Code Definition

C1918 — Air Suspension Ride Height Select Switch Circuit Failure

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

About C1918

C1918 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 C1918 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.

C1918 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 driver and automatic inputs to control vehicle ride height through air springs supplied by an onboard compressor. The ride height select switch lets the driver choose a height mode, such as normal or raised for rough terrain, and feeds that request to the air suspension control module. DTC C1918 is set when the module detects a failure in the ride height select switch circuit, such as an open, a short, or an implausible signal that does not correspond to a valid switch position. This can result from switch contact failure, wiring damage, or connector corrosion. W...

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