Code Definition

C1865 — Air Suspension Rear Inflator Solenoid Output Circuit Failure

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1865

C1865 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1865 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1865 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The air suspension system uses electrically operated solenoid valves to control the flow of compressed air into and out of the air springs to set ride height. DTC C1865 relates to the rear inflator solenoid, which the air suspension control module commands through a driver output circuit to admit air and raise the rear of the vehicle. This code sets when the module detects a failure in that output circuit, such as an open, a short to ground, a short to voltage, or an out of range current that does not match the commanded state of the solenoid. When this code is set, the system may be unable to...

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