure,” is a manufacturer-specific diagnostic trouble code primarily associated with chassis-related systems, particularly the electro-hydraulic braking system. In many modern vehicles, especially hybrids and those equipped with advanced stability control (VSC/ESC) or brake-by-wire technologies, an accumulator or brake booster assembly includes a […]

What Does Code C1777 Mean? The diagnostic trouble code C1777, often described as “Vacuum Pressure Circuit Failure,” indicates that a vehicle’s control module, typically the Powertrain Control Module (PCM), Engine Control Module (ECM), or a Body Control Module (BCM) depending on the system monitored, has detected an electrical malfunction within the circuit of a component […]

What Does Code C1778 Mean? DTC C1778 indicates a detected malfunction within the vehicle’s Electric Power Steering (EPS) system, signaling a general “Power Steering Failure” condition. This code is typically set by the Power Steering Control Module (PSCM), which then reports the fault to the Engine Control Module (ECM) or Powertrain Control Module (PCM) via […]

What Does Code C1779 Mean? DTC C1779 signifies an electrical fault detected within the blower switch circuit, typically indicating a “Blower Switch Failure.” This chassis (C-prefix) diagnostic trouble code is primarily monitored by the Body Control Module (BCM) or a dedicated Heating, Ventilation, and Air Conditioning (HVAC) Control Module, which is responsible for managing the […]

What Does Code C1780 Mean? Diagnostic Trouble Code C1780, interpreted as “Temperature Select Failure,” is a chassis (C-code) specific fault indicating an issue within the vehicle’s Heating, Ventilation, and Air Conditioning (HVAC) system’s ability to accurately interpret or execute a user’s temperature selection. This code is typically set by the HVAC Control Module (HACM) or, […]

What Does Code C1781 Mean? DTC C1781, commonly described as “Engine Coolant Temperature Signal Missing/Fault,” signifies that a vehicle’s control module has detected an anomaly in the signal received from the Engine Coolant Temperature (ECT) sensor. While ‘C’ codes typically pertain to chassis systems, a manufacturer may assign this code to indicate an issue with […]

What Does Code C1790 Mean? Diagnostic Trouble Code C1790 signifies a detected electrical malfunction within the output circuit for the left rear (LR) air spring or shock absorber solenoid. This code is typically registered by the Air Suspension Control Module (ASCM), which is responsible for monitoring and actuating the components of the electronically controlled air […]

What Does Code C1791 Mean? DTC C1791 indicates an “Air Suspension LR Air Spring/Shock Solenoid Output Circuit Open.” This code is set by the Air Suspension Control Module (ASCM), also sometimes referred to as the Suspension Control Module (SCM), which is responsible for monitoring and controlling the vehicle’s air suspension system. Specifically, C1791 signifies that […]

What Does Code C1792 Mean? Diagnostic Trouble Code C1792 signifies a fault within the air suspension system, specifically indicating an Air Suspension LR Air Spring/Shock Solenoid Output Circuit Short To Battery. This code is typically set by the Air Suspension Control Module (ASCM), which is responsible for managing the vehicle’s adaptive or active air suspension […]

What Does Code C1793 Mean? DTC C1793 signifies an electrical fault within the vehicle’s active or semi-active air suspension system, specifically indicating a short to ground in the output circuit for the Left Rear (LR) air spring or shock absorber solenoid. The Air Suspension Control Module (ASCM), also known as the Ride Height Control Module […]