Code Definition

C1929 — Air Suspension Front Compressor Relay Circuit Failure

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

About C1929

C1929 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 C1929 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.

C1929 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 an electric compressor to supply air to the air springs or struts, maintaining vehicle ride height. The compressor motor is energized through a relay commanded by the air suspension control module. DTC C1929 is set when the control module detects a fault in the front compressor relay control circuit, such as an open, short, or incorrect feedback on the relay coil or its control wiring. The relay switches battery voltage to the compressor motor when ride height correction is required. When this code is set, the compressor may fail to run, leading to low or sagging...

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