Archives: DTC Codes

What Does Code C1839 Mean? The diagnostic trouble code C1839, commonly defined as a “Leakage Fault,” is a manufacturer-specific chassis code typically indicating an issue within a vehicle’s pneumatic or hydraulic system that is unable to maintain a required pressure. While its exact definition can vary by manufacturer, within the context of many modern vehicles, […]

What Does Code C1840 Mean? Diagnostic Trouble Code (DTC) C1840 signifies a detected malfunction within the Air Suspension Disable Switch Circuit. This circuit is an integral part of the vehicle’s active air suspension system, designed to allow manual deactivation of the system, typically for maintenance procedures, lifting the vehicle on a hoist, or transporting it […]

What Does Code C1841 Mean? DTC C1841 signifies an “Air Suspension Disable Switch Circuit Open” fault detected by the vehicle’s Air Suspension Control Module (ASCM) or Ride Height Control Module (RHCM). This code indicates that the control module is not receiving the expected electrical signal from the air suspension disable switch, or it detects an […]

What Does Code C1842 Mean? DTC C1842 signifies an “Air Suspension Disable Switch Circuit Short To Battery” condition. This diagnostic trouble code is typically set by the Air Suspension Control Module (ASCM) or a related Body Control Module (BCM) when it detects an abnormally high voltage, specifically close to the vehicle’s battery voltage (B+), on […]

What Does Code C1843 Mean? DTC C1843 indicates an electrical fault within the circuit of the air suspension disable switch, specifically detecting a condition where the circuit is continuously shorted to ground. The air suspension disable switch is a critical component, often found in vehicles equipped with pneumatic suspension systems, designed to allow the driver […]

What Does Code C1844 Mean? DTC C1844 indicates an Air Suspension Secondary Front Inflator Solenoid Output Circuit Failure. This code signifies that the Air Suspension Control Module (ASCM), or a dedicated suspension control unit, has detected an electrical fault within the circuit controlling the secondary inflator solenoid for the front air suspension. This particular solenoid […]

What Does Code C1845 Mean? DTC C1845 signifies an “Air Suspension Front Inflator Solenoid Output Circuit Failure.” This diagnostic trouble code is set when the Suspension Control Module (SCM), or in some integrated systems, the Powertrain Control Module (PCM) or Body Control Module (BCM), detects an electrical anomaly in the control circuit for the front […]

What Does Code C1846 Mean? DTC C1846 indicates an Air Suspension Front Inflator Solenoid Output Circuit Open. This chassis (C-body) diagnostic trouble code specifically points to an electrical fault within the circuit controlling the front air spring inflator solenoid. The Suspension Control Module (SCM), sometimes referred to as the Air Suspension Control Module (ASCM), monitors […]

What Does Code C1847 Mean? DTC C1847 indicates a fault within the air suspension system, specifically signaling an Air Suspension Front Inflator Solenoid Output Circuit Short To Battery. This diagnostic trouble code is registered by the vehicle’s Air Suspension Control Module (ASCM) or Suspension Control Module (SCM), which is responsible for managing the ride height […]

What Does Code C1848 Mean? DTC C1848 indicates an electrical fault within the output circuit controlling the front air suspension inflator solenoid. Specifically, the Air Suspension Control Module (ASCM), or an equivalent suspension control unit, has detected a short to ground condition in this critical circuit. This means that the electrical current intended for the […]